Module 11.18 On board maintenance

Question 1

What is the purpose of the On Board Maintenance System (OBMS)?

Answer 1

Test aircraft systems, record and store the fault data and provide info to the engineer

Question 2

In the latest OBMS, what can the aircraft do?

Answer 2

Relay the fault info to the ground while inflight

Question 3

What can the FMS also store?

Answer 3

AMM, TSM, FIM etc

Question 4

What is the purpose of the FMC?

Answer 4

• Fault status
• Initiate tests
• Generate fault reports from prev flight legs
• Up/down load data and software
• Fault ident

Question 5

How do you operate the CMS?

Answer 5

Via the MCDU

Question 6

What is the main processing unit of CMS?

Answer 6

The CMC

Question 7

What does CMC crosstalk enable?

Answer 7

Share and monitor faults between CMC’s and no data loss if one CMC is shutdown due to poor health

Question 8

What is a hard failure?

Answer 8

When the system doesn’t work at all

Question 9

When would BITE be used?

Answer 9

When there is power to the system

Question 10

When would reporting mode be on the MCDU?
- Interactive mode?

Answer 10

Inflight - reporting mode
On ground - Interactive, only when selected

Question 11

When it displays a fault how does it show it?

Answer 11

ATA chapter reference + most probable cause

Question 12

What is the data stored in?

Answer 12

Non volatile memory

Question 13

On older aircraft, what can be used to download data?

Answer 13

Disk drive units

Question 14

What are the two disk drive modes? What is different about the two modes?

Answer 14

• Automatic, data can be viewed and downloaded
• Manual, data can only be downloaded

Question 15

If there is no MDDU how can uploading and downloading functions be preformed?

Answer 15

Through a connector using a portable data loader

Question 16

How may uploading be carried out?

Answer 16

• Repository to computer
• Dedicated sources to repository
• Directly from CD etc. to computer

Question 17

What is the MAT?

Answer 17

Maintenance Access Terminal

Question 18

What does the MAT allow?

Answer 18

Uploading/downloading software, CMC interface

Question 19

What does the Electronic Library System (ELS) do?

Answer 19

Gives the flight crew and engineers access to information necessary to operate and maintain the aircraft

Question 20

What does the Electronic Flight Bag (EFB) system allow?

Answer 20

Flight management tasks to be carried out easier and with less paper usage

Question 21

Where would the printer be located?

Answer 21

At the rear of the centre pedestal

Question 22

What may be printed off?

Answer 22

• ACARS messages
• Weather
• EFB
• CMCS etc.

Question 23

When would the amber light on the printer come on?

Answer 23

• Self test starts and fails
• Front door open
• Printer out of paper

Question 24

What can Structural Health Monitoring (SHM) increase?

Answer 24

Structural allowable limits

Question 25

What can be used for SHM?

Answer 25

• Fatigue meters
• Strain gauges
• Intelligent skin

Question 26

What do intelligent skins have embedded in them?

Answer 26

Fibre optic sensors

Question 27

Which main menu tab on a MAT finds the data load functionality?

Answer 27

Extended maintenance