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737 MAX > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

Which hydraulic systems can power all primary flight controls?

A
  • Either A or B.
  • Normally, hydraulic system A and B power the flight controls redundantly; however the primary flight controls may be operated with only system A or B.
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2
Q

How are the primary flight controls operated in manual reversion?

A
  • The ailerons and elevators are operated manually via cable connections to the PCU’s, which then transmit force to the control surfaces without hydraulically boosting the force.
  • The rudder is operated by the Standby Hydraulic system, and the Yaw Damper is available.
  • The Spoilers are not available during manual reversion.
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3
Q

Which hydraulic systems power the trailing-edge flaps and leading-edge devices?

A
  • Normally the trailing edge flaps and leading-edge devices are powered by hydraulic system B.
  • If system B has failed, the leading-edge devices are extended via the standby hydraulic system, and the trailing-edge flaps are extended by an electric motor.
    o Once extended by the standby hydraulic system, the leading-edge devices may not be retracted.
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4
Q

4). How is roll controlled with a jammed aileron?

A
  • The aileron transfer mechanism allows the pilots to identify which roll control is jammed. With a jammed aileron, the First Officer controls roll by breaking through the jam and utilizing the flight spoilers for roll.
  • The ailerons and Captain’s control wheel are inoperative.
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5
Q

How is pitch controlled with a jammed elevator?

A
  • In the event of an elevator jam, an override mechanism allows the control columns to be physically separated from one another. Applying force against the jam will breakout either the Captains, or First Officer’s control column, freeing one to provide adequate pitch control.
  • Pitch control may also be assisted by use of the electric stabilizer trim.
  • With a jammed elevator, on the MAX, pitch control is assisted by the Elevator Jam Assist feature.
    o The Elevator Jam Landing Assist System uses the flight spoilers for small changes to the flight path.
    o To activate the system, the ELEVAOR JAM LANDING ASSIST switch must be selected ON and the actual TE flap position must be 1 or greater with the autopilot disengaged.
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6
Q

What does the illumination of the SPOILERS light indicate?

A

Illumination of the SPOILERS (amber) light indicates that the Spoiler Control Electronics Unit (SCE) has identified a spoiler system fault.

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7
Q

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

A
  • The flight control shutoff valve for that hydraulic system closes:
    o isolating ailerons, elevators, and rudder from the associated hydraulic system pressure.
  • Flight Control low pressure light illuminates (amber).
    o Master Caution
    o FLT CONT annunciator
  • Activates the standby hydraulic system pump.
  • Opens the Standby rudder shutoff valve.
    o allowing the standby hydraulic system to power the rudder.
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8
Q

How is the Elevator Jam Landing Assist activated?

A

To activate the system, the ELEVATOR JAM LANDING ASSIST switch must be selected ON and the actual TE flap position must be 1 degree or greater with the autopilot disengaged.

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9
Q

How is the horizontal stabilizer trim operated?

A
  • Normally operated by either:
    o Main Electric Trim
    o Autopilot Electric Trim
  • May be operated by the Manual Trim Wheel.
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10
Q

How is MCAS inhibited?

A
  • MCAS may be overridden by the control wheel electric trim switches, or
  • by either stabilizer trim wheel (manual trim).
  • MCAS may also be inhibited by positioning either stabilizer trim cutout switch to CUTOUT or,
  • by forward control column cutout switches.
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11
Q

How is a failure of the Speed Trim or MCAS function indicated?

A

Illumination of the SPEED TRIM FAIL (amber) light.

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12
Q

Can the Speed Trim system be overridden? If so, how?

A
  • Apply main electric trim.
  • Control column stabilizer trim cutout switches are activated (control column movement opposite the commanded trim direction).
  • Either Stabilizer Trim switch is positioned to cutout.
  • Stabilizer reaches trim limit (up or down).
  • Aircraft bank angle increases beyond 40 degrees.
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13
Q

Which systems help in identifying stalls and assist in control should one occur?

A
  • Yaw Damper.
  • Elevator Feel Shift Module (EFS).
  • Speed Trim System.
  • Auto-slat system.
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14
Q

When is rudder limiting active?

A
  • With both engines running and airspeed above 135 knots.
  • Rudder pressure will return to normal system operating pressure when:
    o an engine failure is detected, or
    o airspeed is reduced below approximately 132 knots with both engines operating.
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15
Q

What is required for the main yaw damper to activate?

A
  • Yaw damper switch selected ON.
  • Hydraulic system B is powered.
  • B FLT CONTROL switch positioned to ON.
  • IRS aligned.
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16
Q

What is the purpose of the Landing Attitude Modifier?

A
  • Increased nose gear clearance and drag.
  • With flaps 15-30 and thrust levers near idle, The Landing Attitude Modifier extends the speed brakes partially to create additional drag.
  • At flaps 30 and 40, the Landing Attitude Modifier deploys the flight spoilers to reduce lift. This additional drag requires a higher angle of attack to maintain lift, and therefore increases nose gear clearance.
17
Q

When is emergency descent speed brake active?

A
  • Emergency Descent Speed brakes are armed when the aircraft is above FL300 and the Cabin Altitude Warning is active.
  • EDS is activated automatically by moving the SPEED BRK lever when the system is armed.
    o EDS raises the speed brakes to a higher than normal position when the SPEED BRK lever is in the FLIGHT DETENT.
  • EDS is deactivated when the spoilers are stowed, or when the cabin altitude warning is no longer active.
18
Q

Under what conditions will the speed brakes stow automatically?

A

After a rejected take off, or landing, if either thrust lever is advanced, the Speed Brake lever automatically moves to the DOWN detent position and all spoilers retract.

19
Q

When does the SPEEDBRAKES EXTENDED light illuminate?

A
  • Illuminates for abnormal speed brake operation.
  • Illuminates in flight if the SPEED BRK lever is beyond the ARMED detent and any of the following conditions exist:
    o A thrust lever is greater than 40 degrees for more than 3 seconds or idle for more than 15 seconds, or
    o TE flaps extended more than flaps 10, or
    o Radio altitude less than 800 feet.
  • The SPEED BRAKE EXTENDED light also illuminates on the ground if the SPEED BRK lever is in the DOWN detent and hydraulic pressure (750 psi or greater) is sensed in the ground spoiler extend line, suggesting that the spoiler panel may not be stowed.
20
Q

When does the PFD warning SPEEDBRAKE (red) along with an aural alert activate?

A
  • If the speed brakes do not deploy after landing, or
  • if the speed brakes do not deploy after a rejected take off above 80 knots.
21
Q

When does the LE FLAPS TRANSIT light illuminate?

A
  • Any time the leading-edge devices are in motion, or do not agree with the scheduled flap position.
  • un-commanded motion of two or more LE devices.
22
Q

Which systems powers the alternate flap system?

A

The leading-edge devices are powered by the Standby hydraulic system, and the trailing edge flaps are powered by an electric motor.

23
Q

Are there flap protective systems available during an alternate flap extension?

A

No

24
Q

What is the purpose of the flap load relief system?

A
  • Protects the trailing edge flaps from excessive air loads.
  • When the Captains indicated airspeed is too high for the selected flap setting, Flap Load Relief activates and retracts the TE Flaps to the next lower setting below the selected Flap Lever position.
    o The flap lever does not move.
  • Reduction of airspeed below flap limit will cause Flaps to re-extend to selected flap lever position.
  • ie. Flap Blowback.
  • Flap load relief is available when flaps are selected to: 10,15,25,30 or 40 degrees.
  • Do not confuse with Load Alleviation system.

737 MAX (15 decks)

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