Flight Controls Flashcards
1 RUD HYD
Indicates a loss of pressure at #1 rudder hydraulic actuator
RUD PRESS
Failure of rudder pressure regulator to reduce to 900psi above 140KTS (150KTS) OR Failure of rudder pressure regulator to increase to 1500PSI below 140KTS (150KTS) OR System pressure is 3000PSI and airspeed exceeds 140KTS (150KTS)
RUD FULL PRESS
Either rudder actuator is receiving 3000PSI above 140KTS (150KTS)
What does illumination of a RUDDER PUSH OFF SWITCH LIGHT indicate
A jam in the #1 or #2 actuator linkage
How does the STBY ELEV TRIM switch work
Guard is lifted which transfers control of pitch trim from AP to STDBY ELEVATOR TRIM SWITCHES
What does the SPLR 1 light indicate
Indicates a jam in the inboard roll spoiler. The SPLR 2 light is for the outboard spoiler
ROLL SPLR INBD HYD
Indicates a loss of hydraulic pressure in the related roll spoiler circuit
What flight controls does the Pilots wheel control
Spoilers
What flight controls does the Co-Pilots wheel control
Ailerons
FLAP DRIVE
Failure of the Primary shaft. Flaps continue to operate using the secondary shaft
FLAP POWER
Loss of hydraulic power to FPU.
At what pressure will the FLAP POWER light come on
Less than 1500PSI
When exposed to wind gusts what is the maximum speed of the gusts before an inspection is required
61KTS
What degree of travel is allowed through the Nose Steering tiller
60 degrees either side
What degree of travel is allowed with only rudder pedals
16 degrees LEFT and 18 degrees RIGHT
How much can the rudder trim displace the rudder
10 degrees either side
How is the rudder connected
Fore rudder is hinged to the vertical stabiliser and is moved by both actuators. Trailing rudder geometrically geared to fore rudder (twice the deflection)
What controls hydraulic pressure with respect to the rudder
Pressure to each actuator is controlled by a Pressure Regulator that is connected to a Summing Unit upstream.
What signals does the rudder pressure regulator use
Speed signals from the ADCs
Other than a predetermined speed, how is the caution light RUD PRESS activated
There are pressure switches that are armed by the ADC speed signals in each actuators supply line
What does pushing an illuminated PUSH OFF RUD 1 switch do
Depressurises the affected hydraulic actuator
When is maximum fore rudder travel allowed
At flap settings of 15 and 35 degrees
A mechanical rudder travel restrictor limits fore rudder travel to ____ with flaps at ____ degrees
12 degrees, 0 degrees
Can the AP be engaged without the YD
No
How much authority over the rudder does the YD have
5 degrees
Can the YD be engaged without the AP
Yes
Which side controls the Left Elevator
Pilots side
How do the Elevators function
Each elevator has a torsion spring which drives the elevator surface in conjunction with a spring tab which reduces control forces
What provides Elevator Trim
Tabs on each surface outboard of the spring tabs. Driven by a Trim wheel in the cockpit
How does the Elevator trim work
Movement of the wheel sends a signal to the AP Trim Servo which moves the elevator
How are the Spoilers controlled
Cable activated and hydraulically powered
What are Aileron Tabs and how do they work
They are geared tabs on the trailing edge of each aileron that assist aileron deflection. The tabs are geared to move in the opposite direction (create a localised lifting force) to the aileron to assist in movement of the aileron
How is Aileron Trim achieved
Through an electric actuator built into the right Aileron trim tab
How do the Spoilers work
They respond differentially to control wheel movement
Above ____KTS the _____ spoilers are inhibited
140KTS (150KTS), outboard
If a roll spoiler jam occurs during a turn and the ROLL DISC handle is pulled, this may result in a partially extended spoiler. If the resultant counteracting aileron input is more than ____ the ____ switch light will illuminate
50 degrees, SPLR
What is the maximum roll spoiler displacement with the ROLL DISC handle pulled
75 degrees
What type of Wing Flaps are fitted to the DHC-8
Single slotted fowler flaps
How are the flaps extended and retracted
A primary drive system which is actuated by a hydraulically powered Flap Power Unit (FPU) extends and retracts in response to flap selections
Sensors in the flap selector provide flap selection to ____, ____ and ____
Landing Gear warning system, GPWS and AP lift computer
How does the FPU work
- Trigger is raised on the flap selector 2. Solenoid shutoff valve opens and admits hydraulic pressure to the FPU. 3. Valve remains open for 70 secs to allow FPU time to position flaps 4. A control valve is positioned by flap selector 5. Hydraulic motor (#1 system) in FPU rotates primary shaft through a gearbox 6. Travel limiting mechanism halts flap movement when desired position is attained
Why would FLAP POWER caution light illuminate
Less than 1500PSI detected by a pressure sensor which is armed by the opening of the solenoid shutoff valve
How many shafts drive the flaps
2, a primary and a secondary
