Flight Controls Flashcards
Which hydraulic system(s) can power all primary flight controls?
Both A and B.
SH 9.010 pg 2
STBY - just rudder and LE devices + thrust reversers
What are the secondary flight controls?
High lift devices - trailing edge flaps, LE devices (flaps & LE slats)
Drag devices - speedbrakes
Roll augmentation - spoilers
SH 9.010 pg 3
The Trailing Edge Flaps and Leading Edge Devices are normally powered by:
the Trailing Edge Flaps and LEDs are powered by Hydraulic System B
SH 9.010 pg 3
How does placing a FLT CONTROL switch to STBY RUD affect the flight control panel lights?
STBY RUD ON light illuminates Arms STBY HYD LOW PRESSURE light Respective flight control LOW PRESSURE light extinguishes If B system, YAW DAMPER will illuminate SH 9.010 pg 5
How would a single channel failure of the Speed Trim system be indicated?
SPEED TRIM FAIL light during recall only
STS uses two FCCs (dual channel) - so you won’t get an indication unless both FCCs are incapable of providing the STS function
SH 9.010 pg 20
Which system(s) help in identifying and controlling stalls? YESS CAS
Yaw Damper Elevator Feel Shift (EFS) Module Speed Trim System Stall Management Yaw Damp Computer (SMYDs) calculate PLIs Also Autoslats SH 9.010 pg 22
What do the SMYD computers use to determine when a stall warning is necessary?
WAAAT FMA
AOA Sensor outputs ADIRU outputs Anti-ice controls Wing configurations Air/ground sensing Thrust FMC outputs Mach compensation SH 9.010 pg 23
How would a single channel failure of the Mach Trim system be indicated?
MACH TRIM FAIL during recall only
SH 9.010 pg 12
Can the Speed Trim System be overridden? If so, how?
Yes, by…use of electric trim or manual rotation of either Stabilizer Trim Wheel STS works when… Airborne for 10+ seconds No manual trim prior 5 seconds Senses a need for trim A/P disengaged SH 9.010 pg 20
What is the purpose of the stall warning “Stick Shaker”?
Designed to alert the pilots before a stall develops.
SH 9.010 pg 22
What is required to activate the Main Yaw Damper?
Hydraulic System B pressure,
the B FLT CONTROL switch in the ON (guarded) position,
and no fault detected by SMYD computers
SH 9.010 pg 31
How are the Rudder, Ailerons, and Elevators operated in Manual Reversion?
Manually
Ailerons and elevator - mechanically with cables
Rudder - STBY hydraulic system (NOT CABLES)
But there are No Protections
SH 9.010 pg 5
What would cause the Speed Brake lever to automatically stow after deployment on landing
or RTO?
Either thrust lever advancing (think touch and go)
SH 9.010 pg 38
How is roll controlled with jammed spoilers? Jammed ailerons?
Ailerons jammed = FO side only controls roll with SPOILERS FAS
Spoilers jammed = Captain side only controls roll with AILERONS CAS
SH 9.010 pg 10 - Aileron Transfer Mechanism\
How is the horizontal Stabilizer Trim normally powered? Is there an alternative way?
main electric trim motor (either with switch or autopilot)
alternative way - manually rotating the trim wheel
SH 9.010 pg 15
Through the use of the Alternate Flaps UP/DOWN switch, how are the Leading Edge Devices
and Trailing Edge Flaps operated?
LE devices are hydraulic using standby system and cannot be retracted
Trailing edge flaps revert to electrical operation (very slow)
SH 9.010 pg 51
What is the purpose of the flap load relief system?
- protects the trailing edge flaps from excessive loads/overspeed
- retracts flaps automatically to next lower setting until speed decreases, automatically re extends flaps to selected setting.
flaps >10
SH 9.010 pg 49
What protections are provided during an alternate flap extension?
No protections - you lose asymmetry and skew protections + more
SH 9.010 pg 52
What is the purpose of the LE FLAPS TRANSIT light on the main panel, below the Trailing
Edge Flaps indicator?
LE FLAPS TRANSIT - in transit or disagree with scheduled position
AND during alternate flaps extension until LE devices are fully extended and TE flaps reach 15
SH 9.010 pg 39
How is the Standby Yaw Damper activated?
Must be in manual reversion - both FLT CONTROL switches positioned to STBY
RUD
YAW DAMPER switch reset to ON
(This is the one where he said that if you JUST have a YD failure, it’s much better to fly without a YD than to put ALL your controls into manual reversion just to activate the standby YD)
SH 9.010 pg 32
When will the SPEEDBRAKES EXTENDED light illuminate?
in flight - SPEED BRAKE lever beyond the ARMED position with TE Flaps
extended more than Flaps 10 OR radio altitude less than 800 ft
on the ground - Speed brake panels still out with the handle stowed (disagree)
NOTE: On the ground, the SPEEDBRAKES EXTENDED light does not illuminate
when Hydraulic System A pressure is less than 750 psi.
SH 9.010 pg 35
What is the light logic on the Leading Edge Devices annunciator panel on the Aft Overhead?
Position status of individual LE flaps/slats GREEN = position YELLOW = in transit EXTINGUISHED = retracted SH 9.010 pg 38
