00-20-2 Chapter 4

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Questions and Answers

What is the primary purpose of using coded information in the MDD process?

To increase the complexity of maintenance tasks

To limit access to maintenance information

To standardize repair procedures across all equipment

To enhance data retrieval and reporting (correct)

How are recommended changes to codes processed according to the content?

Through a verbal agreement with the maintenance supervisor

In accordance with the Recommended Change process in TO 00-5-1 (correct)

By submitting requests to the local maintenance office

By notifying the equipment manufacturer directly

What additional role does narrative information play in relation to coded data in MDD?

It replaces the need for coded data entirely

It restricts access to maintenance management information

It eliminates the requirement for maintenance procedures

It serves as a supplementary explanation for coded data (correct)

What is the authority for approving changes to Work Unit Codes below the system level?

The TO OPR has final approval authority (D) Signup and view all the answers

Which document outlines the specific rules for documenting codes and entries?

Chapter 7 of the referenced content (D) Signup and view all the answers

What is required to submit a change request for a Work Unit Code?

A complete evaluation from the PM TO OPR (A) Signup and view all the answers

What defines the specific system-level Work Unit Code prefixes?

The equipment type as defined in MIL-DTL-38769 (B) Signup and view all the answers

What must be avoided in narrative information within the maintenance management information systems?

Classified data that is sensitive in nature (D) Signup and view all the answers

What should be done if a serial number exceeds the maximum permitted length?

Use only the last 10 or 15 characters. (B) Signup and view all the answers

What is the proper action when documenting discrepancy information?

Describe the problem in detail. (D) Signup and view all the answers

Which of the following is NOT a requirement for entering the AFTO Form 350 tag number?

It should include classified information. (A) Signup and view all the answers

Which of the following is NOT considered part of the corrective action narrative?

Providing no information about actions taken. (B) Signup and view all the answers

What kind of items should be documented in Bit & Piece reporting during maintenance?

Non-reparable and non-recoverable items. (C) Signup and view all the answers

Which of the following is important to include in the previous operating time entry?

The reading of the Elapsed Time Indicator. (C) Signup and view all the answers

What should be included when entering the part number of an installed item?

The lot number if applicable. (A) Signup and view all the answers

If a maintenance action needs to be placed on hold, which statement is acceptable in the corrective action narrative?

Repair in progress. (C) Signup and view all the answers

What should be done if an item was bench checked but found to be non-serviceable?

Document this in the corrective action narrative. (C) Signup and view all the answers

What is the maximum allowed length for most serial numbers?

10 characters. (A) Signup and view all the answers

Which of the following actions should NOT be included when documenting corrective actions?

Adjusting normal wear and tear. (A) Signup and view all the answers

Which information is NOT necessary for input in the operating time section?

The model number of the equipment. (D) Signup and view all the answers

What is a correct approach to documenting unsuccessful inspections of an item?

Document as 'could not duplicate write-up.' (B) Signup and view all the answers

Which of the following is an acceptable Action Taken Code for on-equipment maintenance?

A - Adjusted. (D) Signup and view all the answers

What type of ID number will be assigned to non-registered special equipment selected by base management?

Individual ID numbers by serial number (D) Signup and view all the answers

Which of the following special equipment items would require an ID number based on the outlined procedures?

End items with an assigned SRD (C) Signup and view all the answers

When should grouped ID numbers be assigned?

To SE not requiring detailed MDD data (A) Signup and view all the answers

Which scenario does not require the assignment of ID numbers?

Transient aircraft and missile transporters (A) Signup and view all the answers

What character indicates an ID number assigned to end items containing a TMDE component?

B, G, or H (A) Signup and view all the answers

What is the primary responsibility of the owning workcenter?

Maintain custodial and maintenance responsibility for specific equipment (D) Signup and view all the answers

What is true regarding the ID numbers for equipment that may be rotated to other locations?

They can be retained with probability of return. (D) Signup and view all the answers

Which type of workcenter is primarily responsible for executing maintenance tasks?

Performing workcenter (B) Signup and view all the answers

What procedure is used for documenting maintenance actions when no ID number has been assigned?

