Chapter 5 - Automatic Trim Control

Question 1

What are the fast and slow elevator motors used for primarily?

Answer 1

Fast - During takeoff and approach
Slow - Used for cruise

Question 2

Which elevator motor is used by the autopilot?

Answer 2

Slow motor

Question 3

What do the control wheel trim switches operate?

Answer 3

High speed system of the elevator

Question 4

What can an additional low speed manual trim switch be used for?

Answer 4

Cruise trimming of the elevator

Question 5

What does manual operation of the pitch trim system by the pilot disconnect and why?

Answer 5

The autopilot

If the pilot needs to trim the elevator, the autopilot is not doing its job correctly

Question 6

What is the purpose of the airspeed function in the pitch trim system?

Answer 6

At cruise speeds the elevator pitch trim system operates at smaller deflections

At approach or take-off speeds, automatic pitch trimming is not initiated until larger deflections

Question 7

What are the command response faults?

Answer 7

• Dead trim
• Unscheduled trim
• Stabiliser moves opposite direction to autotrim command

Question 8

When is Flap Trim Compensation (FTC) not applied at between 0 and 18 degrees of flap?

Answer 8

• Aircraft is on the ground
• Flap change occurs in a time greater than 45 seconds
• Electric trim is operating
• Auto trim is producing trim commands

Question 9

What is Cat 3 trim up bias?

Answer 9

For CAT 3 autoland systems, a nose up biased mis-trim is induced below 600 feet radio altitude to cause a pitch up effect if the autopilot is disengaged