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MD88/90 Systems > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

How are ailerons Positioned and Powered

BOTH

A

Cable connected to aileron control tabs, and linked by torque tube so they move together

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2
Q

How are rudders positioned and powered?
What system is used if any?
BOTH

A

Hydraulically actuated by right hydraulic system but can be operated aerodynamically without HYD power

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3
Q

How are the elevators positioned and powered
88
90

Can they be split?
What messages if any?
What computer controls it? And what does it control?

A

88
- displaced by control tabs (one on each elevator) driven by cables independent of each side

90

  • hydraulically powered by both hyd systems with manual operation (not powered) capability
  • accomplished through the ACU which monitors pressure, controls 2 motor operated shut off valves and displays ELEV CONTROLS MANUAL message on OAP during man ops
  • two sides are connected by split torque tube allowing split with 150 lbs pressure
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4
Q

What is the HYD CONT ELEV
Is there a message with it?
switch used for on 90

A

It’s on the overhead panel and eliminates powered elevator control and establishes manual elevator control. ELEV CONTROLS MANUAL displayed on OAP

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5
Q

How are the elevators actuated in manual mode on the 90

A

A manual reversion mechanism operates a single control tab on each elevator, which is unlocked during manual ops.

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6
Q

What does a blue ELEVATOR AT LIMIT light on OAP mean on the 90

A

Indicates that the pylon flaps and the elevators have reached full down position, and also indicates for a full up position on the elevator

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7
Q

What is the hydraulic power augmented system on the 88 and how is it indicated

A

It provides elevator control for additional nose down capability in extreme, high angle of attack flight conditions(this system HYD displaces the elevators full down)
- indicated by ELEVATOR POWER ON blue light on OAP

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8
Q

What’s the purpose of the STABILIZER TRIM brake switch

A
  1. A red guarded switch on the aft pedestal is used to stop a runaway stabilizer caused by the primary trim motor
  2. When the switch is moved to STOP, Power is removed from the stab trim break
  3. Springs then force the break to clamp on the primary trim motor
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9
Q

What is the function of the STICK PUSHER PUSH TO INHIBIT switclight (white)

A
  1. It illuminates whenever the stick pusher is activated, and during the stall warning test
  2. When pressed, disengages the stick pusher and extinguishes the switch lights
  3. The stick pusher may be manually overridden by Pulling aft on the controls. However if stop persists and pressure is released the pusher will again force the column forward
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10
Q

When is the stick pusher inhibited

A

Red winshear warning light illuminated

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11
Q

What is the purpose of the RUD HYD CONT lever

PWR
MAN

A

The RUD HYD CONT lever

  1. PWR - allows hydraulic pressure to power the rudder Control tab in a faired position
  2. MAN - shuts off hydraulics to the rudder, unlocking the rudder control tab to respond to rudder pedal movement
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12
Q

What are the meanings of the SLATS advisory lights

T/O
DISAG
AUTO
LAND

A
  1. T/O - the FLAPS/ SLATS handle, flaps and the slats are in the take off range. Take off range of the flaps is 0-24°
  2. DISAG- The left and right wing slat positions do not agree with the handle position and or each other
  3. AUTO - The slats have automatically extended from mid to extend position in response to the stall warning system(auto slat)
  4. LAND - The FLAPS/SLATS handle, flaps and slats are in the landing range
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13
Q

What is the difference between the primary trim and the alternate trim

Both
88
90

A
  1. Operation of the primary trim control moves the stabilizer 1/3° per second

MD88 - operation of the alternate trim control moves the stabilizer 1/10° per second. The AlterNet trim motor is also used by the auto pilot

MD90 - operation of the alternate trim switches moves the stabilizer 1/5° per second. The alternate trim motor is also used by the auto pilot for longitudinal trim and Mach trim compensation

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14
Q

How do the spoilers assist the Ailerons in roll control

A
  1. And inboard and outboard spoiler on each wing supplement the ailerons for lateral control
  2. Wendy control wheel is rotated past 5° wheel angle, the flight spoilers start to extend on the downward moving wing
  3. Further control wheel movement extends the flight spoilers in proportion to lateral control demands
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15
Q

What effect does each position of the YAW DAMP switch have on system operation

OFF
ON
OVRD

A

OFF - YAW damper operation is disabled it auto pilot is disengaged. If auto pilot is engaged, YAW damper operation is automatically provided

ON - YAW damper operation is provided with auto pilot engaged or disengaged

OVRD - inhibits YAW damper operation with auto pilot engaged or disengaged

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16
Q

What is required for ground spoiler deployment on landing

A
  1. Throttles idle
  2. Either main wheel spun up or nose gear depression actuated ground shift
  3. System armed
  4. After landing. All spoilers our extended to a maximum of 60° to serve as ground spoilers
17
Q

What is required for automatic ground spoiler deployment during a rejected take off and how much will they deflect

A
  1. Throttles idle
  2. Thrust reverser a deployed
  3. Armed
  4. They will extend to 60° with reverse idle
18
Q

What’s the meaning of the seven take off warnings

FLAP
SLAT
BRAKES
AUTO BRAKES
SPOILERS
AUTO SPOILERS
STABILIZER
A

FLAPS - handle not in agreement with the value set in the FLAP window of the Takeoff condition computer

