Air Systems

Question 1

what are the 3 sources of high pressure air

Answer 1

Engine bleed Air, Apu bleed, external air

Question 2

Pnuematic system supplies

Answer 2

Air conditioning/pressurization, engine starting, wing and engine anti-ice, hydraulic reservoir head pressure

Question 3

Isol valve is only a manual valve?

Answer 3

True (Open and Close)

Question 4

Describe the “bleed air malfunction” HI STAGE light illumination

Answer 4

At low idle settings, low bleed air may not be enough and can kick to h bleed automatically (no indication of this). If high bleed over pressures the system HI STAGE illuminates and auto locks hi stage bleed valve closed

Question 5

L or R Eng Bleed Air amber message means

Answer 5

Automatically due to system fault, the switch is off, the engine is not running.

Question 6

Can APU bleed air be ran for anti-ice operation

Answer 6

NO

Question 7

Can you use one air start cart for engine starting?

Answer 7

Yes, but only if it has two connections or hoses. Also can use two carts, both having one hose.

Question 8

Leak detection loops protect which areas

Answer 8

APU, L/R and Crossover

Question 9

What indications of a duct overheat

Answer 9

Caution Beeper, BLD Duct Leak on eicas, DUCT leak on overhead

Question 10

767 - how many ducts?

Answer 10

L isol, R isol, C isol, not automatic

Question 11

How many controllers for pressurization?

Answer 11

2 auto controllers.

Question 12

What indications that both controllers have failed

Answer 12

Auto INOP light illuminates

Question 13

When does cabin altitude light illuminate and extinguish?

Answer 13

C A exceeds 10,000 ft and when it returns below 8,500 ft.

Question 14

What 4 pieces of date do controllers use?

Answer 14

ADS for ambient pressure, selected cabin auto rate, takeoff alt, selected landing alt

Question 15

What does the auto rate set at index for preflight indicate?

Answer 15

500fpm climb and 300 fpm descent

Question 16

How is the outflow valve controlled?

Answer 16

auto = AC and Manual = DC

Question 17

Location on Positive and Neg Relief valves on 757/767

Answer 17

757 - positive relief valve is aft left and neg relieve is fwd right
767 - two negative relief valves on each cargo door and one forward of positive relief valve.

Question 18

What makes up the air conditioning system?

Answer 18

Two packs, two controllers, mix manifold and Recirc fan

Question 19

How many compartments?

Answer 19

3 Deck, FWD and AFT

Question 20

PACK INOP light indicates?

Answer 20

Pack outlet overheat or fault in the automatic controller system

Question 21

Pack in auto position means

Answer 21

Pack flow valve is open

Question 22

Any indications of flow management for engine failure in flight deck?

Answer 22

No, all flow management is automatic with no indications

Question 23

Why is the L recirc fan guarded?

Answer 23

essential part of the equipment cooling system, remains on.

Question 24

Recirc fan inop light if…

Answer 24

Fan fails, switched off, not operating

Question 25

FWD Cargo Fire armed does what?

Answer 25

Turns both recirc fans off

Question 26

AFT Cargo Fire armed turns both recirc fans off?

Answer 26

No, just the R recirc fan.

Question 27

Does fuel consumption increase with recirc fans off?

Answer 27

Yes, slight increase in fuel consumption with each fan that is off

Question 28

What is Trim air?

Answer 28

Warm air mixed into compartments, used to differentiate between compartments. If no trim air the compartments will all maintain constant temps. Trim air is controlled with auto compartment air selector.

Question 29

Shoulder and Foot heaters work on the ground and in flight?

Answer 29

No, just in flight.

Question 30

Equipment OVHT light illuminates if...

Answer 30

Either supply fan fails or inop, overboard exhaust valve is closed with the L recirc fan failed or switched off

Question 31

Can you select another supply fan?

Answer 31

Yes ALTN can be selected manually, with some a/c this is automatic and will not receive an OVHT light

Question 32

FWD EQPT SMOKE light illuminates if smoke in the system and turns off when...

Answer 32

Both recirc fans are turned off and the slats are in the up position, PACKS to high flow when recirc fans are off, overboard exhaust valve opens

Question 33

Does the AFT equipment cooling have smoke detection?

Answer 33

NO

Question 34

-300 have how many compartment controllers

Answer 34

4, 2 backup fans for equip, if on 3rd one (Aux fan) non essential avionics and electrical equipment are subject to failure. Aux fan driven by the hydraulic driven gen.

Question 35

767 - equipment cooling is controlled how?

Answer 35

Automatically based on air temp, air/ground mode and engine operation

Question 36

767 - what does the OVRD position indicate

Answer 36

reverses airlflow and dumps it overboard. Illumintes no cooling light

Question 37

767 - OVHT light illuminates for cargo, what does that mean?

Answer 37

Valve closes because temp is high, when it returns to normal around 45 F it will open and the message will disappear

Question 38

767-Bulk Cargo Heat selector position should be ?

Answer 38

Vent - turns the vent fan on and keeps it at higher than normal temperature

Question 39

Which a/c has gasper fan?

Answer 39

767-300

Question 40

Why is the C ISOL guarded on 767?

Answer 40

to prevent damage to air pump.