Autoflight 747-400

Question 1

What does the autoflight system incorporate?

Answer 1

Two independant subsystems

1) AFDS = Auto flght director system
2) A/T = Auto Throttle System

Question 2

Why must AC and DC busses 3, 1, and 2 be isolated for multi-channel A/P operation?

Answer 2

To insure an independent power source for each FCC, and to minimize electrical faults.

Question 3

What is lost during 3 channel operation when Hyd system 3 is lost?

Answer 3

F/D L is available and A/P L unserviceable.

Question 4

During AUTOLAND approach and being established on the ILS, how can you exit from LOC and G/S mode?

Answer 4

1) Disengaging A/P and FD switches off

2) Pushing TO/GA switch

Question 5

With the A/T armed, but A/T disconnected, is speed protection available?

Answer 5

No.

Question 6

What is the minimum altitude to engage the A/P?

Answer 6

250FT

Question 7

What is the maximum crosswind, headwind, and tailwind limitations for autoland?

Answer 7

Crosswind: 25Kts
Headwind: 25Kts
Tailwind: 15Kts

*If one engine inop, Tailwind: 10kts.

Question 8

What is the LNAV engage criteria?

Answer 8

1) 50Ft above airport elevation

2) Within 2.5NM of active route.

Question 9

Why is the A/T mode THR and not THR REF during a climb in FLCH SPD mode?

Answer 9

The A/T sets variable thrust up to reference thrust, to maintain a vertical speed proportional to the altitude change.