Flight Controls Flashcards
Explain the meaning of the SPEED BRAKES EXTENDED light.
In flight (3) On ground (2)
In flight –
- SPEED BRAKE lever is beyond the ARMED position, and
- TE flaps extended more than flaps 10, or
- Radio altitude less than 800 feet.
On the ground –
- SPEED BRAKE lever is in the DOWN detent,
- Ground spoilers are not stowed.
Recall the phase of flight that the Speed Trim System operates most frequently.
-STS operates most frequently during takeoffs, climb and go-arounds.
Explain the meaning of an amber LE FLAPS TRANSIT light.
4
- any LE device in transit.
- any LE device not in programmed position with respect to TE flaps.
- a LE slat skew condition exists.
- illuminated during alternate flap extension until LE devices are fully extended and TE flaps reach flaps 10.
Note: Light is inhibited during autoslat operation in flight.
Explain the meaning of an illuminated Flight Control LOW PRESSURE light.
(1)
- Indicates low hydraulic system (A or B) pressure to ailerons, elevator and rudder.
Explain the meaning of the FEEL DIFF PRESS light.
1
-Indicates excessive differential pressure in the elevator feel computer.
Explain the meaning of the SPEED TRIM FAIL light.
2
- Indicates failure of the speed trim system.
- Indicates failure of a single FCC channel when MASTER CAUTION recall is activated.
Explain the meaning of the MACH TRIM FAIL light.
2
- Indicates failure of the mach trim system.
- Indicates failure of a single FCC channel when MASTER CAUTION light recall is activated.
Explain the meaning of the AUTO SLAT FAIL light.
2
- Indicates failure of the auto slat system.
- Indicates failure of the auto slat function in one of the SMYD computers when MASTER CAUTION light recall is activated.
Explain the meaning of the YAW DAMPER light.
Yaw damper is not engaged.
Explain the meaning of the SPEED BRAKE DO NOT ARM light.
When armed, Indicates abnormal condition or test inputs to the automatic speed brake system. Light deactivated when SPEED BRAKE lever is in the DOWN position.
Explain the function of the FLT CONTROL switches located on the Forward Overhead panel.
ON
OFF
STBY RUD
STBY RUD – activates standby hydraulic system pump and opens standby rudder shutoff valve to pressurize standby rudder power control unit.
OFF – closes flight control shutoff valve, isolating ailerons, elevators and rudder from associated hydraulic system pressure.
ON (guarded position) – normal operating position.
Explain the function of the Control Column Stabilizer cutout switches.
Control column actuated stabilizer trim cutout switches stop operation of the main electric and autopilot trim when the control column movement opposes trim direction.
Explain how the Flap Load Relief system operates.
30-40
25-30
When the flaps are set at 40, the TE flaps:
- retract to 30 if airspeed for flaps 40 is exceeded.
- re-extend when airspeed is reduced below flaps 40 speed.
When the flaps are set at 30, the TE flaps:
- retract to 25 if the airspeed for flaps 30 is exceeded.
- re-extend when airspeed is reduced below flaps 30 speed.
Explain how primary flight controls are powered.
The flight controls are powered by redundant hydraulic sources; system A and system B. Either hydraulic system can operate all primary flight controls. The ailerons and elevators may be operated manually if required. The rudder may be operated by the standby hydraulic system if system A and system B pressure is not available.
Recall that flight spoilers assist the ailerons in roll control.
The flight spoilers rise on the wing with up aileron and remain faired on the wing with down aileron. When control wheel is displaced more than approximately 10 degrees, spoiler deflection is initiated.