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The U Official 73 > CA Systems Review > Flashcards

CA Systems Review Flashcards

1
Q

What constitutes the N1 section?

A

1) The big FAN in the front of the engine
2) The LOW PRESSURE Compressor that is a “fan” half the size of and just behind the FAN in front of it.
3) Four LOW PRESSURE Turbines that are almost the last things air pass through on the way out of the engine.
* All 3 of these things are on the same “rotor”

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2
Q

What constitutes the N2 section?

A

1) The HIGH PRESSURE Compressor, a multi stage section that has a smaller diameter and resembles an axial flow engine
2) An Accessory Gear Box that is powered off the N2 rotor
3) A single HIGH PRESSURE Turbine that is in front of the four LOW PRESSURE Turbines.

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3
Q

What part of the engine does the bleed air starter initially spin?

A

The N2 rotor

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4
Q

What powers the Accessory Gearbox?

A

The N2 rotor

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5
Q

What is the rated thrust of the CFM56-7

A

27,000 pounds depending on the airframe/engine combination.

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6
Q

At the gate after shutting down the engines, how would you know an exceedance has occurred?

A

A red box will be surrounding a digital readout of the parameter that was exceeded.
EX: A red box around where the EGT digits (not the graphic dial) are normally displayed.

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7
Q

During start up if the EGT digital readout starts flashing, what is happening?

A

The EEC detects an impending HOT START or a COMPRESSOR STALL

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8
Q

On the Engine Vibration readout at the bottom of the lower DU, what does the little tick mark mean?

A

The tick mark represents the high limit of allowed engine vibration.

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9
Q

If the engine exceeds the allowed engine vibration, how will you know?

A

The video on the engine vibration indicator at the bottom of the lower DU will go to inverse video (black digits on a white box).

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10
Q

What are all the altitude associated with the APU?

A

APU Start an Operate … 41,000 feet
APU providing Electrical Power … 41,000 feet
APU providing Bleed Air … 17,000 feet
APU providing Electrical Power AND Bleed Air … 10,000 feet

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11
Q

During an engine start, what happens if there is no EGT rise for 15 seconds after the start lever is moved to IDLE?

A

The EEC recognizes a wet start and shuts off fuel and ignition.

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12
Q

If you are on the ground with the APU running, what happens if you put the Battery Switch to OFF? What about in the air?

A

In both cases the APU will shut off.

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13
Q

Before you turn off the battery switch while at the gate, what do you need to double check?

A

Make sure the APU is off, or putting the Battery Switch to OFF will kill the APU.

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14
Q

What are the leading edge lift devices and where are they located?

A
  • Leading Edge FLAPS are located inboard of the engines (2 on each wing).
  • Leading Edge Slats are located outboard of the engines (4 on each wing).
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15
Q

Where are the ground versus flight spoilers?

A

There are 4 flight spoilers in the middle of the wing. There is 1 additional small ground spoiler just to the outboard of the 4 flight spoilers, and 1 large ground spoiler right next to the fuselage.

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16
Q

When does deflection of the flight spoilers start?

A

Does not start until the control wheel is displaced more than about 10 degrees.

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17
Q

Do the elevators use hydraulics to move?
What about the stabilizer?

A
  • Yes
  • No. The stab moves electrically
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18
Q

Can you use the elevators without hydraulics?

A

Yes. There are flight control switches above the captain’s head that allow you to isolate all primary flight controls, including the elevators, from the associated hydraulic system.

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19
Q

What does an RF displayed next to the HYDRAULIC QTY% mean?

A

The quantity is below 76% and needs a refill.

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20
Q

What is the “normal system pressure” for the hydraulic system with pumps operating?

A

3000 to a maximum of 3500 psi

21
Q

With the loss of Hydraulic System B, the checklist calls for a Flaps 15 landing using the alternate flap extension. What concern should you have in the back of your mind?

A

Once extended, the leading edge devices cannot be retracted and planning is required as the drag penalty may make it impossible to reach and alternate airport.

22
Q

If you put the ENG 2 hydraulic pump to OFF, what does it do to the pump?

A

Nothing, the pump keeps spinning because the engine is still spinning. HOWEVER, positioning the switch to OFF will isolate flow to system components.

23
Q

If you put the ELEC 2 hydraulic pump to OFF, what does it do to the pump?

A

The OFF position removes electrical power to the pump.

24
Q

Why are the ENG HYD PUMP switches normally left ON?

A

To prolong solenoid life.

25
Q

What does the V-B-R knob in the bottom center of the comm panel do?

A

Only affects the audio from a navigation source.
V (voice) left position - receive NAV voice audio
B (both) middle position - receive NAV voice and range audio
R (range) right position - Receive NAV station identifier audio

26
Q

Where are the VHF and HF radio antennas located?

A

VHF 1: upper fuselage
VHF 2 & 3: lower fuselage
HF: vertical stab

27
Q

What does the small black switch just under the ACTIVE window on the radio panel do?

