Type training · Boeing 777 B1.1 · ATA 45
Boeing 777 B1.1: Central Maintenance Computing (ATA 45)Type training questions & answers
MAT and PMAT, CMCF redundancy, flight deck effects and maintenance messages, fault history and ground tests.
- A worked explanation on every question
- Written for the 777-200/-200ER with GE90, PW4084 or Trent 800 engines
- Read in English or 15 other languages
Sample Central Maintenance Computing questions with answers
Three questions from the free preview. Think of your answer first, then open the explanation.
1.How many 777 central maintenance computing functions (CMCFs) control the outputs at one time?
- A.Both, sharing the load
- B.One per AIMS processor card
- C.One; the other is backup
Show answer and explanation
Correct answer: C. One; the other is backup
There is a CMCF in each AIMS cabinet; only one operates as primary, the other is a backup. Ref Olympic B777 training manual, ATA 45.
2.With both CMCFs serviceable after power-up, which one is primary?
- A.The last one used
- B.The left CMCF
- C.The right CMCF
Show answer and explanation
Correct answer: B. The left CMCF
The left CMCF is primary. The right becomes primary if the left fails or if you switch it from the MAT. Ref Olympic B777 training manual, ATA 45.
3.What happens when the BITE of the controlling 777 CMCF detects a failure?
- A.The MAT goes to SELF LOAD
- B.The offside CMCF takes over
- C.Both CMCFs restart together
Show answer and explanation
Correct answer: B. The offside CMCF takes over
BITE records a shop fault and the failed CMCF loses control to the offside CMCF, which becomes primary. Ref Olympic B777 training manual, ATA 45.
Part of the Boeing 777 B1.1 type course
One chapter of the Boeing 777 B1.1 type course question bank, for the 777-200/-200ER with GE90, PW4084 or Trent 800 engines, written in our own words for revision. Your type course and the aircraft maintenance manual stay the authority: limits and procedures can differ between airframes and operators.
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