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Mesa E-175 Oral Prep 2022 (just updated) > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

What physically actuates the flight control surfaces?

A

Power Control Unit (PCUs)

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2
Q

What are the primary flight controls?

A
  1. Ailerons and MFS for roll
  2. Elevator
  3. Rudder
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3
Q

What are the secondary flight controls?

A
  1. Horizontal Stabilizer
  2. Flaps and Slats
  3. MFS
  4. Ground Spoilers
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4
Q

Does the CA’s pitch trim have priority over the F/O?

A

Yes

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5
Q

Manual pitch trim commands are limited to how many seconds?

A

3 seconds

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6
Q

After pressing and holding the AP/Trim Disc, will releasing the AP/TRIM Disconnect Button reactivate any active trim commands?

A

Yes

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7
Q

When the AP/TRIM Disconnect Button is pressed what channels are deactivated?

A

Will disconnect ALL trim functions so long as you have the AP/DISC button depressed

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8
Q

What does pressing one of the 3 Flight Control mode Panel buttons do?

A

Brings the respective flight control into Direct Mode

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9
Q

What are the 2 flight control modes?

A
  1. Normal Mode
  2. Direct Mode
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10
Q

What are the 3 Flight Control Mode Buttons?

A
  1. Elevators
  2. Rudders
  3. Spoilers
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11
Q

What happens when you pull the elevator disconnect handle?

A

Isolates CA and FO control columns for elevator control

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12
Q

What happens when you pull the aileron disconnect handle?

A

isolates the Captain and First Officer’s control wheel for aileron control

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13
Q

How many ACEs and FCMs are on the 175?

A

9 Actuator Control Electronics
4 Flight Control Modules

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14
Q

How many P-ACEs are there?

A

3 Primary Actuator Control Electronics (2 FWD E-Bay; 1 AFT E-Bay) and control Elevator and Rudders
Each has 2 channels (active and standby)

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15
Q

There are how many SF-ACEs (slat/flap)

A

2 SF ACEs located in the Mid E-Bay (1 for slat; 1 for flaps)

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16
Q

Where is the 1 HS-ACE located?

A

AFT E-Bay

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17
Q

Where are the S-ACEs (spoilers)?

A

They are located within FCM #1, FCM #3, FCM #4 which have wiring to control the S-ACEs

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18
Q

Where is FCMs 1 & 2 located?

A

MAU 1 in the FWD E-Bay

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19
Q

Where is FCM 3 and 4 located?

A

MAU 3 in Mid E-Bay

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20
Q

How are the P-ACEs connected to the FCMs?

A

FCMs are connected to Controller Area Network Bus (CAN BUS) to provide inputs to 3 P-ACEs

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21
Q

What happens to the system logic when you go into Direct Mode?

A

FCMs are removed from the control loop

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22
Q

Which are some of the way the flight controls can go into Direct Mode?

A
  1. Automatic detection of channel failure
  2. Manually selected on Flight Controls Mode Panel
  3. Loss of Airspeed Data
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23
Q

The ____ is the communication link between the FCMs and the P-ACEs

A

Controller Area Network Bus (CAN BUS)

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24
Q

What provides data exchange between all FCMs, and with other components of the avionic system?

A

Avionics Standard Communication Bus (ASCB)

25
Q

Which 2 systems have Power-Up Built in Tests (PBITs)?

A
  1. Electrical
  2. Hydraulic
26
Q

The electrical PBIT is performed when and how long to complete?

A

Anytime during power up after AC power is given to the aircraft and takes 3 mins to complete

27
Q

The hydraulic PBIT takes how long to complete, and requires what to perform test?

A

About 1 min and all 3 HYD systems pressurized with no fluid temp below 50º F or 10ºC

28
Q

How long does the FBW back up battery last?

A

15 mins and is charged by DC ESS Bus 3

29
Q

What are the 3 higher level functions for pitch control?

A
  1. Gain on airspeed
  2. Elevator Thrust Compensation
  3. AoA Limiting
30
Q

What actuator controls pitch trim?

A

HS-ACE communicates to 2 DC electric trim motors (active/stby motors) that drive the HSA, Horizontal Stab. Actuator

31
Q

Pitch Trim Priority?

