737 Flight Controls

FCTRL 023 Explain the Positions of the Speed Brake Lever. (DOWN, ARMED, FLIGHT DETENT, UP, 50%)

DOWN (detent) - • all flight and ground spoiler panels in faired position. ARMED - • automatic speed brake system armed (illuminates SPEEDBRAKE ARMED light.) • upon touchdown, the SPEED BRAKE lever moves to the UP position, and all flight and ground spoilers extend. FLIGHT DETENT - • all flight spoilers are extended to their maximum position for inflight use. UP - • all flight and ground spoilers are extended to their maximum position for ground use. 50% (as modified) - • if the speed brakes are deployed beyond the 50% position and the speedbrake load alleviation feature is activated: 1. the speed brake lever moves to the 50% position. 2. all flight spoilers retract to one-half of their maximum position for inflight use. - See Side 3 -

Speedbrake altitude restriction?

Do not use the speedbrakes in flight at radio altitudes less than 1,000 feet.

FCTRL 025 Describe the Speed Brake system during ground operations. (i.e., during landing and rejected takeoff).

During landing, the auto speed brake system operates when these conditions occur: 1. SPEED BRAKE lever is in the ARMED position. 2. SPEED BRAKE ARMED light is illuminated. 3. landing gear strut compresses on touchdown. 4. both thrust levers are retarded to IDLE. 5. main landing gear wheels spin up. The SPEED BRAKE lever automatically moves to the UP position and the spoilers deploy. 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. 2. both thrust levers are retarded to IDLE. 3. reverse thrust levers are positioned for reverse thrust. The SPEED BRAKE lever automatically moves to the UP position and spoilers deploy. Note: After an RTO or landing, if either thrust lever is advanced, the SPEED BRAKE lever automatically moves to the DOWN detent and all spoiler panels retract. The spoiler panels may also be retracted by manually moving the SPEED BRAKE lever to the DOWN detent.

FCTRL 004 Explain the meaning of an amber LE FLAPS TRANSIT light.

1. any LE device in transit. 2. any LE device not in programmed position with respect to TE flaps. 3. a LE slat skew condition exists. 4. 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.

Maximum Flap Extension Altitude?

20,000 ft.

737 Flight Controls

737 Flight Controls There are 19 LOD questions in this section; they're not in order. Limitations and restrictions are added.

Holding flap restriction?

Holding in icing conditions with flaps extended is prohibited.

FCTRL 019 Explain the function of the ALTERNATE FLAPS Master Switch.

OFF (guarded position) - normal operating position. ARM - 1. closes TE flap bypass valve, 2. activates standby pump, and 3. arms the ALTERNATE FLAPS Position Switch.

Alternate Flap Duty Cycle?

Alternate flap duty cycle: • When extending or retracting flaps with the ALTERNATE FLAPS position switch, allow 15 seconds after releasing the ALTERNATE FLAPS position switch before moving the switch again to avoid damage to the alternate flap motor clutch. • After a complete extend/retract cycle, i.e., 0 to 15 and back to 0, allow 5 minutes cooling before attempting another extension.

FCTRL 014 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.

FCTRL 003 Explain the meaning of the SPEED BRAKES EXTENDED light.

In flight - • SPEED BRAKE lever is beyond the ARMED position, and 1. TE flaps extended more than flaps 10, or 2. Radio altitude less than 800 feet. On the ground - • SPEED BRAKE lever is in the DOWN detent, • Ground spoilers are not stowed. - See Side 3 -

In flight speedbrake use restriction?

In flight, do not extend the speedbrake lever beyond the FLIGHT DETENT.

side 3

In flight, do not extend the speedbrake lever beyond the FLIGHT DETENT.

FCTRL 012 Explain the meaning of the SPEED BRAKE DO NOT ARM light.

Indicates abnormal condition or test inputs to the automatic speed brake system. (Light deactivated when SPEED BRAKE lever is in the DOWN position)

FCTRL 006 Explain the meaning of the FEEL DIFF PRESS light.

Indicates excessive differential pressure in the elevator feel computer. - See Side 3 -

FCTRL 009 Explain the meaning of the AUTO SLAT FAIL light.

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.

FCTRL 008 Explain the meaning of the MACH TRIM FAIL light.

Indicates failure of the mach trim system. Indicates failure of a single FCC channel when MASTER CAUTION light recall is activated.

FCTRL 007 Explain the meaning of the SPEED TRIM FAIL light.

Indicates failure of the speed trim system. Indicates failure of a single FCC channel when MASTER CAUTION recall is activated.

FCTRL 005 Explain the meaning of an illuminated Flight Control LOW PRESSURE light.

Indicates low hydraulic system (A or B) pressure to ailerons, elevator and rudder.

FCTRL 013 Explain the function of the Flight Control (FLT CONTROL) switches located on the Forward Overhead panel.

STBY RUD - 1. activates standby hydraulic system pump, and 2. 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.

FCTRL 002 Recall the phase of flight that the Speed Trim System operates most frequently.

STS operates most frequently during takeoffs, climb and go-arounds.

FCTRL 024 Explain the function of the Speedbrake Load Alleviation Feature.

The automatic speed brake load alleviation feature limits the deployment of the speed brakes under certain high gross weight/airspeed combinations. Under these conditions, if the speed brakes are deployed to the FLIGHT DETENT, they automatically retract to 50 percent of the FLIGHT DETENT. The SPEED BRAKE lever moves to reflect the position of the speed brakes. Manual override is available. Increased force is needed to move the SPEED BRAKE lever beyond the 50 percent position with load alleviation active. The SPEED BRAKE lever must be held in place when manual override is used between 50 percent and the FLIGHT DETENT.

side 3

The elevator feel computer provides simulated aerodynamic forces using airspeed (from the elevator pitot system) and stabilizer position. Feel is transmitted to the control columns by the elevator feel and centering unit. To operate the feel system the elevator feel computer uses either hydraulic system A or B pressure, whichever is higher. When either hydraulic system or elevator feel pitot system fails, excessive differential hydraulic pressure is sensed in the elevator feel computer and the FEEL DIFF PRESS light illuminates.

FCTRL 017 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.

FCTRL 018 Recall that the 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.

FCTRL 016 Explain how the Flap Load Relief system operates.

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. - See Side 3 -

FCTRL 010 Explain the meaning of the YAW DAMPER light.

Yaw damper is not engaged.