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NEW Alaska B737 Systems > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

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

A

Either hydraulic system A or B

Standby hydraulics only power
-Rudder
-Standby yaw damper
-LED extension
-Thrust reversers

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2
Q

What are the secondary flight controls?

A

High lift devices (flaps/slats)

Drag devices (speedbrakes)

Roll augmentation (spoilers)

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3
Q

Flaps and Slats are normally powered by? Alternate power source?

A

Hydraulic system B

Alternate power sources

TE flaps
–Electric motor

LEDs
–Standby hydraulics (extension), or
–PTU
—-Autoslats
—-LED retraction w/ low HYD sys B pressure

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4
Q

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

A

Activates standby hydraulic system
–STBY RUD ON illuminates
–Arms LOW QUANTITY (<50%) light

Opens standby rudder shutoff valve

Inhibits respective FLT CONTROL LOW PRESSURE light

Yaw damper disengages if system B

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5
Q

What is Speed Trim? What does it provide?

A

Speed stability system

Returns aircraft to a trimmed speed (using stabilizer trim)

High AOA stall protection

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6
Q

What are the significant conditions required for Speed Trim to operate?

A

A/P not engaged

Airborne +10 sec

Electric trim switch release +5 sec

Flaps extended, or gear retracted, or CAS < 226kts

*operates mostly during takeoff, climb, go-around
*low speed, weight, aft CG, high thrust

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7
Q

What are the indications of a Speed Trim System fault/failure?

A

SPEED TRIM FAIL (amber)
Speed trim has failed

Dual channel system, on RECALL then only a single channel has failed

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8
Q

Which system(s) help in identifying and controlling stalls?

A

Stall Management Yaw Damper (SMYD) computers
-Stick shaker
-Pitch Limit Indicators (PLIs)
-Yaw damper reduced

Speed Trim
-Trims stabilizer nose down

Elevator Feel Shit
-Increases control column forces

Yaw Damper
-Rudder movement reduced by SMYD

FMC BUFFET ALERT

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9
Q

What does the SMYD computer use to determine a stall warning is necessary?

A

AOA
ADIRUs
Anti-Ice position
Wing configuration
Thrust
FMC outputs
Mach compensation
Air/ground logic

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10
Q

What is Mach Trim? What does it provide?

A

Speed stability system

Compensation for nose down (tuck) tendencies at higher Mach

Also, additional nose-up elevator during low-speed maneuvering

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11
Q

What are the indications of a Mach Trim fault/failure?

A

MACH TRIM FAIL (amber)
Mach trim system has failed

Dual channel system, on RECALL then only a single channel has failed

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12
Q

How can Speed Trim System be overridden? Inhibited?

A

Overridden by
-Electric trim (5 seconds)
-Manual trim

Inhibited by
-A/P engaged
-Control column cutout switches activated
-A/P STAB TRIM CUTOUT switch to CUTOUT
-Bank > 40*

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13
Q

What is the purpose of the stall warning “stick shaker”?

A

Alert the pilot before a stall develops

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14
Q

What is required to activate the main yaw damper? Standby yaw damper?

A

Main Yaw Damper
-Hydraulic system B pressure
-FLT CONTROL switch B is ON (normal, guarded position)
-SMYD(s)
-Yaw Damper switch ON

Standby Yaw Damper
-Both FLT CONTROL switches to STBY RUD
-Standby hydraulic pressure
-Yaw Damper switch recycled to ON

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15
Q

What would cause the speedbrake to automatically stow after deployment on landing or an RTO?

A

Thrust lever advancement (either)

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16
Q

How are the ailerons, elevators, spoilers, and rudder operated in Manual Reversion?

A

Ailerons – manually (captain yoke)
Spoilers – manually (F/O yoke)
Elevators – manually (both yokes control respective elevator)
Rudder – Standby Hydraulic system

17
Q

How is roll controlled with jammed spoilers? Ailerons?

A

Apply force to yokes

Captain has control of ailerons (jammed spoilers)

F/O has control of spoilers (jammed ailerons)

18
Q

How is the stabilizer trim normally powered? Alternately?

A

Electric trim motor (one), or

Manually rotating the stabilizer trim wheel

19
Q

Through the Alternate Flaps UP/DOWN switch, how are the LEDs and TE Flaps operated?

A

LEDs
-Standby Hydaulics
-FULL EXT only
-Once extended, cannot be retracted (unless HYD SYS B available)

TE Flaps
-Electric motor
-Slow flap transit (plan Flaps 15 landing)
-TE flaps capable of full extension**
-No asymmetry/skew/uncommanded motion protection
-No flap load relief

20
Q

What is the purpose of the flap load relief system?

A

Protects TE flaps from excessive air loads

Available for flaps 10-40 (SFP/900ER/MAX)
–Flaps 30/40 for -700 and -800/-900 non-SFP

Retracts one notch, and only one notch

Re-extension once slowed

21
Q

What protections are provided during an alternate flap extension?

A

None.

Protections lost
-Asymmetry
-Skew
-Uncommanded motion
-Flap load relief
-Autoslats/PTU

22
Q

What does LE FLAPS TRANSIT (amber) light indicate?

A

Any LE device is in transit, or
Any LE device not in correct position regarding TE flaps, or
LE uncommanded motion (2 or more LEDs)

Reprogrammed to FULL EXT/Flaps 15 for alternate flap extion

Inhibited during autoslat operation

23
Q

How is the Standby Yaw Damper activated?

A

Both FLT CONTROL switches position to STBY RUD

Yaw Damper switch recycled to ON

24
Q

When will the SPEEDBRAKES EXTENDED (amber) light illuminate?

A

Airborne
-Speed brake lever beyond armed, and
-Flaps > 10 or RA < 800’

Ground
-Speed brake lever DOWN, and
-Ground spoiler pressure >750psi (ground spoilers may be extended) Do not takeoff!

25
Q

What is the logic of the LEDs annunciator on the AFT overhead panel?

A

Position of individual LE flaps and slats

Green – EXT or FULL EXT
Amber – in-transit
Extinguished – retracted

26
Q

What does the AUTO SLAT FAIL (amber) light indicate?

A

Failure of the Auto Slat system, or

During RECALL failure of a SMYD

27
Q

What does the FEEL DIFF PRESS (amber) light indicate?

A

Excessive differential pressure in the Elevator Feel Computer

Usually caused by loss of pressure in a hydraulic system or elevator feel pitot system fails

NEW Alaska B737 Systems (16 decks)

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