Flight Controls

Question 1

(756) Recall what will happen if you trim the stabilizer using the electric
pitch trim switches on the control wheel during single or multiple autopilot operation.

Answer 1

 If a single autopilot is engaged, electric (control wheel) trimming causes the autopilot to disengage

 If multiple autopilots are engaged, the electric (control wheel) trim switches are inhibited.

Question 2

(756) Recall what will happen if you trim the stabilizer using the alternate pitch trim switches on the pedestal while an autopilot is engaged.

Answer 2

 Alternate trimming DOES NOT cause autopilot disengagement.

 The UNSCHED STAB TRIM light will illuminate.

Question 3

(777, 400, 756, NG) Explain how the flap load relief system operates.

Answer 3

(B757s)
 If flaps 30 is selected and an overspeed occurs, the flaps will
retract to 25.
 The flaps will return to the flap lever selected position (30) once
the speed decreases below the flap placard limit speed.

(B767ERs) –
 If flaps 25 OR 30 is selected and an overspeed occurs, the flaps
will retract to 20.
 The flaps will return to the flap lever selected position (25 or 30)
once the speed decreases below flap placard limit speed

Question 4

(NG, 756, 400, 88) Recall the spoilers assist the ailerons in roll control in which configurations.

Answer 4

All configurations

Question 5

(756, 400) Recall the maximum flap setting directed by the QRH when
using the alternate flap and slat extension system.

Answer 5

Flaps 20

Question 6

(756) Describe the function of the ALTN FLAPS LE or TE switch.

Answer 6

 On the 757, selecting ALTN disables the normal control
(hydraulic pressure is removed from BOTH systems), and enables the selected alternate drive unit to operate.

 On the 767, selecting ALTN disables the normal control
(hydraulic pressure is removed from the SELECTED system only), and enables the selected alternate drive unit to operate.
 On the 767, the flap lever must be moved to hydraulically operate the system that still has hydraulics.

Note: Example: During a 767 TE flap disagreement, the QRH will direct the pilot to select the TE alternate flap switch. The trailing edge flaps will be controlled electrically with the ALTN FLAPS selector, but the
leading edges slats must still be controlled hydraulically using the flap lever.

Question 7

(756) Recall when leading edge slat asymmetry protection is provided on the 757.

Answer 7

At all times

Question 8

(756) Recall what protection is provided during normal flap / slat operation.

Answer 8

 LE and TE Asymmetry protection
 LE and TE Disagreement protection
 Flap Load Relief protection

Question 9

(756) Recall what occurs upon detection of a flap / slat asymmetry or
disagreement.

Answer 9

757
 Hydraulic power is automatically shut off to both the flaps and
slats.
 A LEADING EDGE or TRAILING EDGE light illuminates.

767
 Hydraulic power is automatically shut off only to the respective flaps or slats system.
 A LEADING EDGE or TRAILING EDGE light illuminates.

Note: The associated EICAS message can be used to determine the
fault in the system.(Asymmetry or Disagreement)

Question 10

(756) Understand when the outboard ailerons operate on the 767.

Answer 10

At low speeds

Question 11

(756) Recall the operation of the control column nudger on the 767

Answer 11

Warning of an impending stall is provided by the left and right stick shakers, which independently vibrate the left and right control columns. If the angle of attack continues to increase, and the flaps are in the retracted position, a control column nudger moves the control column forward. Both systems are energized
in flight and deactivated on the ground through air/ground logic.

Question 12

(756) Describe the operation of the rudder ratio system.

Answer 12

 Uses left hydraulic system pressure to reduce rudder deflection
(based on airspeed).
 The control commands from the rudder pedals and trim control are modified by a rudder ratio changer. As airspeed increases
the ratio changer desensitizes these inputs from the pilot to
reduce the rudder deflection. The ratio changer receives air data
computer airspeed inputs and provides control commands to an
actuator powered by the left hydraulic system. The actuator then dampens the pilots’ inputs to the rudder.

Question 13

(756) Explain the meaning of a STAB TRIM light.

Answer 13

The electric or alternate stabilizer trim rate is one-half the normal rate.

Question 14

(756) Explain the meaning of a SPOILERS light.

Answer 14

One or more spoiler pairs are inoperative or not in the signaled position.

Question 15

(756) Explain the meaning of an AUTO SPDBRK light.

Answer 15

A fault is detected in the auto speedbrake system.

Question 16

(756) Explain the meaning of an UNSCHED STAB TRIM light.

Answer 16

Uncommanded stabilizer motion is detected.

Note: Memory aid: “Wrong Way or Runaway Trim”

Question 17

(756) Explain the meaning of a LEADING EDGE light.

Answer 17

Illuminated (amber) –

• A slat disagree exists
• A slat asymmetry exists

Question 18

(756) Explain the meaning of an AIL LOCK (aileron lockout) light (767
only) .

Answer 18

The outboard aileron lockout actuator disagrees with the
commanded position.
- At low speed, the outboard ailerons should be unlocked.
- At high speed the outboard ailerons should be locked.

Question 19

(756) Explain the meaning of a TRAILING EDGE light.

Answer 19

Illuminated (amber) –

• A flap disagree exists.
• A flap asymmetry exists.
• The flap load relief system is not operating when required.

Note: This light may illuminate if the flap lever is not in a detent for an
extended period of time

Question 20

(756) Recall the meaning of a RUDDER RATIO light.

Answer 20

Illuminated (amber) – the rudder ratio system is failed or left hydraulic system pressure is not available.

Question 21

(756) Recall where to find the flap limit speeds.

Answer 21

A placard located around the periphery of the flap position indicator.

Question 22

(756) Recall when the alternate ALTN FLAPS selector is operable.

Answer 22

When either the ALTN FLAPS LE or TE switch is selected.

Question 23

(756) Explain the meaning of a YAW DAMPER INOP light.

Answer 23

Yaw Damper Inoperative (INOP) lights
 Illuminated (amber) – the yaw damper is off or inoperative.
Note: The INOP lights are illuminated anytime the IRUs are not aligned.

Question 24

(756) Explain the meaning of an illuminated MACH SPD TRIM light.

Answer 24

Illuminated (amber) – the mach / speed trim system is

inoperative.

Question 25

(756) Recall how the speedbrake is automatically deployed.

Answer 25

With the Speedbrake lever in the ARMED position:
- After landing, when both thrust levers are at idle, the speedbrake lever automatically moves to UP and the spoiler panels extend.
 With the Speedbrake lever in the DOWN (detent) position
- After landing, when either reverse thrust lever is raised to the reverse idle detent, the speedbrake lever moves to UP and the spoiler panels extend

Question 26

(756) Recall that manual speedbrake extension after landing results in immediate and full deployment of all spoiler panels.

Answer 26

Note: Care must be taken when manually deploying the speedbrakes
because a nose-up moment is created, which can result in a tail strike

Question 27

(756) Recall the meaning of an illuminated SPEED BRAKES light on the center forward panel.

Answer 27

Illuminated (amber) – the speedbrakes are extended when:
-The flaps are in a landing position
or
-The radio altitude is 800 feet or below