Chapter 6.90 - Flight Controls Flashcards
When is the FEEL DIFF PRESS light armed?
What does it indicate?
Is this a single or dual channel light?
Always armed (armed with TE flaps up on some -700/-800 models)
There is a significant difference between the two elevator feel computers, caused when either hydraulic system or elevator feel pitot system fails
Single channel light
When is the SPEED TRIM FAIL light armed?
When is speed trim available?
Is this a single or dual channel light?
Always armed
- Fully enabled between 100 knots and Mach .60 with a fadeout to zero by Mach .68
- 10 seconds after takeoff
- 5 seconds after last trim input
- Autopilot not engaged
- Sensing of trim requirement
Dual channel light
When is the MACH TRIM FAIL light armed?
What is the limit for this light?
Is this a single or dual channel light?
Always armed
280 knots / .82 Mach
Dual channel light
When is the AUTO SLAT FAIL light armed?
When is the auto slat function available?
Is this a single or dual channel light?
Always armed
Slats in extended position approaching a stall
Dual channel light
When is the standby hydraulic pump automatically activated?
- Loss of system A or B, and
- Flaps extended, and
- Airborne or wheel speed is greater than 60 knots, and
- FLT CONTROL switch A or B hydraulic system ON, or
- The main PCU force fight monitor (FFM) trips
What happens when the FLT CONTROL switch is moved to STBY RUD?
- Standby hydraulic pump is turned on
- Respective flight control valve closes (A or B)
- Standby rudder valve is opened
- Deactivates the related flight control LOW PRESSURE light
- Illuminates the amber STBY RUD ON, MASTER CAUTION and FLT CONT lights
- Allows the standby system to power the rudder, thrust reversers, leading edge flaps and slats (extend only) and the standby yaw damper
What causes an amber SPEEDBRAKES EXTENDED light?
- SPEED BRAKE lever is aft of ARMED, and
- TE flaps greater than 10, or
- RA is less than 800 feet
What are the speed brake restrictions?
- Do not deploy with flaps extended beyond flaps 15
- Do not deploy at RA below 1,000 feet
When will auto speed brakes deploy on landing?
- SPEED BRAKE lever is ARMED
- RA is less than 10 feet
- Landing gear strut compresses (compressing right strut will also deploy ground spoilers)
- Both thrust reversers are IDLE
- Wheel speed is greater than 60 knots
What happens when the alternate flaps switch is moved to arm?
- Turns standby hydraulic pump on
- Arms standby hydraulic pump LOW PRESSURE light
- Closes trailing edge bypass valve
- Bypasses asymmetry and skew protection
- Arms alternate flap switch
What happens when the alternate flap switch is moved to down?
- LE devices are hydraulically driven to full extended position (cannot be retracted)
- TE flaps are electrically extended
What protections are provided by the flap/slats electronics unit (FSEU)?
- Asymmetry
- Skew
- Uncommanded motion
What is the STAB TRIM OVERRIDE switch used for?
Bypasses the control column actuated stabilizer trim cutout switch to restore power to the stabilizer trim switches
