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Sierra West Airlines > PTM Ch. 15 Flight Controls > Flashcards

PTM Ch. 15 Flight Controls Flashcards

1
Q

What are the primary flight controls?

A

Ailerons, rudder, and elevators

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2
Q

How are control inputs transmitted to the flight control surfaces?

A

Through cables, push-pull rods, and bellcrank-actuated trim tabs

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3
Q

What is attached to the forward side of the control column to apply a nose down preload on the pitch control system?

A

Bob weight

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4
Q

How does the control lock work?

A

Lock pins are mechanically inserted into the actuating linkage of the rudder and ailerons, and both power levers are restricted to the aft of FLT IDLE.

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5
Q

The control lock system is…?

A

Fail-safe

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6
Q

What does it mean when the control lock system is fail-safe?

A

Lock pins are spring-loaded to disengage if the control lock cable breaks.

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7
Q

Why can’t the control lock be engaged in flight with the power levers forward of ground idle?

A

Mechanical blockage of by the power lever linkage.

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8
Q

How can the elevator be secured on the ground?

A

Using a seat belt extension to hold the control column fully aft.

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9
Q

The trim tabs also function as…?

A

Servo tabs

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10
Q

Are there trim tabs on the elevators?

A

No

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11
Q

How is pitch trim accomplished?

A

By moving the horizontal stabilizer

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12
Q

How is the horizontal stabilizer moved?

A

An actuator containing two DC motors and two screwjack mechanisms

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13
Q

Where is the pivot point for the horizontal stabilizer?

A

Near the stabilizer rear spar.

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14
Q

The motor on the pilot’s side is controlled by what?

A

Left essential bus

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15
Q

The power to the trim motor on the copilot’s side (controlled with the copilot’s trim switch and AUX switch) is powered by what?

A

Right essential bus

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16
Q

The out-of-trim warning shouldn’t work in the air because of what?

A

A squat switch

17
Q

What kind of flaps does the Metro have?

A

Double slotted Fowler flaps

18
Q

How do the flaps work?

A

Electrically controlled and hydraulically actuated.

19
Q

What prevents asymmetrical operation of flaps?

A

Mechanical interconnection between left and right flaps.

20
Q

What supplies power for flap control and indication?

A

Non essential bus

21
Q

In case of an electrical or hydraulic failure where will the flaps remain?

A

In their last position.

22
Q

What should you do if the flaps don’t operate properly?

A

Move the flap lever to the full UP position.

23
Q

What does moving the flap lever to the UP position do?

A

The circuit is direct, bypassing the circuit and permitting retraction in the event logic circuits fail.

24
Q

What does the input to the two SAS computers come from?

A

Flap position

Power levers position

G-loading

AOA

25
Q

How is AOA measured?

A

By SAS vane(s)

26
Q

What arms the SAS at lift-off?

A

Squat switch

27
Q

When does the stick pusher activate?

A

About 1 knot above stall speed

28
Q

How much force is applied by stick pusher?

A

65 lb

29
Q

Protection from stalls at higher than normal entry rates is provided by what?

A

“Advancement” circuit that ensures all warning devices operate at lower than normal angles of attack.

30
Q

What activates the “advancement” circuit?

A

Forward movement of either power lever beyond 1/2 travel.

31
Q

When will the amber SAS SERVO FAIL annunciator illuminate?

A

Power to stick pusher is interrupted

SAS Servo switch off

Negative G-loads

Failure of servo itself

32
Q

When would a L or R amber SAS FAIL annunciator illuminate?

A

If the respective computer loses power or if the SAS vane is moved full up when on the ground.

33
Q

Is the SAS required for all flights?

A

Yes

34
Q

When must the pitot heat/SAS heat be selected ON?

A

Icing conditions (visible moisture below 5 dC)

35
Q

The flaps are held in any position by what?

A

A liquid lock created by the selector valve and the flap lock valves

Sierra West Airlines (16 decks)

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