Flight Controls

Question 1

Which hydraulic system(s) normally power the primary flight controls?

Answer 1

System A or B can operate all of the primary flight controls.

The active system is determined by the active FCC, determined by:

• Side of active autopilot, or
• Side which activated the flight director first

A small green annunciator exists on the MCP, “MA”

Captain side –> system A
FO side –> system B

Question 2

Loss of hydraulic systems A and B render which spoiler panels inoperative?

Answer 2

The loss of both A and B hydraulic systems is manual reversion and therefore renders ALL spoiler panels inoperative

Question 3

How do ailerons and elevators operate with the loss of both hydraulic system A and B?

Answer 3

The ailerons and elevators are operated through mechanical linkage

Question 4

What happens when the FLT CONTROL A switch is positioned to STBY RUD?

Answer 4

Standby hydraulic system activated, and

Opens the standby rudder shutoff valve (allowing standby hydraulics to power the standby rudder PCU)

Question 5

What powers the rudder during manual reversion?

Answer 5

Standby hydraulic system

Question 6

What are the roll control surfaces? How are they powered?

Answer 6

Ailerons and roll spoilers

Both are hydraulically powered [ailerons do have manual reversion]

Question 7

What happens when a single aileron trim switch is pushed?

Answer 7

Nothing, both trim switches have to be pushed in the same direction to activate the trim

Question 8

Why is aileron trim prohibited with the autopilot engaged?

Answer 8

It can result in an out-of-trim condition when the autopilot is disengaged

Question 9

How many degrees of control wheel displacement initiates spoiler deflection?

Answer 9

Spoiler deflection is initiated at approximately 10 degrees of control wheel displacement

Question 10

Which flight control switch(es) are used for maintenance purposes only?

Answer 10

The SPOILER A/B switches are used for maintenance purposes only

Question 11

With a jammed/restricted aileron or roll spoiler system, how is roll controlled?

Answer 11

If the ailerons or spoilers are jammed, force applied to the captain’s or first officer’s control wheels will identify which system is usable

Captain’s yoke –> ailerons
FO’s yoke –> spoilers

Question 12

What does an illuminated FEEL DIFF PRESS light (amber) indicate?

Answer 12

Excessive differential pressure within the elevator feel computer

Question 13

How does actuating the stabilizer trim switch on the control wheel affect autoflight?

Answer 13

Automatically disengages the autopilot

Question 14

What is the purpose of the STAB TRIM switches on the aft electronic panel?

Answer 14

Switch to Override and then electric trim works regardless of yoke position

Question 15

What does the green band on the STAB TRIM indicator mean?

Answer 15

Takeoff trim range

A takeoff warning horn sounds if the stab trim is outside this range during takeoff

Question 16

What does an illuminated SPEED TRIM FAIL light (amber), during MASTER CAUTION recall, indicate?

Answer 16

Failure of a single channel of the speed trim system

Question 17

Describe the functions of the Stall Management Yaw Damper (SMYD) computers

Answer 17

Stall warnings,

• Stick shaker,
• Pitch limit indicator and airspeed tape warnings, and
• GPWS windshear detection and alert

Yaw damping

Question 18

Which light is armed by selecting FLT CONTROL A or B switch to STBY RUD?

Answer 18

LOW PRESSURE for standby hydraulics

Question 19

During landing, when do ground or flight spoilers deploy?

Answer 19

Wheel spin for flight spoilers,

Right main gear compress for ground spoilers

Question 20

What would cause the LE FLAPS TRANSIT light (amber) to illuminate?

Answer 20

Any LE device in transit, or

Any LE device not in programmed position with respect to TE flaps, or

LE uncommanded motion, or

LE devices not in commanded position

Question 21

When does the main rudder PCU limit full rudder authority?

Answer 21

Speed > 135kts

If you are OEI then full rudder authority is available

Question 22

What does the rudder trim control switch do?

Answer 22

Rudder is electrically trimmed in the desired direction

Question 23

What flap settings have flap load relief?

Answer 23

Flaps 10-40

Question 24

How do you activate the standby yaw damper?

Answer 24

Both FLT CONTROL A and B switches to STBY RUD

Question 25

What are the positions of the speed brake lever? Limitations?

Answer 25

Down,
Armed,
Flight Detent,
UP

In flight, do not go beyond Fight Detent

Do not use speed brakes with flaps extended (ASA lim)

Question 26

What does the SPEED BRAKE DO NOT ARM light (amber) indicate?

Answer 26

Abnormal condition or test inputs to the automatic speed brake system

Question 27

What is the normal position for LE flaps for each FLAP lever position?

Answer 27

Full extend for flaps 1-40

[Question said LE flaps not LE slats/devices]

Question 28

When do LE slats deploy to FULL EXTEND?

Answer 28

SFP aircraft
Beyond flaps 25

Non-SFP aircraft
Beyond flaps 5

Question 29

When and how do the auto slats operate?

Answer 29

When the aircraft approaches stall and the LE slats are in the extend position, the LE slats fully extend

Question 30

What does an AUTO SLAT FAIL light (amber) illumination during Master Caution Recall indicate?

Answer 30

Failure of a single stall management yaw damper (SMYD) computer

Question 31

Which devices move when the alternate flaps switch is placed in the DOWN position? UP position? Which system(s) move these devices?

Answer 31

DOWN - LE devices and TE flaps
UP - TE flaps (LE devices only if you have B hydraulics)

Leading edge devices - standby hydraulics
Trailing edge flaps - electric motor