Flight Controls

Question 1

YAW DAMPER Switch - when it can be engaged in ON?

Answer 1

Can be engaged in ON position if the B FLT CONTROL switch is in the ON position, or if both the A and B FLT CONTROL switches are in the STBY RUD position.
(FCOM 9.10.2)

Question 2

What is the meaning of SPEED BRAKE DO NOT ARM Light?

Answer 2

Airplanes without LAS:
Abnormal condition or test inputs to the automatic speed brake system, or during landing, indicates wheel speed has dropped below 60 kts, and the speedbrake lever is not in the DOWN position.
Airplanes with LAS:
Abnormal condition or test input to the speed brake load alleviation system when the flaps are raised, or during landing, indicates wheel speed has dropped below 60 kts, and the speedbrake lever is not in the DOWN position.
(FCOM 9.10.11)

Question 3

What is the meaning of SPEEDBRAKES EXTENDED Light?

Answer 3

In–flight -
1. SPEED BRAKE lever is beyond the ARMED position, and -
2. TE flaps extended more than flaps 10, or radio altitude less than 800 feet.
On the ground -
1. SPEED BRAKE lever is in the DOWN detent, and -
2. Ground spoilers are not stowed.
(FCOM 9.10.11)

Question 4

Leading Edge Flaps Transit (LE FLAPS TRANSIT) Light - what is the meaning?

Answer 4

1. Any LE device in transit;
2. Any LE device not in programmed position with respect to TE flaps;
3. A LE uncommanded motion condition exists (two or more LE flaps or slats have moved away from their commanded position);
4. During alternate flap extension until LE devices are fully extended and TE flaps reach flaps 10.
   (FCOM 9.10.16)

Question 5

How much the control wheel can be displaced before the flight spoilers begin to extend?

Answer 5

When the control wheel is displaced more than approximately 10°, spoiler deflection is initiated.
(FCOM 9.20.4)

Question 6

What is the Speed Trim System?

Answer 6

The Speed Trim System (STS) is designed to improve flight characteristics during operations with a low gross weight, aft center of gravity and high thrust when the autopilot is not engaged. The purpose of the STS is to return the airplane to a trimmed speed by commanding the stabilizer in a direction opposite the speed change.
Conditions:
1. STS Mach gain is fully enabled between 100 KIAS and Mach 0.60 with a fadeout to zero by Mach 0.68;
2. 10 seconds after takeoff;
3. 5 seconds following release of trim switches;
4. Autopilot not engaged;
5. Sensing of trim requirement.
(FCOM 9.20.9)

Question 7

What is FFM?

Answer 7

The main rudder PCU contains a Force Fight Monitor (FFM) that detects opposing pressure (force fight) between A and B actuators. This may occur if either system A or B input is jammed or disconnected. The FFM output is used to automatically turn on the Standby Hydraulic pump, open the standby rudder shutoff valve to pressurize the standby rudder PCU, and illuminate the STBY RUD ON, Master Caution, and Flight Control (FLT CONT) lights.
(FCOM 9.20.13)

Question 8

What are the conditions for Auto Speed Brake operation during landing?

Answer 8

1. SPEED BRAKE lever is in the ARMED position;
2. SPEED BRAKE ARMED light is illuminated;
3. Radio altitude is less than 10 feet;
4. Landing gear strut compresses on touchdown
   (Note: Compression of any landing gear strut enables the flight spoilers to deploy. Compression of the right main landing gear strut enables the ground spoilers to deploy);
5. Both thrust levers are retarded to IDLE;
6. Main landing gear wheels spin up (more than 60 kts).
   (FCOM 9.20.17)

Question 9

Will the Auto Speed Brake system operate if we land with the Speed Brake lever in down position?

Answer 9

If the SPEED BRAKE lever is in the DOWN position during landing or rejected takeoff, the auto speed brake system operates when these conditions occur:
1. Main landing gear wheels spin up (more than 60 kts);
2. Both thrust levers are retarded to IDLE;
3. Reverse thrust levers are positioned for reverse thrust.
(FCOM 9.20.17)

Question 10

What is the sequencing of the LE devices in the SFP airplanes and in the normal airplanes?

Answer 10

Normal:
When the FLAP lever is moved from the UP position to the 1, 2, or 5 position, the slates extend to extend position. Beyond 5 - full extend position.
SFP:
When the FLAP level is moved to: 1, 2, 5, 10, 15, or 25 position, the slates move to extend position. Beyond 25 - full extend.
(FCOM 9.20.19)

Question 11

Flap Load Relief: what is the difference in system’s operation in the SFP airplanes, and the rest?

Answer 11

“Normal” airplanes: the system operates for flaps 30 and 40 only.
SFP: This function is operative at the flaps 10, 15, 25, 30 and flaps 40 positions.
(FCOM 9.20.20)

Question 12

Auto Slat function - when it is operative?

Answer 12

The autoslat system is designed to enhance airplane stall characteristics at high angles of attack during takeoff or approach to landing. At flap positions 1, 2, and 5 (SFP: up to 25) an autoslat function is available that moves the LE slats to full extended if the airplane approaches a stall condition.
(FCOM 9.20.22)

Question 13

Alternate extension of the flaps - what are the asymmetry and skew protections that we have?

Answer 13

No asymmetry or skew protection is provided through the alternate (electrical) flap drive system.
(FCOM 9.20.22)