A command code requires entry. (B) Signup and view all the answers

How is the federal stock classification code represented?

First four digits of the National Stock Number (B) Signup and view all the answers

In which scenario would a reporting workcenter not need to provide maintenance personnel assignments?

When the workcenter's maintenance actions are exempted (A) Signup and view all the answers

What characterizes a non-reporting workcenter?

They may expend man-hours but have no assigned personnel. (A) Signup and view all the answers

Which of the following items is exempt from needing an ID number?

Handtools frequently used within a base (C) Signup and view all the answers

For entries concerning maintenance by outside teams, which code is utilized?

Depot workcenter code (B) Signup and view all the answers

What is the maximum character limit for an equipment part number?

15 characters (B) Signup and view all the answers

When is an ID number interpreted by a computer routine into the owning workcenter?

For both on-equipment and off-equipment work (D) Signup and view all the answers

What type of equipment is specifically mentioned to experience off-equipment maintenance documentation?

AN/ARC-34 sets (C) Signup and view all the answers

Which of the following ID number scenarios would be acceptable?

Using a unified ID number for items with the same WUC and SRD. (C) Signup and view all the answers

What is the structure of an ID number, as explained?

Five characters, first a type code and last four match equipment serial number (D) Signup and view all the answers

How should data reporting accuracy regarding the ID number be maintained?

Validating that data reflected by ID numbers accurately matches the assigned equipment (D) Signup and view all the answers

In which of the following instances would equipment not need to have an ID number assigned?

If it is not managed by the owner's workcenter (A) Signup and view all the answers

Which category of ID numbers includes aircraft and cruise missiles?

ID number assigned to specific end item equipment (D) Signup and view all the answers

What does the last four characters of the ID number typically represent?

Last four positions of the equipment serial number (C) Signup and view all the answers

Which of the following statements about workcenters is NOT accurate?

Non-reporting workcenters must have assigned technicians to qualify. (C) Signup and view all the answers

What role does a team supervisor play in outside team maintenance entries?

To ensure completeness and accuracy of data submitted (C) Signup and view all the answers

What happens when the same workcenter manages multiple personnel participating in a maintenance action?

Only one entry is necessary per participating workcenter. (C) Signup and view all the answers

What does the fifth character of a WUC normally identify?

Reparable items (D) Signup and view all the answers

Which characters in WUCs are used to avoid confusion with the numerical characters one and zero?

I and O (A) Signup and view all the answers

What is the primary responsibility of the PM in relation to WUC tables?

Developing WUC tables and manuals (B) Signup and view all the answers

How are LCNs characterized in terms of length and formatting?

6 to 15 characters without embedded spaces (D) Signup and view all the answers

What can be indicated by a WUC with a 9 in the fifth position?

Not Otherwise Coded (NOC) (D) Signup and view all the answers

What do the first two characters of support general codes represent in WUCs?

Categories of work (B) Signup and view all the answers

What must occur before LCNs can be assigned to an aircraft?

System acquisition and approval by HAF/A4M (C) Signup and view all the answers

What aspect of WUCs is NOT true regarding the character specifications for different systems?

Fifth character represents warranty duration (C) Signup and view all the answers

In case of an equipment item that is Non-Work Unit Coded (NOC), what should be used for recording work performed?

WUC for related assembly (B) Signup and view all the answers

What identifies tasks of a general nature like equipment servicing and cleaning in WUCs?

Support general codes (B) Signup and view all the answers

What is true about the use of WUCs for aircraft sharing the same engine as others?

They must maintain separate coding systems (C) Signup and view all the answers

What role does the AFMC play regarding WUC tables?

Acquiring equipment lists for WUC assignment (D) Signup and view all the answers

What should be used in preference to WUC manuals for systems with reportable MICAP or MDD?

WUC tables in REMIS (C) Signup and view all the answers

What should be entered if a NOC WUC/LCN does not exist?

The WUC/LCN of the next higher assembly (A) Signup and view all the answers

What information is documented using the Reference Symbol field for electronics equipment?