SLAT - slats are not extended

BRAKES - parking brake is set

AUTO BRAKE - spoiler/speed brake lever armed when auto brakes are not selected for take off

Spoilers - spoiler/speed brake lever not in the retract detent

AUTO SPOILERS - auto brakes selected for take off and spoiler/speed brake lever not armed

STABILIZER - horizontal stabilizer not set within the green band area of the LONG TRIM indicator

19
Q

What will the spoilers do if the throttles are advanced for a rejected landing

What will happen to the SPD BRK handle for goaround

A

They will retract after deployment if the throttles are advanced for a rejected landing
- The spoilers retract and the SPD BRK lever will be disarmed if the throttles are advanced for a go around

20
Q

What is the progression of the stall protection system

A

AUTO SLATS - if the flap/slat handle is set in the 0 to 13° flap range, airspeed is 240 kn or less, and either of the two stall warning computers detects a stall, the slats extend automatically from the mid to the extended position
STICK SHAKER - as the aircraft continues into a deeper pre stall
STALL WARNING LIGHTS AND AUDIO - as of the aircraft continues into a stall, either stall warning computer will activate the stall warning horn, vocal “STALL”, and illuminate the red glare shield stall lights
STICK PUSHER - when ever a stall condition is detected by both stall warning systems and the slats are not retracted, the control columns or abruptly moved forward, the STICK PUSHER PUSH TO INHIBIT Glareshield lights illuminate, and the auto pilot, will disconnect

21
Q

Where are the four sets of longitudinal trim switch is located and which trim motor do they operate

A
  1. Control wheel trim switches - primary trim
  2. One set of LONG TRIM handles on the pedestal - primary trim and override the electric control wheel switches as well as the ALT LONG TRIM levers
  3. One set of ALT LONG TRIM levers on the pedestal - alternate trim motor
22
Q

What’s the operation of the spoilers/speed brakes on the ground and in-flight

A

Ground - all spoilers, flight and ground, or extended to a maximum of 60° to serve as ground spoilers during landing or rejected take off, either automatically or manually

Flight -

  1. Manually moving the pedestal mounted spoiler/speed brake lever aft extended stay for flight spoilers to serve as speed brakes
  2. The surfaces baby symmetrically extended to a maximum of 35°
  3. Use of aileron Control during speedbrake operation results in a symmetrical extension of the spoilers to aid in the lateral control
  4. Speed brakes may be extended with slats extended in flight
23
Q

What’s the function of the rudder throw limiter
88
Speeds and degrees
Msg

90

A

MD88

  1. installed to protect the empennage from overload in case of inadvertent application of excessive rudder control
  2. During acceleration, the throw limiter is scheduled to vary, between the maximum throw of 22° unrestricted, to 2 1/2° for the restricted, at approximately 300 kn
  3. Blue RUDDER TRAVEL UNRESTRICTED light must be extinguished above 200 kn. On deceleration, the throw increases until reaching 22° at a minimum speed of 165 kn
  4. The rudder throw limiter is monitored by the blue RUDDER TRAVEL UNRESTRICTED light on the OAP

MD90

  1. Primary and backup rudder throw limiter systems protect from inadvertent overload. Failures in either of the primary or back up limiting systems generate messages on the OAP
  2. A rudder hook monitor verifies that the primary limiter is in the proper position.
  3. No blue RUDDER TRAVEL UNRESTRICTED light is installed
  4. The back up rudder throw limiter is hydraulically powered, it protects from overload in the event of excessive rudder control attained due to a failure in the primary system
  5. The ACU monitors the rudder limiter, and commands the hydraulic actuators based on airspeed. Hydraulic power supply to each actuator by its associated hydraulic system. The back up limiter continues to operate with single system hydraulic failure
  6. A back up limiter is retracted by springs in the event both hydraulic systems fail
24
Q

What’s the purpose and function of the pylon flap system on the 90

A
  1. It is installed on the trailing edge of each pylon, provides increased aircraft nose down pitching moment in the event a deep stall is encountered
  2. Moving either control column to the forward stop activates the system. The pylon flap surfaces move from neutral position to fully deployed. Moving the control column off the forward stop causes the pylon flat surfaces to return to the neutral position
  3. the blue ELEVATOR AT LIMIT light on the OAP illuminates to indicate that the pylon flaps and the elevators have reached before down position, and will also illuminate to indicate fall up position of the elevator
25
Q

What is the purpose of the Mach trim compensator

88
90

A

MD88

  1. Operating on a machspeed schedule, the Mach trim compensator pause the first officers control column aft as Mach Number increases to compensate for the normal pItch down, tuck, characteristic encountered at high Mach operations
  2. With the switch in NORM the Mach trim compensator positions the first officers control column aft at speeds greater than .80 Mach
  3. The function is controlled by the MACH TRIM COMP switch located on the overhead panel
  4. With the switch in OVRD, The system is deactivated

MD90

  1. Mach trim compensation is accomplished with horizontal stabilizer trim
  2. The function is controlled by the MACH TRIM COMP switch located on the overhead panel
  3. With the switch in OFF The system is deactivated

MD88/90 Systems (15 decks)

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