A
  1. Back-Up Trim
  2. CA trim
  3. FO trim
  4. AP trim
32
Q

Will speed brakes/spoilers work in Direct Mode?

A

No

33
Q

What type of flaps does the 175 use?

A

Double-slotted fowler flaps

34
Q

How many slats per wing?

A

4 total and only outboards (2,3,4) receive wing A/I

35
Q

What is the path from S/F Lever to S/F surface?

A

Slat/Flap Lever > (2) SF-ACE > PDU > Flap Surface

36
Q

What is the path from control wheel to aileron surface?

A

Control wheel > PCU > Aileron surface

37
Q

What is the path from control wheel to elevator?

A

Control wheel > ACE with FCM input > PCU > Elevator surface

38
Q

What is the path from trim to Hzt. Stab.?

A

Trim priority > ACE with FCM input > DC electric trim motor > HSA > HZT Stab

39
Q

What is the path from rudder pedals to rudder surface?

A

Rudder pedals > ACE with FCM inputs > PCU > Rudder surface

40
Q

With RAT deployed, how do the Slats/Flaps operate?

A

Half-speed and only down to Flaps 3 to maintain adequate speed for RAT electrical generation

41
Q

What are the 3 functions of the MFS (3,4,5)?

A
  1. Speed brakes (6 MFSs to 30º)
  2. Roll control
  3. Ground spoilers (MFSs 40º and GSs 60º)
42
Q

When will the spoilers (1-5) auto deploy?

A

Auto deploy
1. WOW
2. Wheel Speed > 45 kts or AS > 60 kts
3. TLA < 26º

43
Q

When do the speed brakes (3,4,5) auto retract in flight?

A
  1. S/F of 2 or greater
  2. Airspeed < 180 kts
  3. TLA > 70º
44
Q

What is the max rudder deflection?

A

30º either direction

45
Q

Which HS-ACE channel is active during an electrical emergency?

A

Channel 2 (DC ESS) at low rate

46
Q

What are the high level functions (FCM) for the rudder?

A
  1. Yaw Damp
  2. Turn Coordination
  3. Gain on airspeed
47
Q

What deploys first and retracts first, slats or flaps?

A

Slats deploy first, flaps retract first (S/F)

48
Q

How many S/F positions are there?

A

7 positions (0 to FULL)

49
Q

What happens to artificial feel if flight controls are disconnected?

A

Artificial feel is felt at 1/2 the normal load

50
Q

How are the flight controls trimmed?

A

Roll and Yaw = Surface repositioned to a new “neutral position”

51
Q

Will the multi-function spoilers function in Direct Mode?

A

Yes, for roll only and at a default fixed gain

52
Q

How do the flight controls operate when the RAT is the only AC Power?

A
  1. HS trim operates at LO SPEED
  2. S/F System operates at LO SPEED
  3. S/F Position is limited to 3
53
Q

Right aileron becomes jammed, what are you left with for roll control?

A
  1. FO aileron control is lost
  2. CA side retains roll control of the left aileron and MFS #5 with normal AFU
54
Q

Left aileron becomes jammed, what are you left with for roll control?

A
  1. CA’s half of the system is jammed.
  2. The First Officer retains control of the right aileron with artificial feel created by a bungee system but roll trim is not available. The pair #4 of multi-function spoilers will remain available.
55
Q

What happens if the rudder pedals are jammed?

A

Rudder control is maintained through the YD and turn coordination (FCM functions)

56
Q

What happens if the rudder PCU (actuator) is jammed?

A

Rudder will be hydraulically locked at the current position. Aircraft control will be established through the ailerons and roll spoilers

57
Q

When will the MFSs auto retract on the ground?

A

Auto retract
1. Wheel speed < 45 kts
2. TLA moved beyond 35º after landing (GA scenario)

58
Q

How do you know if you have a flight control problem like a jammed actuator?

A

The Flight Controls Synoptic Page (flight control will be yellow)

59
Q

Can the Flight Controls be reconnected after pulling red Disconnect Handles?

A

Nope

Mesa E-175 Oral Prep 2022 (just updated) (20 decks)

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