00-20-1 Chapter 4

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Questions and Answers

What does the Red X symbol indicate about an aerospace vehicle or equipment?

It is considered unsafe or unserviceable. (correct)

It requires routine maintenance.

It is ready for flight or operation.

It is in compliance with inspection requirements.

Under what condition can equipment with a Red X be operated?

During maintenance inspections.

For routine flight training exercises.

When scheduled for routine check-ups.

For troubleshooting or repair purposes only. (correct)

Which of the following actions requires the use of a Red X?

Scheduled maintenance after a flight.

Receipt of specific TCTOs or service bulletins. (correct)

Heavy inspections for minor damages.

Routine checks of minor equipment.

Which symbol represents the least serious condition of aerospace vehicle or equipment?

Red Diagonal Signup and view all the answers

Who is authorized to clear a Red X condition on aerospace equipment?

Maintenance personnel authorized to inspect the work Signup and view all the answers

Which items do not require Red X documentation during pre-launch work?

Pitot covers and gear pins Signup and view all the answers

What is the primary reason a Red X must be cleared before an aerospace vehicle can be flown?

To address potential hazards and safety issues. Signup and view all the answers

What is not a reason to apply a Red X symbol?

When routine servicing is completed. Signup and view all the answers

What does a Red W symbol indicate in the context of aerospace equipment?

The equipment is inoperative for its intended use but does not impede mission success. Signup and view all the answers

What condition does a Red C symbol reflect?

The equipment has been contaminated but is still safe for operation. Signup and view all the answers

Which statement about the Red C discrepancy is accurate?

It should detail the type and level of contamination present. Signup and view all the answers

How is a Red W discrepancy treated after being entered?

It is cleared using the same procedure as a Red X. Signup and view all the answers

What should be included in the corrective action block when clearing a Red C?

Details on the highest level of contamination and post-decontamination status. Signup and view all the answers

Which of the following is true regarding contamination indicated by a Red C?

It reflects an infestation that does not impact operational capability. Signup and view all the answers

What is the role of the Installation Bioenvironmental Engineering Office regarding a Red C?

To clear the Red C after determining the safety of the equipment. Signup and view all the answers

Which of the following statements accurately describes the implications of a Red W symbol?

It requires corrective actions to restore the equipment to operational status. Signup and view all the answers

What is indicated by the presence of a Red Dash symbol?

The condition of the equipment is unknown and there may be a serious condition. Signup and view all the answers

When should a Red X be upgraded after a Red Dash if the aerospace vehicle is due PDM?

After 90 days unless an extension is obtained. Signup and view all the answers

Which condition does NOT require a Red X entry?

Database loading for mission essential systems. Signup and view all the answers

What is the proper action when an aerospace vehicle weight and balance is unknown?

Utilize a Red Dash to mark the condition. Signup and view all the answers

What is the main purpose of a Red Diagonal symbol?

To signal a discrepancy exists but is not urgent. Signup and view all the answers

What is required for an inspector to clear a Red X symbol?

Their last name initial and minimum signature. Signup and view all the answers

What exception applies to the maintenance and inspection requirements on Munitions Materiel Handling Equipment (MMHE)?

They must be completed by the next major inspection. Signup and view all the answers

When must an aerospace equipment inspection be accomplished after a Red Dash is assigned?

During the next scheduled major inspection. Signup and view all the answers

In what situation is a Red Dash used for Alternate Mission Equipment (AME)?

When it is overdue for a scheduled inspection. Signup and view all the answers

What is a reason for placing a Red Dash on aerospace equipment?

Operational checks are due. Signup and view all the answers

When can inspection results be ignored and a Red X not be issued?

If specific exemptions apply to the equipment. Signup and view all the answers

What does it mean if a maintenance crew member signs the CORRECTED BY block?

They were involved in the work required. Signup and view all the answers

Under what condition can database loading be exempt from requiring a Red X entry?