Unique item identifiers such as Reference Designator Index (RDI) (C) Signup and view all the answers

Which of the following should be entered in the Quantity field?

The quantity of parts that were replaced during repair (A) Signup and view all the answers

What does an SRD code identify regarding an item?

Whether the item is Mission Capable (MICAP) or only inventory tracked (C) Signup and view all the answers

What is the purpose of the Type Maintenance Code (TMC)?

To categorize the maintenance work accomplished, like scheduled or unscheduled (C) Signup and view all the answers

Which of the following best describes a WUC?

A quick reference number for identifying system hierarchy and maintenance requirements (B) Signup and view all the answers

For egress items, what valid component position entries can be used?

Numeric entries from 0 to 8 (B) Signup and view all the answers

When an item qualifies for an SRD, what must be done before equipment fielding?

Assign the SRD code (C) Signup and view all the answers

What type of information is NOT typically included in the SRD code?

Weight and dimensions of the item (C) Signup and view all the answers

What role do workcenter supervisors or inventory managers play regarding SRDs?

They ensure accurate association of SRDs with assigned inventory (D) Signup and view all the answers

What happens to R&M data collection if SRD assignment is skipped?

R&M data cannot be collected (A) Signup and view all the answers

What should be documented during a special inspection using TMC?

TMC ‘S’ (special inspection) (C) Signup and view all the answers

What is the maximum number of characters allowed in a noun or abbreviation entered for equipment other than electronics?

Nine characters (C) Signup and view all the answers

For components repaired at the depot, which SRD should be used?

SRD from the AFTO Form 350 tag (B) Signup and view all the answers

What type of maintenance activity requires the assignment of an individual unique JCN?

Equipment discrepancies (C) Signup and view all the answers

In which situation should a grouped JCN be assigned?

For daily preflight inspections (D) Signup and view all the answers

Which of the following activities does NOT require the same JCN as that assigned to the inspection?

Functional checks of items withdrawn from supply (B) Signup and view all the answers

What inspection type is assigned a unique sixth position JCN entry indicating a minor isochronal inspection?

Entry B (C) Signup and view all the answers

Which type of inspection can utilize any alpha-character except O and I in the seventh position?

C-E calendar inspections (B) Signup and view all the answers

For which maintenance activity must an individual unique JCN be assigned according to the outlined steps?

Cannibalization actions (B) Signup and view all the answers

Which phase has the last sixth position JCN entry according to the inspection cycle?

Phase 8 (C) Signup and view all the answers

What is the purpose of assigning a grouped JCN during maintenance activities?

To simplify reporting of multiple inspections (C) Signup and view all the answers

What is the range of Support General LCNs as defined in the material?

05 through 15, excluding 06 (B) Signup and view all the answers

Which of the following identifies a requirement for major discrepancies during inspections?

Each major discrepancy must be documented individually (A) Signup and view all the answers

In terms of documenting work, how should non-coded items be recorded?

Using the LCN for the coded assembly they belong to (A) Signup and view all the answers

How does Usage Factor assist management evaluation?

By representing on time to off time ratios (A) Signup and view all the answers

Which of the following actions would be considered for TCTO actions on installed items?

Assigning an individual JCN (C) Signup and view all the answers

What does Quantity per Application (QPA) encompass?

Total items of the same WUC installed on an assembly (A) Signup and view all the answers

What characterizes Action Taken Code (ATC)?

It indicates the type of maintenance action performed (A) Signup and view all the answers

Which ATC is used exclusively for bench check actions?

Codes A, B, C, and D (C) Signup and view all the answers

When should ATC G be utilized?

When specific items lack a WUC (C) Signup and view all the answers

What does ATC Y signify in maintenance documentation?

Documentation of completed troubleshooting actions (C) Signup and view all the answers

What is the significance of using codes 1 through 9 in maintenance logs?

They can represent actions taken during subsequent shop processing (B) Signup and view all the answers

For which condition is ATC H appropriately used?

When no defects can be replicated or found (C) Signup and view all the answers

What purpose does the WUC serve when combined with an ATC?

It identifies the unit of work completed (D) Signup and view all the answers

Which situation would require the use of a system or subsystem code?