A

It is the OFF switch. If the switch is black, and you hit it, the button illuminates with white OFF lettering and the comm panel is turned off. Check this when troubleshooting.

28
Q

What does the knob marked HF SENS in the lower left part of the comm pannel do?

A

The HF Sensitivity Control is rotated to change the sensitivity of the on-side HF receiver.

29
Q

There is a tiny white pin light near the top center of the comm panel. If it is illuminated, what does it indicate?

A

That the radio normally associated with this panel is being turned by another RTP.

30
Q

On the comm panel, pushing the VHF “TEST” button does what?

A

Removes the radio’s automatic squelch feature, which then receives background noise and indicates the receiver is operating. It may also be used for the reception of weak signals.

31
Q

On the comm panel, AM button does what?

A

Toggles between AM (amplitude modulation) and USB (upper side band) modes. The light is illuminated when AM is selected.

32
Q

What are the elaborate doors near the wing root that you often see during preflight. What are they for?

A
  • Ram Air Inlet doors
  • For maximum colling on the ground, or during slow flight with the flaps not fully retracted, the door move to the full open position. A blue “RAM DOOR FULL OPEN” light will illuminate at the top of the air panel.
33
Q

With the APU BLEED ON and both engine BLEED switches to OFF, what happens with the packs?

A

The packs automatically switch to high flow, regardless of the number of operating packs, the air/ground status or flap position.

34
Q

If the aircraft is parked at the gate with no ground power, no APU power and a ground crewman says that there is a fire, can you detect it? Can you fight it? What about a Cargo Fire?

A

The hot battery bus supplies power to the engine and APU fire extinguishers. However the detectors are not powered. SO, you could discharge the extinguishers, but a ground person would have to signal you that there’s a fire (unlikely to be an engine or APU fire cold at the gate). The cargo fire extinguishers are just like above, but it is more “possible” that a bag could catch fire with the aircraft cold.

35
Q

On the fire panel, the OVHT DET switch on the far left of the panel is in the normal (middle) position, and the amber FAULT light is on. What does this mean?

A

Both detector loops for an engine have failed.

36
Q

On the fire panel, the OVHT DET switch on the far left of the panel is in the “A” (left) position, and the amber FAULT light is on. What does this mean?

A

The “A” detector loop for an engine has failed.

37
Q

If an engine overheat occurs, what indication do you get?

A
  • Master Caution lights (x2)
  • Amber OVHT/DET on the left eyebrow panel (CA side)
  • Amber ENG 1 OVERHEAT (or ENG 2) on the pedestal fire panel
38
Q

If an engine fire occurs, what indication do you get?

A
  • All the same indications you get with an Overheat, plus…
  • Bell sounds
  • Master FIRE WARN lights (x2)
  • The appropriate extinguisher pull handle illuminates
39
Q

If an APU fire occurs, what indication do you get?

A
  • Bell sounds
  • Master FIRE WARN lights (x2)
  • The APU extinguisher pull handle illuminates
  • !!! and the APU automatically shuts down !!!
40
Q

1) Where does the APU draw fuel from?

A

1) The left side of the fuel manifold when the pumps are running, or the No. 1 (left) Tank via suction feed when they are not.

41
Q

What does the fuel pressure have to do with the Center vice Wing tanks?

A

The pumps of the Center Tank supply fuel at a slightly higher pressure than the wing tank pumps, so the fuel is therefore consumed first from the Center Tank.

42
Q

What is the Boeing light logic with regards to the SPAR VALVE CLOSED light?

A

Dim blue = valve is closed
Extinguished = valve is open
Bright blue = valve in transit or in disagreement with commanded position.

43
Q

What is the Boeing light logic with regards to the crossfeed VALVE OPEN light?

A

Dim blue = valve is open
Extinguished = valve is close
Bright blue = valve in transit or in disagreement with commanded position.

44
Q

If both fuel LOW PRESSURE lights on the same side illuminate in flight, what should your concern be?

A

thrust deterioration or engine flameout may occur!!!

45
Q

Can you control the elevators after a dual hydraulic failure?

A

Yes. The force required to move the elevators will be higher due to system friction and aerodynamic loads.

46
Q

When does the aircraft use high speed versus low speed trim?

A

With the flaps extended, both manual and autopilot electric trim is in high speed mode and revert to low speed when the flaps are up.

47
Q

When is STS (Speed Trim System) operating?

A

Operates most frequently during takeoff, climb and go-around under the following conditions (must meet all requirements):
* Full STS from 100 kts to .6 M with a fadeout at .68 M
* 10 seconds after takeoff
* 5 seconds after the release of trim switches
* Autopilot not engaged
* Sensing of a trim requirement

48
Q

Is the rudder hydraulically powered?

A

Yes.

49
Q

The tail of the 737 has a big A-hole on the back in, with a slightly smaller A-hole just above it. What are these?

A

The lower, larger one is the APU exhaust.
The smaller, higher one is the APU cooling inlet.

The U Official 73 (19 decks)

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