Ch.9 Flashcards
Flight Controls
Which Hydraulic System(s) normally power the primary flight controls?
System A and B. Either can operate all of the Primary Flight Controls
The loss of Hydraulic Systems A and B will render which spoiler panels inoperative?
All spoiler panels
How do ailerons and elevators operate with the loss of both Hydraulic systems A and B?
Manually through manual reversion. Mechanical throughput is provided through the PCU
What happens when the FLT CONTROL A switch is positioned to STBY RUD?
This activates the standby hydraulic system and opens the Standby rudder shutoff valve allowing standby hyd pressure to power the standby rudder PCU
What powers the rudder during manual reversion?
The standby hydraulic system. No manual reversion is available
Which are the roll control surfaces and how are they powered?
- Ailerons: HYD systems A & B through the Aileron Feel/Centering unit
- Flight spoilers: Connected by cables between the FO control wheel and spoiler PCU’s through the Spoiler Mixer. HYD Sys A & B are each connected to different spoiler pair to provide isolation
- Aileron Trim
*What happens when a single aileron trim switch is pushed?
Nothing?
Why is aileron trim prohibited with the autopilot engaged?
To prevent abrupt movements when the autopilot is disconnected
How many degrees of control wheel displacement initiates spoiler deflection?
Approx. 10*
Which flight control Switch (es) are used for maintenance purposes only?
Spoiler switches
With a jammed or restricted Spoiler system how is roll controlled?
Moving the captains control wheel will activate the Aileron transfer mechanism and roll will be provided by ailerons
With a jammed or restricted aileron system how is roll controlled?
Moving the F/O’s control wheel will activate the Aileron transfer mechanism and roll will
be provided by the spoilers
What does an illuminated FEEL DIFF PRESS light (amber) indicate?
Excessive differential pressure within the Elevator feel computer
How does actuating the Stabilizer trim switch on the control wheel affect autoflight?
Automatically disengages auto pilot
What is the purpose of the stab trim switch on the aft electronic panel?
To bypass the stabilizer trim cutout switches and restore power if both trim cutout switches have failed internally
What does the green band of the STAB TRIM indicator on the control stand indicate?
The take off trim range
What does an illuminated SPEED TRIM FAIL light (amber) during master caution recall
indicate?
Failure of a single FCC channel failure
Describe the functions of the Stall Management Yaw Damper (SMYD) computers.
Determine when stall warning is required based on: AOA sensors, ADIRU outputs, anti- ice controls, configuration, thrust, FMC outputs, and mach compensation. The SMYD computes a stick shaker AOA and compares it with actual AOA. When actual AOA exceeds computed AOA, the stick shaker fires
Which light is armed by selecting FLT CONTROL A or B switch to STBY RUD?
The standby hydraulic system Low Pressure light
When does the main rudder Power Control Unit (PCU) limit full rudder authority?
At speeds above approx. 135 KTS, pressures in both A & B are reduced by around 25% to limit full rudder authority in flight after takeoff and before landing
What does the rudder trim control switch do?
Electrically repositions the Rudder Feel/Centering unit which adjusts the rudder neutral position
How do you activate the standby yaw damper?
During manual reversion (loss of both HYD SYS A & B), both Flight Control switches are placed in STBY RUD, the yaw damper can then be reset to on and will be powered by the Standby hydraulic system
What are the positions of the speed brake lever and what are the limitations?
Down, armed, flight detent, up. Do not move the speedbrake past the flight detent in flight (Should be restricted by a lever stop when the flaps are fully retracted)
What does the SPEED BRAKE DO NOT ARM light (amber) indicate?
Abnormal condition or abnormal test inputs to the Automatic Speed Brake System