When performing unrelated work on an entire system (B) Signup and view all the answers

What must be recorded if ATC Y is used for troubleshooting?

A separate report for repair actions must be generated (B) Signup and view all the answers

What is the primary function of How Malfunction Code 799?

To indicate a non-defect situation (C) Signup and view all the answers

What must be documented if a maintenance action is performed on transient aircraft without a local ID number?

The two-position command code for the owning command must be used. (B) Signup and view all the answers

What should be done when it is determined that a maintenance action has been incorrectly documented in IMDS CDB?

The line should be marked with an 'ER' activity identifier. (D) Signup and view all the answers

How is the crew size documented when it exceeds nine members?

An additional entry is used to report the excess members. (C) Signup and view all the answers

Which statement is true regarding employee numbers assigned in bases supported by IMDS CDB?

A unique five-position employee number is programmatically assigned. (B) Signup and view all the answers

What should be documented for activities involving maintenance completion times?

Start and stop times should reflect any delays over 15 minutes. (B) Signup and view all the answers

What does NRTS time documentation exclusively include?

Only the completion time for bench checks. (D) Signup and view all the answers

What is the purpose of the Built-In-Test (BIT) fault reporting?

To report primary fault codes in the automated system. (D) Signup and view all the answers

Which situation requires special documentation due to crew size?

When a crew of more than ten members works on a job. (B) Signup and view all the answers

What type of codes can be used for local purposes such as tenant support or special projects?

Unique two-position codes devised locally. (A) Signup and view all the answers

How is the total man-hours for maintenance actions computed?

Considering the crew size along with start and stop times. (D) Signup and view all the answers

What specific requirement is placed on the documentation of a job completed at depot level?

Total actual man-hours required must be recorded. (B) Signup and view all the answers

What action should be avoided when documenting maintenance forms?

Using the supervisor’s ID for all tasks. (A) Signup and view all the answers

Which of the following best describes the process for documenting NRTS actions?

If bench checks exceed 10 hours, a deferred entry should be made. (B) Signup and view all the answers

What action must be taken if a bench check is completed and repair action is deferred?

ATC 'C' and '1' unit must be recorded on AFTO Form 349. (D) Signup and view all the answers

When is NRTS code '2' applicable in maintenance documentation?

When repair is authorized, but cannot be completed due to lack of specific tools. (D) Signup and view all the answers

Which statement accurately describes the use of code '8' in NRTS determinations?

It is used for authorization to send an item back to depot facilities. (D) Signup and view all the answers

What does the How Malfunctioned Code (HMC) focus on?

The nature of the defect. (C) Signup and view all the answers

What is the significance of recording the predominant cause when multiple NRTS causes exist?

It is mandatory to prevent reporting distortion. (B) Signup and view all the answers

What should be done if repairs required for an item are specifically prohibited by TOs?

Use code '1' for the item. (B) Signup and view all the answers

What is the required entry for an item that is to be shipped as a DR exhibit?

NRTS code '8' must be used. (C) Signup and view all the answers

Which action is NOT permissible for on-line users regarding their inputs?

They can correct entries after they have been made. (B) Signup and view all the answers

What does the When Discovered Code (WDC) indicate?

When a defect or maintenance requirement was identified. (B) Signup and view all the answers

Which of the following is true about How Malfunctioned Codes?

Only the predominant defect needs to be reported. (C) Signup and view all the answers

How are codes for major removals and replacements categorized?

Using action taken codes E, P, Q, R, S, T, and U. (C) Signup and view all the answers

What should be recorded if reassembly of an item is required before placing it in AWP status?

Parts required should be listed on block 29 of the AFTO Form 349. (A) Signup and view all the answers

What are the consequences of not accurately documenting NRTS causes?

Distortion in failure reporting. (A) Signup and view all the answers

What does HMC 553 specifically identify?

Improper manufacture or overhaul of components (A) Signup and view all the answers

In which scenario is HMC 800 applicable?

When components are removed to facilitate other tasks (A) Signup and view all the answers

Which HMC codes can be used with ATC 2, A, B, and C during on-equipment reporting?

