FLIGHT CONTROLS

Question 1

Which hydraulic system(s) can power all primary flight controls?

Answer 1

Normally, hydraulic system A and B power the flight controls redundantly; however, the primary flight controls may be operated with only system A or B.

Question 2

How are the primary flight controls operated in manual reversion?

Answer 2

With the loss of hydraulic system A and B, the ailerons and elevators are operated manually and the rudder is operated using the standby hydraulic system. This is referred to as manual reversion.

Question 3

Which hydraulic system(s) power the trailing edge flaps and leading edge devices?

Answer 3

The TE flaps and Leading Edge Devices (LEDs) are normally powered by hydraulic system B.

Question 4

How is roll controlled with a jammed aileron?

Answer 4

Through the aileron transfer mechanism. If the aileron control system is jammed, force applied to the First Officer’s control wheel provides roll control from the spoilers.

Question 5

How is pitch controlled with a jammed elevator?

Answer 5

An override mechanism allows the control columns to be physically separated from one another. Applying force against the jam will breakout either the Captain’s or First Officer’s control column, freeing one to provide adequate elevator control.

Question 6

What does the illumination of the SPOILERS light indicate?

Answer 6

Illumination of the SPOILERS light on the Flight Control panel indicates the Spoiler Control Electronics unit has identified a spoiler system fault.

Question 7

What happens when placing a FLT CONTROL switch to STBY RUD?

Answer 7

Placing a FLT CONTROL switch to STBY RUD activates the standby hydraulic system pump and opens the standby rudder shutoff valve to pressurize the standby rudder power control unit.

With the FLT CONTROL switch in STBY RUD, the associated FLT CONTROL LOW PRESSURE light is deactivated, and the STANDBY HYD LOW PRESSURE light is armed.

Question 8

How is the Elevator Jam Landing Assist activated?

Answer 8

To activate the system, the ELEVATOR JAM LANDING ASSIST switch must be selected ON and the actual TE flap position must be 1 or greater with the autopilot disengaged.

Question 9

How is horizontal stabilizer trim operated?

Answer 9

The horizontal stabilizer is positioned by a single electric motor controlled by either stabilizer trim switches on the control wheel, or by autopilot trim. The stabilizer may also be positioned by manually rotating the stabilizer trim wheel.

Question 10

How is MCAS inhibited?

Answer 10

MCAS may be inhibited by positioning either stabilizer trim cutout switch to CUTOUT or by forward control column cutout switches.

Question 11

How is a failure of the Speed Trim or MCAS function indicated?

Answer 11

Illumination of the SPEED TRIM FAIL light indicates failure of the STS (Speed Trim function or MCAS function).

Question 12

Can the Speed Trim System be overridden? If so, how?

Answer 12

Yes, the Speed Trim System may be overridden by actuation of the control wheel trim switches (inhibits further Speed Trim operation for 5 seconds) or manual rotation of either stabilizer trim wheel.

Question 13

Which system(s) help in identifying stalls and assist in control should one occur?

Answer 13

Stall identification and control is enhanced by the yaw damper, the Elevator Feel Shift (EFS) module, and the STS by helping identify and prevent further movement into a stall condition.

Question 14

When is rudder limiting active?

Answer 14

With both engines operating and airspeed above approximately 135 kts.

Question 15

What is required for the main yaw damper to operate?

Answer 15

The main yaw damper is powered when the YAW DAMPER switch on the Flight Control panel is selected ON and hydraulic system B is powered with the B FLT CONTROL switch positioned to ON.

Question 16

What is the purpose of the Landing Attitude Modifier?

Answer 16

Nose gear clearance and drag. Speedbrakes symmetrically deploy to create additional drag for slowing
and to reduce lift and force the aircraft to have a higher angle of attack.

Question 17

When is emergency descent speedbrake active?

Answer 17

EDS is armed when above 30,000 ft and the cabin altitude warning is active. EDS is activated automatically by moving the SPEED BRK lever when the system is armed.

Question 18

Under what conditions will the speedbrakes stow automatically?

Answer 18

After RTO or landing, if either thrust lever is advanced, the SPEED BRK lever automatically moves to the DOWN detent and all spoilers retract.

Question 19

When does the SPEEDBRAKES EXTENDED light illuminate?

Answer 19

In flight if the SPEED BRK lever is beyond the ARMED detent and any of the following conditions exist:

• A thrust lever is greater than 40° for more than 3 seconds or idle for more than 15 seconds, or
• TE flaps extended more than Flaps 10, or
• Radio altitude less than 800 ft

The light illuminates on the ground if the SPEED BRK lever is in the DOWN detent and hydraulic pressure (750 psi or greater) is sensed in the ground spoiler extend line, suggesting the spoiler panel may not be stowed.

Question 20

When does the PFD warning SPEEDBRAKE along with an aural alert activate?

Answer 20

If the speedbrakes do not deploy after landing or rejected takeoff above 80 kts, the EGPWS provides a SPEEDBRAKE warning on the PFD as well as an aural “SPEEDBRAKE, SPEEDBRAKE” alert.

Question 21

When does the LE FLAPS TRANSIT light illuminate?

Answer 21

During extension of the LE devices, the amber transit lights of the associated LE device illuminates while the device is in motion. The LE FLAPS TRANSIT light also illuminates any time the LE devices are in motion or do not agree with the scheduled flap position.

Question 22

Which system(s) powers the alternate flap system?

Answer 22

The ALTERNATE FLAPS position switch controls an electric motor that extends or retracts the TE flaps.

The LE devices are extended using the standby hydraulic system.

Question 23

Are there flap protective systems available during an alternate flap extension?

Answer 23

No. There is no asymmetry, LE uncommanded motion, or skew protection during an alternate flaps extension.

Question 24

What is the purpose of the flap load relief system?

Answer 24

Flap load relief protects the TE flaps from excessive air loads. When the Captain’s indicated airspeed exceeds the load relief speed, the TE flaps will retract one flap setting below the selected FLAP lever position.