When it does not jeopardize flight safety. Signup and view all the answers

What action must an inspector take to clear a Red X after an inspection is accomplished?

Enter a statement in the CORRECTIVE ACTION block Signup and view all the answers

Which block is left blank after signing off a Red X?

CORRECTED BY Signup and view all the answers

How should an individual sign off a Red diagonal discrepancy?

Place their last name initial over the symbol and sign in the INSPECTED BY block Signup and view all the answers

What is required before a designated individual can sign off a Red X in the absence of qualified maintenance personnel?

The home station GP/CC must designate them Signup and view all the answers

When upgrading a Red diagonal symbol to a Red X, what must be done with the minimum signature of the original entry?

It is crossed out and replaced with the new entry Signup and view all the answers

Who is responsible for annotating a downgraded symbol in the CORRECTIVE ACTION block?

The supervisor who authorized the downgrade Signup and view all the answers

What should be included in the CORRECTIVE ACTION block when a Red Dash is upgraded to a Red X?

A statement about the upgrade and a reference to the original entry Signup and view all the answers

What should be entered in the CORRECTIVE ACTION block when a Red symbol is entered in error?

Enter 'Symbol entered in error, discrepancy and correct symbol reentered on page ____, item ____.' Signup and view all the answers

What process is followed if immediate action on a TCTO is deferred?

Annotation of a waiver in the CORRECTIVE ACTION block Signup and view all the answers

Which action is required when a Red X or Red W is entered in error?

Initial over the symbol and complete the INSPECTED BY block if authorized. Signup and view all the answers

What statement should be used to correct an erroneous initial entry?

Initial entered in error, discrepancy reentered on page_____, item_____. Signup and view all the answers

What must supervisory personnel do if they believe a Red X condition is less serious than represented?

Contact the GP/CC or an authorized personnel to request a downgrade Signup and view all the answers

What is the consequence of erroneously entered MIS entries related to scheduled maintenance?

They must remain in the system but manually corrected Signup and view all the answers

Who is allowed to clear discrepancies entered in error?

Individuals with proper clearance through the CORRECTED BY block. Signup and view all the answers

What must be done when erroneous MIS entries created by Scheduling are discovered?

They must be deleted, not signed off. Signup and view all the answers

What should an individual do after discovering a more serious defect represented by a previously entered Red diagonal?

Upgrade the symbol and document the action appropriately Signup and view all the answers

What must be annotated in the CORRECTIVE ACTION block when downgrading a symbol?

A statement of the downgrade and reference to previous entries Signup and view all the answers

What needs to be documented in the CORRECTIVE ACTION block when downgrading a Red X for a one-time flight?

The statement must indicate the Red X changed to a Red diagonal for one-time flight. Signup and view all the answers

When should a Red Dash symbol be upgraded to a Red X?

When a maintenance evaluation indicates a serious defect Signup and view all the answers

What should an individual do if a downgrading official is unavailable to sign the INSPECTED BY block?

Mention the authorized official’s name in the continuation. Signup and view all the answers

What must be included in the DISCREPANCY block when downgrading a Red X?

The original discrepancy and a statement of temporary repair. Signup and view all the answers

What is the procedure for clearing a Red Diagonal or Red Dash when entered in error?

Minimum signature in the CORRECTED BY or INSPECTED BY block and initial over the symbol. Signup and view all the answers

When a Red Diagonal is upgraded to a Red X upon arrival at the destination, what must be done?

The original discrepancy must be referenced. Signup and view all the answers

What is responsible for the advancement of due date/time for inspections when clearing erroneous MIS entries?

Clearing the discrepancies as entered in error. Signup and view all the answers

What is the role of the GP/CC or designated official in the context of downgrading a Red X?

They oversee the process and authorize the one-time flight. Signup and view all the answers

What should NOT be done when a discrepancy is entered in error?

