Flaps

Question 1

What powers the alternate flaps?

Answer 1

electric motors

Question 2

Does alternate flaps provide asymmetry protection?

Answer 2

no

Question 3

When would you use alternate flaps?

Answer 3

“Flap Control” EICAS message (lose the flap control computers or flap lever is INOP)

Question 4

How many flap control units are there and what are their purpose?

Answer 4

3- sequencing and monitoring of flap operation- primary control, secondary control indication and annunciation- TE flap asymmetry protection in primary and secondary modes- flap load relief in primary mode only- flap position information to EICAS and other systems

Question 5

Where do you read the flap display?

Answer 5

primary EICAS

Question 6

What is the difference between the alternate flap mode of operation and the secondary flap mode of operation?

Answer 6

while electric motors are used in both modes, the sequencing is different- in the alternate mode LE and TE extend together - in secondary mode, inboard and midspan LE extend when flap lever is set at flaps 1, the outboard LE extend when flap lever set at flaps 5

Question 7

what does an X in one of the expanded flap indicators mean?

Answer 7

sensor for that particular flap position indicator is not powered