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737 NG > 737 Air Systems > Flashcards

737 Air Systems Flashcards

1
Q

What is the meaning of the BLEED TRIP OFF light?

A

Excessive bleed air or temperature so that related engine bleed air valve has closed automatically.
* requires reset

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2
Q

Temperature Sensors
* AUTO?
* OFF?

A

AUTO - automatic temp control for the associated zones. Full rotation is between 65* and 85º
OFF - closes the associated Trim Air modulating valve

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3
Q

What does the ISOLATION VALVE switch do?

A

Isolates the two sides of the Bleed Air system
CLOSE - closes the valve
AUTO - closes automatically if both engine bleed air switches are on and both air conditioning PACK switches are AUTO or HIGH
OPEN - Opens isolation valve

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4
Q

Explain function of TRIP RESET switch

A

Push (if fault condition is corrected)
* resets BLEED TRIP OFF, PACK and ZONE TEMP Lights
* related engine bleed valve opens, or related pack valve opens, or related air mix valve opens
* light remains illuminated until reset

The trip switch does NOT reset a WING-BODY OVERHEAT light

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5
Q

What is the alert for an E&E bay overtemp on the ground?

A

Crew call horn in the nose wheel well

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6
Q

Explain the three functions of the Pressurization mode selector?
1. AUTO
2. ALTN
3. MAN

A
  1. AUTO - system controlled automatically
  2. ALTN - pressurization system controlled automatically using ALTN controller
  3. MAN - system controlled manually by outflow valve switch and both auto controller bypassed
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7
Q

What causes the altitude warning Horn to sound?

A

Cabin Altitude above 10,000 ft.

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8
Q

Explain the function of the cabin ALT HORN CUTOUT switch

A

Pushing it cuts out intermittent cabin warning horn.

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9
Q

What causes the WING-BODY OVERHEAT light to illuminate?

A

Left light means overheat in bleed air duct at:
- left engine strut
- left inboard wing leading edge
- left air-conditioning bay
- keel beem
- APU bleed air duct

Right light:
- RH engine strut
- RH inboard wing leading edge
- RH air-conditioning bay

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10
Q

Explain the function of the Air Temperature Source selector

A

Shows temp in various areas of plane.

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11
Q

What is the meaning of an illuminated PACK light?

A

Indicates pack trip off or failure of both primary and standby pack controls.

During MASTER CAUTION recall, indicates failure of either primary or standby pack control.

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12
Q

Explain meaning of ZONE TEMP light in:
- CONT CAB (control cabin)
- FWD or AFT CAB

A

CONT CAB - indicates duct overheat or failure of the flight deck primary and standby temp control.

FWD or AFT CAB - indicates duct overheat

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13
Q

What is the meaning of an illuminated OFF SCHED DESCEND light?

A

The airplane descended before reaching the planned cruise altitude set in the FLT ALT indicator.

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14
Q

What is the TRIM AIR switch used for?

A

Turns on and off the trim air system valve.

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15
Q

What does the RECIRC FAN do?

A

It reduces the AC pack load and bleed air demand.

Draws air from the pass cabin and electrical equipment bay (E&E) to the forward cargo bay where it is filtered and re-circulated to the mix manifold.

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16
Q

Explain function of EQUIP COOLING EXHAUST switch?
- NORM
- ALT

What happens if the OFF light is illuminated on the switch panel?

A

NORM - normal cooling exhaust fan activated
ALT - alternate cooling fan exhaust fan activated

Fan is no longer working and need to switch to alternate fan. Once switched the light should go off within 5 seconds.

17
Q

What is the meaning of a DUAL BLEED light on the air systems panel?

A

The APU bleed air is open and there is back pressure in the ducts.
Configuration Left engine
- APU bleed valve open and engine NO. 1 BLEED air switch on or,

APU bleed valve open and engine NO. 2 BLEED switch on and isolation valve is open

18
Q

What do the blue RAM DOOR FULL OPEN lights mean?

A

Ram air cooling doors are open position which happen only on the ground or in the air when the flaps are extended.

19
Q

Describe function of BLEED air switches.

A

ON - opens the bleed air valve when engines are running. This valve can only open when there is bleed air pressure.

20
Q

Describe function of APU BLEED air switch?

A

ON - opens the APU BLEED valve only when the APU is operating.

21
Q

What are the three functions of the PACK switch?

A

OFF - pack off
AUTO - pack in automatic mode
HIGH - pack regulates to high flow which will provide max o rate on the ground with the APU BLEED switch ON

22
Q

What four ways can air be provided to the aircraft interior?

A
  1. RH bleed air from engine
  2. LH bleed air from engine
  3. APU bleed air
  4. On the ground pressure air can be supplied through a high pressure air source connected to a duct on the bottom of the aircraft.
23
Q

To which side of the system (LH or RH) does APU bleed air provide pressure?

How about the high pressure ground air source?

A

LH side - APU

RH side - ground air source.

24
Q

APU bleed air provides enough air flow for _________ packs on the ground and ___________ packs in the air.

A

2 packs on the ground and 1 pack in the air.

25
Q

APU bleed air can be used up to an altitude of ___________ ft.

A

17,000 ft

26
Q

When will the blue APU GEN OFF BUS light illuminate?

A

Once the APU is started but the APU generator has not yet been connected.

27
Q

When is it normal for the amber DUAL BLEED light to be on?

A

At engine start. (according to the CBT video)

28
Q

When the aircraft is on the ground is it possible to get air-conditioned air into the cabin without using any of the bleed air sources or high pressure ground air source?

A

Yes, air-conditioned air can be fed directly into the mix manifold, so one could say there are 5 ways to get air into the cabin on the ground.

29
Q

What will happen if only one pack is operational?

A

The operating Pack will automatically switch to high flow mode.

30
Q

What valves do the Temperature Selectors directly affect?

A

The trim air modulating valves.

737 NG (21 decks)

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