HMC 242 and HMC 374 (B) Signup and view all the answers

What is required to use HMC 689?

Additional data regarding the conductive path malfunction (B) Signup and view all the answers

Which of the following reflects the correct documentation for units produced?

1 must be documented for any completed maintenance action (A) Signup and view all the answers

How should an entry be made when work is stopped due to a crew size change?

Record the last Action Taken code with units as 00 (A) Signup and view all the answers

When is it appropriate to document 0 units in a maintenance action?

When primary responsibility for the action belongs to another workcenter (A) Signup and view all the answers

What is a limitation placed on unit entries regarding their numerical value?

Unit entries are limited to two digits (D) Signup and view all the answers

Which statement is true regarding the category of labor in maintenance documentation?

A single entry suffices if all crew members share the same category (B) Signup and view all the answers

How is a wiring system conductive path defined under HMC 689?

It comprises external wires and connectors conveying power or data (B) Signup and view all the answers

What action is described by the HMC 242 code?

Reporting a component that has failed to operate (B) Signup and view all the answers

What is indicated when a maintenance action carries a unit entry of more than one?

The same action was performed multiple times (D) Signup and view all the answers

How must overtime spent by technicians be documented?

As hours worked beyond the standard shift of 8 hours (C) Signup and view all the answers

Why is an additional line entry necessary when reporting units beyond 99?

To ensure accurate tracking of maintenance actions (C) Signup and view all the answers

What must be recorded if a maintenance crew performs tasks across different labor categories?

Separate entries for each labor category involved (B) Signup and view all the answers

What is the role of the JCN in maintenance actions?

To report, control, and identify maintenance actions. (B) Signup and view all the answers

How many characters are in the base-level JCN?

Nine characters (B) Signup and view all the answers

What should be used when entering data into REMIS if the JCN is not provided?

JCN creation procedures outlined in the guidelines (D) Signup and view all the answers

What portion of the JCN is used to represent the ordinal day?

The first five characters (A) Signup and view all the answers

Which character positions are reserved for discrepancies discovered during the Look phase of an inspection?

The seventh, eighth, and ninth positions (D) Signup and view all the answers

What must be included with the original discrepancy to document cannibalization actions?

A related JCN (A) Signup and view all the answers

Which inspections allow for alpha characters in positions six and seven of the JCN?

C-E calendar inspections (D) Signup and view all the answers

What is a primary reason for assigning a block of sequence numbers for the JCN?

To ensure unique JCNs are assigned during similar inspections (A) Signup and view all the answers

Who maintains the WUC tables and their contact information?

The Equipment Specialist (ES) in ETIMS (A) Signup and view all the answers

What is the role of ASSIST Online in relation to Standards and Specifications?

To provide contact information for publications (C) Signup and view all the answers

What must happen to a JCN when all work has been completed?

It must be closed out by marking it visibly (C) Signup and view all the answers

What happens if the same numbered phase inspections occur on multiple items on the same day?

JCN duplication may occur. (B) Signup and view all the answers

Which character position of the JCN can contain alpha characters when conducting hourly and calendar phased inspections?

Sixth and seventh positions (A) Signup and view all the answers

Study Notes

Maintenance Documentation Codes (MDD)

MDD process uses codes for data recording of procedures and information
Codes facilitate data retrieval for reports and summarized maintenance/logistics data
Data elements, codes, and compatibility edits found in REMIS tables and this technical order (TO)
REMIS tables take precedence over all other sources for MDD data elements and codes
Narrative information complements coded data (avoid classified data in narratives)

