Aircraft Maintenance Safety: Central Maintenance System Quiz and Flashcards

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Questions and Answers

What is the primary function of the On-Board Maintenance System (OMS)?

To provide real-time weather updates to the pilots

To perform automatic maintenance tasks

To assist maintenance personnel in fault-finding of complex avionics systems (correct)

To monitor aircraft performance during flight

What is the main benefit of the On-Board Maintenance System (OMS)?

It increases the weight of the aircraft

It reduces the need for human maintenance personnel

It minimizes ground time, increases efficiency, and improves cost-effectiveness (correct)

It only supports line maintenance

Which component of the Central Maintenance System (CMS) is used to extract maintenance data?

Central Maintenance Computers (CMC) (correct)

Electronic library system

Multipurpose Control and Display Units (MCDU)

Data loading system

What is the purpose of the Electronic library system in the On-Board Maintenance System (OMS)?

To store maintenance data Signup and view all the answers

What is the benefit of the On-Board Maintenance System (OMS) in terms of engineering follow-up?

It supports systems, aircraft, and fleet monitoring Signup and view all the answers

What is the purpose of the Report printing system in the On-Board Maintenance System (OMS)?

To print maintenance reports Signup and view all the answers

What is the primary purpose of the ARINC 429 link between CMC 1 and CMC 2?

To enable cross talk and exchange general data between the two computers Signup and view all the answers

What is the purpose of the flight warning computers?

To monitor system failures and display warnings on the ECAM Signup and view all the answers

How are system failures classified on the ECAM display?

In three categories based on their operational and safety consequences Signup and view all the answers

What happens to warnings on the ECAM display at the end of the flight?

They are automatically cancelled Signup and view all the answers

What type of failures are displayed as warnings in real-time on the ECAM?

Class 1 failures with operational consequences for the current flight Signup and view all the answers

Where are fault codes and messages stored in case of a system failure?

In a non-volatile memory system Signup and view all the answers

What type of failure is the loss of one engine's hydraulic pump?

Class 2 Signup and view all the answers

Where are the systems affected by Class 2 failures identified?

ECAM STATUS page Signup and view all the answers

What is the primary function of electronic flight bags on flight decks?

To perform tasks previously requiring reference books and mathematical calculations Signup and view all the answers

According to the Civil Aviation Authorities, how many classes of EFB hardware are defined?

Three Signup and view all the answers

What type of system computer can memorise failures occurring in the last 64 flights?

Type 1 Signup and view all the answers

What is a characteristic of Class 1 EFB systems?

They are not attached to a mounting device on the flight deck Signup and view all the answers

What is the output connection for Type 2 system computers?

ARINC 429 bus Signup and view all the answers

What is possible with Class 2 EFB systems?

They can connect to avionics equipment Signup and view all the answers

What is the primary purpose of the CMC in relation to system computers?

To facilitate troubleshooting Signup and view all the answers

What message is displayed on the data loader LCD throughout the transfer?

TRANSFER IN PROG Signup and view all the answers

What is the typical capacity of a standard 3.5-inch disk used in older data loaders?

1.44 MB Signup and view all the answers

What type of failure has neither operational nor safety consequences for the aircraft?

Class 3 Signup and view all the answers

What is the term for Class 1 EFB systems?

Portable Electronic Devices (PEDs) Signup and view all the answers

What type of media is commonly used in newer data loaders?

PCMCIA cards Signup and view all the answers

What is a difference between Class 1 and Class 2 EFB systems?

Class 1 EFBs are not connected to a mounting device, while Class 2 EFBs are Signup and view all the answers

What is the purpose of loading Field Loadable Software (FLS) into the target hardware?

To load new software onto the aircraft Signup and view all the answers

Where should a copy of the loaded Loadable Software Aircraft Part (LSAP) be kept?

On-board the aircraft Signup and view all the answers

Who is authorized to issue a Certificate of Release to Service after loading a Loadable Software Aircraft Part (LSAP)?

Line/base maintenance staff Signup and view all the answers

Study Notes

On-Board Maintenance System (OMS)

Developed to assist maintenance personnel in fault-finding of complex avionics systems
Uses a range of techniques to minimize ground time, improve maintenance efficiency, and reduce costs
Consists of Central Maintenance System (CMS), Data Loading System, Electronic Library System, and Report Printing System

Central Maintenance System (CMS)

Enables mechanics to extract maintenance data and initialize tests on aircraft systems
Main components include Central Maintenance Computers (CMC 1 and 2) and Multipurpose Control and Display Units (MCDU 1, 2, and 3)
CMC 1 and CMC 2 are interfaced via an ARINC 429 link for cross-talk and can exchange general data

Flight Warning Computers and ECAM Displays

Monitor operational data to display warnings and system information
Warnings are displayed automatically with the relevant flight phase and can be recalled from non-volatile memory
Failures are classified into three categories based on operational and safety consequences

Failure Classification

Class 1: Failures with operational consequences for the current flight
Class 2: Failures with no operational consequences for the current flight
Class 3: Failures with no operational or safety consequences for the aircraft

Aeroplane System Computers

Linked to CMC with different hardware interfaces and BITE characteristics
Categorized into three types based on memory and connection to CMC:
- Type 1: Connected to both CMCs, can memorize failures from last 64 flights
- Type 2: Memorizes failures from last flight, can initialize system tests

Electronic Flight Bag (EFB)

Classified into three classes by Civil Aviation Authorities
Class 1: Portable, COTS-based, connected to certified power source, no administrative control required
Class 2: Portable, COTS-based, connected to aircraft power, airworthiness approval required
Class 3: Installed, aircraft-powered, airworthiness approval required

Data Loading

Older data loaders use 3.5-inch disks (1.44 MB) or CD-ROMs (700+ MB)
Newer media include PCMCIA cards or USB sticks
Software Management: Field Loadable Software (FLS) loaded into target hardware using Portable Data Loader (PDL) or Airborne Data Loader (ADL)

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Description

Learn about the On-Board Maintenance System (OMS) designed to assist maintenance personnel in fault-finding complex avionics systems. Understand its functions and role in aircraft maintenance and engineering follow-up.

Aircraft On-Board Maintenance System (OMS) Introduction

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