Re-entered incorrectly. Signup and view all the answers

Study Notes

Aerospace Vehicle Maintenance Symbols

Symbols on maintenance documents indicate status: condition, airworthiness, servicing, inspection, maintenance
Red X: Most serious—aircraft, equipment, or special equipment (SE) unsafe/unserviceable, non-airworthy, or unknown status. Cannot be flown/used until corrected. Exceptions include troubleshooting/repair operations (but not high-speed taxiing).
- Red X applies when: equipment unsafe/unserviceable/non-airworthy; immediate action Technical Control Technical Order (TCTO) or commercial service bulletin; expired TCTO/commercial bulletin; urgent/safety TCTOs/service bulletins; egress final required; overdue Ancillary Flight Equipment (AFE) inspections (with exceptions for alert status/away from home base); overdue time change AFE components; major inspection (ISO, PH, PE, PDM) started; scheduled inspection renders equipment unsafe/unserviceable; inspections not completed by next major inspection (Periodic, isochronal, phase, HSCs, HPOs, or commercial equivalents); weight and balance unknown; foreign object (FO) inspection required for engine areas; impounding equipment; parts/assembly removal/replacement affecting safety. Dash 21 Equipment exceptions (pitot covers, gear pins, etc.)
Red W (ICBM only): Second-most serious for ICBMs indicating inoperable equipment not affecting launch, flight, or control but requiring immediate attention. Same clearance procedures as Red X.
Red Dash: Equipment condition unknown; potentially more serious issue than indicated.
- Red Dash applies when: accessory replacement/operational/cure checks or Functional Check Flight (FCF) due; inspection due per applicable technical order; Alternate Mission Equipment (AME)/Normally Installed Equipment (NIE) due inspection (aircraft must be unarmed/unused); inspection portions unfinished due to lack of parts/equipment); Preliminary Design Model (PDM) due (upgrades to Red X after 90 days unless extension);
Red Diagonal: A discrepancy exists, but not serious enough to ground the vehicle.
- Red Diagonal applies when: Urgent action or Category I, routine action safety modification TCTO/commercial equivalent; Condition-Based Maintenance Plus (CBM+) Forecast/Maintenance Alert requiring action.

Clearing Red Symbols

Authorized personnel must clear symbols.
Red X: Inspector initialing the symbol, verifies work was correctly completed, and signs the inspected and corrected blocks.
Red Dash: Individual who performs inspection/corrective action initial's the symbol and signs the inspected block.
Red Diagonal: Individual who performs corrective action initial's the symbol and signs the corrected block
Exceptions for locations lacking qualified personnel; Depot Field Teams/Contract Field Teams.
- If an aircraft must be flown with a Red X for a single flight, a special form is used and specific conditions must be met in order for it to be cleared.

Changing Symbols

Symbols cannot be changed once entered
Upgrading a symbol (e.g., Red Diagonal to Red X):
- New discrepancy details are entered, including the discoverer, while maintaining a record of the previous symbol and its assigned individual.
Downgrading a Red X (e.g., to Red Diagonal):
- The downgrading official notes the action, including the individual and date. A new block shows the downgrade action, with the old discrepancy details.
Symbol errors (e.g., erroneous Red X):
- Erroneous entries are corrected. This has specific guidelines to ensure proper due dates and record keeping are maintained.

Red C (Contamination)

Used to denote chemical, biological, radiological, or environmental contamination.
- Indicates contaminated aircraft/equipment, noting the highest level of contamination, type, and required Personal Protective Equipment (PPE) for use/maintenance.
- Always cleared by the installation Bioenvironmental Engineering Office. Contamination does not mean the aircraft/equipment is unsafe to operate/maintain.

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Test your knowledge about the Red X symbols used in aerospace vehicles and equipment. This quiz covers the conditions required for clearing a Red X, the impacts of Red W and Red C symbols, and the responsibilities of personnel regarding these symbols. Perfect for aerospace engineering students and professionals.