Rules for Documenting Codes

Specific rules for documenting codes in this chapter found in Chapter 7

Code Updates

Recommended changes, additions, or deletions to codes/data elements follow the Recommended Change process in TO 00-5-1
SRD related requests submitted as prescribed in AFMAN 23-122
Job Control Number (JCN) and workcenter code recommendations forwarded through command channels to HQ AFMC/A4FI
Work Unit Codes (WUC) changes submitted per TO 00-5-1
- TO OPR has final approval authority for WUCs below system level (first two positions), except support general and sub-indentured end item WUCs (like engines, pods)
- System-level WUC prefixes defined by equipment type in MIL-DTL-38769
- Support General WUCs defined in Appendix I of TO
- New codes need HQ AFMC/A4F approval prior to weapon system table use
- Sub-indentured end item WUC tables developed by OPR for that equipment (Chapter 10, MIL-DTL-38769)
- Change requests must include complete PM TO OPR evaluation, including approval/disapproval recommendation, and necessary edits

JCN (Job Control Number)

Used to report, control, and identify each maintenance action
All maintenance jobs assigned a JCN
JCN assignment and control responsibility outlined in major command instructions
Locally, JCN links on- and off-equipment actions, employee hours, and replaced parts for maintenance requirements (discrepancies, inspections, TCTOs, time changes)
Every job assigned a JCN, except cannibalization actions; separate JCN for those (Chapter 5)
All job-related actions (regardless of workcenter, time, or location) use the assigned original JCN
Rules for assigning JCNs detailed in Table 4-1
Cannibalization actions documented separately (from discrepancies)
Original discrepancies and FOM (Facilitate Other Maintenance) actions have their JCNs with reference to the identified CANN JCN in discrepancy narrative

JCN Characters

Base-level JCN consists of nine characters
First five characters represent the ordinal day (e.g., 96041 for 10 February 1996)
Last four characters for daily/monthly job sequence number (e.g., 0001 for first job)
JCN example: 960410001
Depots use AFTO Form 350 (or equivalent) JCN data in REMIS (If no JCN provided, procedures mentioned here apply)

JCN Phase Inspections

Sixth position of JCN for inspections (hourly/calendar) is assigned alpha/numeric per Table 4-2
Highest-numbered phase inspection uses the associated JCN when multiple concurrent phase inspections exist (periodic, hourly post-flight, minor/major isochronal, home station checks)
C-E calendar inspections use alpha characters for positions 6 and 7
Block of sequence numbers reserved for JCNs for Look phase discrepancies (separate JCNs for major discrepancies, discrepancies on * items, carried-forward discrepancies, and those requiring supply items)
Minor discrepancies completed under Look phase inspection JCN
JCNs not used when correcting a previously assigned-JCN discrepancy (preflight, basic postflight, or other support general actions).
Alpha characters required in JCNs for SE, AGE, and ATE.
AMC exempted from alpha character requirement in sixth position for TF39 engine JCNs (due to MAD-ARS/GPS capability)

JCN for Discrepancies

Purpose: Easy tracking, simplified inspection data retrieval
Reserved sequence numbers: Ensure unique JCNs are assigned during inspections (for discrepancies)
Prevents JCN duplication

JCN Organization

JCN blocks assigned to equipment, organizations, or recurring maintenance actions (per TO, AFI 21-101)
AF Form 861 (Base/Transient Job Control Number Register) controls and records JCN assignments
IMDS CDB screen for base/transient maintenance actions (records JCN assignments)
AF Form 861 entry closure by drawing a line, checkmark, or visible means

Workcenter Code

Five-character code identifying organizational elements assigned maintenance personnel
Standard workcenter codes used by all organizations (AFI 21-101, major command directives)
Standard workcenter codes in Appendix A
Workcenters (except non-reporting ones) may fall under two or more workcenters
Four workcenter types
- Owning Workcenter: Basic custodial/maintenance responsibility
- Performing Workcenter: Performs maintenance and equipment calibration
- Reporting Workcenter: Any maintenance personnel assigned workcenter (reporting may be exempted; code represents performing technician's workcenter)
- Non-reporting Workcenter: Maintenance personnel expend man-hours, but no assigned personnel (e.g., contractors, training equipment)

Maintenance Location Data

MDD system for transient USAF, Air Reserve, and ANG aircraft maintenance
Station where maintenance performed provides data for off-base processing
AMC industrial funded aircraft maintenance data transmission to home station not required

