Pneumatics

Question 1

Three circumstances in which PCV will close automatically

Answer 1

1) Engine start
2) Engine fire
3) Ditching

Question 2

How can you manually switch from one pressurization controller to the other?

Answer 2

Switch to MAN mode for >10 sec and then back to AUTO

Question 3

2 pressurization safety valves will open at _____ psi

Answer 3

8.6 psi

Question 4

Ditching pushbutton will close which valves (4)

Answer 4

1) Outflow valve
2) Avionics ventilation inlet/extract valves
3) RAM air inlet
4) Pack flow control valves

Question 5

What is the hazard with selecting DITCHING pushbutton on ground?

Answer 5

Could cause pressure differential if air cart connected and all doors closed

Question 6

Engine bleed FAULT light can be reset except for ______ condition

Answer 6

Overheat

Question 7

Which have a single bleed detection loop?
Engine pylons
APU bleed duct
Wings

Answer 7

Engine pylons

APU bleed duct

Question 8

Engine bleed leak will close which two valves?

Answer 8

Engine bleed

Crossbleed

Question 9

How is a wing bleed leak displayed?

Answer 9

Eng bleed FAULT

Question 10

In the case of a wing bleed leak, which valves close? (3)

Answer 10

Respective

1) Engine bleed
2) Crossbleed
3) APU bleed (if left wing leak)

Question 11

What is the maximum descent rate we should see from the pressurization controller?

Answer 11

750 fpm

Question 12

What conditions trigger ABORT with pressurization controller?
Climbing to <8000 ft OR

Answer 12

Climb to <5075 ft
AND
Rate of descent >200 fpm for >30 sec

Question 13

With XBLEED in AUTO and APU on, what happens to these valves:
Crossbleed
APU bleed
Engine bleeds

Answer 13

Crossbleed => OPEN
APU bleed => OPEN
Engine bleeds => CLOSE

Question 14

With PACK FLOW selector in NORM, when will you get HI FLOW? (2)

Answer 14

APU feeding packs

Single pack operation

Question 15

What will cause both BLOWER and EXTRACT pushbuttons to show FAULT? (2)

Answer 15

Smoke warning

Computer failure

Question 16

FAULT indication in BLOWER pushbutton indicates? (2)

Answer 16

Blower pressure is low

Blower duct overheat

Question 17

EXTRACT pushbutton FAULT indicates what condition?

Answer 17

Extract pressure is low

Question 18

Either BLOWER or EXTRACT selected to OVRD does what?

Answer 18

Introduces air conditioned air into avionics ventilation system

Question 19

What three things occur in the avionics ventilation with SMOKE CONFIGURATION?

Answer 19

1) Blower fan stops (Extract fan runs)
2) A/C air added
3) Vent air exhausted overboard

Question 20

T/F. To manually set landing field elevation, cabin pressurization controller must be set to MAN.

Answer 20

False

Question 21

Pack 1/2 FAULT (3)

Answer 21

1) Compressor overheat
2) Pack outlet overheat
3) PCV valve disagreement

Question 22

Hot Air FAULT (1)

Answer 22

Duct overheat

Question 23

Eng 1/2 bleed FAULT (4)

Answer 23

1) Overpressure
2) Overheat
3) Wing/pylon bleed leak
4) Not closed during start

Question 24

APU bleed FAULT (1)

Answer 24

Bleed leak detected

Question 25

FAULT indicated in Cabin Press MODE SEL pushbutton

Answer 25

Both Cabin pressurization controllers have failed