Outside Team Maintenance Entries

Processed through the workcenter where the work is performed (e.g., depot/contractor workcenters)
Teams document all work at equipment operating sites
Team supervisors responsible for complete, accurate team data entry
Home station may pull production information from REMIS to ensure second workcenter code position accuracy

ID Number

Unique code; used to interpret data elements for maintenance actions
- On-equipment work: Computer routine converts to owning workcenter, equipment serial number/registration/designator, MDS, TMSM/TMS/end item WUC, and SRD
- Off-equipment work: Owning workcenter and SRD code
Minimizes errors by accurately inputting 4+ data elements with a single ID number

ID Number Characters

Five characters
First character is usually type equipment code (e.g., A for aircraft)
Last four characters often same as last four serial number positions
Modified/alphanumeric designators to prevent duplicate ID numbers

ID Number Categories

End item equipment (aircraft, cruise missiles, ICBMs)
Test Measurement and Diagnostic Equipment (TMDE) categories
Non-registered SE (maintenance stands, dollies)

ID Number Assignments for SE

Two types:
- Individually assigned for registered/powered SE or non-registered SE, determined by local management (via individual end item serial number)
- Grouped assigned to SE without individual registration info or those requiring less detailed MDD data (same end-item WUC and SRD)
Includes selected operational equipment for AETC technical training centers (training/preventive maintenance inspections)

Items Without ID Number Requirement

Equipment frequently transferred between owning workcenters
Items infrequently subject to maintenance
Low-inventory items
Items not assigned to maintenance organizations or subject only to off-equipment maintenance
End Items with SRDs require ID numbers for inventory tracking
ALC managed equipment without SRDs are not upchannel-reportable and do not require ID numbers

MDS/TMS/TMSM

Used instead of base-level ID numbers for equipment in transit, or when no ID is assigned, or when not otherwise used

FSC (Federal Stock Class)

Enter the first four digits of the National Stock Number (NSN); first digits not zero, no all-zeroes

Part and Lot Number

Required for modified or removed items (including applicable alpha-numeric characters)
Part numbers left-justified, up to 15 characters, no special characters except dashes (/),slashes (/), and periods (.). No leading/embedded spaces; these characters not allowed on first/last character position.

Serial Number/Operating Time

Required for serially controlled items, usually 10 alpha-numeric characters (15 for C-E); no special characters
Use last 10/15 characters for exceeding maximum length
Enter current operating time for time-change, serially-control, or RIW

Tag Number

Enter complete AFTO Form 350 tag number for removed items with tracked indicator in WUC table

Installed Item Part Number/Lot Number

Required part and lot numbers (if applicable) for installed items
Includes lot number for conventional munitions time-change items, or equipment with B/C Egress Indicator

Operating Time

Enter previous operating time for time-change/serially-controlled items (including RIW) to nearest whole hour
For ETI items: ETI reading to nearest whole hour.
For calendar items; nearest day/month

Discrepancy

Narrative description completely describing the problem
Include multiple BIT fault codes (facilitate failure analysis, speed repairs)

Corrective Action

Detailed actions taken to correct the problem

Corrective Action Narrative

Detailed narrative describing the corrective action taken
Includes action taken code, WUC nomenclature (from IMDS CDB and TOs), malfunction code (if different from WCE narrative), and units produced (from DDR)
Examples (general descriptions): ongoing work, work identified as serviceable, etc.

Parts Replaced During Repair (Bit & Piece Data)

Documents non-reparable/non-recoverable items replaced
Excludes major assemblies/subassemblies previously documented
Restricted to non-reparable/non-recoverable items contributing to the failure
Excludes commonly replaced hardware (like nuts, bolts)
Use restricted Action Taken Codes (F or G for on-equipment, A, F, or G for off equipment)

SRD (Standard Reporting Designator)

Three-character code in various MISs for reporting, accounting, and analysis of equipment
Identifies mission capability (MICAP), MDD, and TCTO reportability, or inventory tracking)
Determines which TMCs and When Discovered Codes are permissible

SRD Reporting

Up-channeled reportable, non-classified SRDs in REMIS SRD table
End item equipment designator and associated SRD code required
SRD assigned before equipment fielding to track inventory and maintenance (R&M data collection)

TMC (Type Maintenance Code)

One-character code identifying maintenance type (scheduled/unscheduled)
Contained within Appendix of this TO and REMIS Reference tables

TMC, SRD, and Equipment

Permitted TMCs per assigned SRD codes (Appendix D)
Special inspections/support general maintenance during special inspections documented using TMC "S"

Component Position

One-digit numerical code used to identify installed engine or egress item positions
Entry required for installed engines and components/egress items(B/E indicators)

WUC (Work Unit Code)

Reference number identifying system, subsystem, and component relationships for maintenance requirements and accomplished maintenance
Reflects installation hierarchy
Standard method of sorting/summarizing maintenance data
Used to view reported data across multiple platforms, assess corrective actions
ALC vs. non-ALC managed equipment
WUC manuals (-06) and REMIS tables for each reportable system
Non-AFMC managed equipment WUCs loaded to REMIS by ACC/CYSS

LCN (Logistics Control Number)

May be used instead of WUC for 5th-generation aircraft and installed engines
MIL-STD-1808 based; 6-15 characters, no embedded spaces/special characters
Assigned during system acquisition
Support General LCNs defined in Appendix I
Not used with NOC code (or non-LCN items)

WUC Tables

PM responsible for WUC table/manual development
SRD/ID number for equipment identification in data.

Usage Factor

Ratio of actual use time to operating time (flying hours, etc.) for the weapon system

QPA (Quantity per Application)

Total number of same WUC items installed on the next higher assembly

ATC (Action Taken Code)

One-character code identifying maintenance actions
Standard for all equipment; list in all WUC tables
Appendix E and REMIS reference tables
Restricted ATCs for bench check (off-equipment only)
ATCs 0-9, A-D permitted (on-equipment) for uninstalled end items/shop processing.

WDC (When Discovered Code)

Alpha-numeric character identifying when a defect was discovered
Used for all subsequent repair actions (the WDC when the issue was first detected is used)

HMC (How Malfunctioned Code)

Three-numeric characters identifying the nature of the defect
Not the cause; contains TCTO action info, other non-failure actions
Used to report completion of TCTO actions or other events where failures don't exist.
Contains information on how components failed

UP (Units Produced)

Identifies completed actions
1 (one) unit completed (TCTO completion, look-phase, time changes)
Additional line entry if more than 99 units
00 unit entry when incomplete actions or no responsibility to complete action

Category of Labor

Differentiates man-hour types
Single entry for same type labor; separate for different labor/overtime
Maximum 10 hours/minimum 1 minute for elapsed time (per duty shift)

Command and/or Activity Identification

Two-position command code or local/devised two-position code for special projects, tenant, cross-training, etc.
"ER" for incorrectly documented actions (in IMDS CDB)
Used when reporting off-equipment maintenance using only the SRD code

Employee Number/UserID

Unique employee identification for maintenance actions, either locally assigned or programmatically assigned
USERID assigned during military career for use in documentation
Employee numbers/USERIDs not required for automatically generated jobs (inspections, etc.)

Start and Stop Time

Reflects time expended for maintenance action
Complete for delays exceeding 15 minutes and for changes to crew size/categories.
Used to calculate total man-hours expended.
2400 for midnight

Crew Size Entries

One-digit number of participants (same workcenter, category of labor)

BIT Fault Reporting

Systems with BIT fault reporting enter fault codes directly (automated system or discrepancy narrative)
Extra fault data in the reported discrepancy block if more than one fault exists

MJSN (Master Job Standard Number)

Enables automated transfer of weapon system time change and inspection data
Useful for reporting inspections, time-change items, serially-controlled items
MJSN with alpha character in first position is standard across weapon systems

Tables 4-1, 4-2, 4-3

Contain specific details regarding JCN assignments, phase inspections, and additional JCN entries (details about sixth/seventh JCN position assignments for various types of inspections)

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Description

Test your knowledge of the Maintenance Data Dictionary process, including the roles of coded and narrative information, authority for code changes, and documentation rules. This quiz covers the essential aspects of managing Work Unit Codes and their specific requirements.