Air Conditioning / Pressurization

Question 1

Bleed Air uses:

Answer 1

• Engine Starting
• Engine / Wing Anti-Ice
• Air Conditioning / Pressurization
• Water Tank Pressurization
• Hydraulic Resivior Pressurization

Question 2

Low / High Stages of Bleed Air

Answer 2

Low - 5th

High - 9th

Question 3

How are the Engine Bleed Air Valves controlled and operated?

Answer 3

Controlled: DC Electric
Operated: Pneumatic

Question 4

BLEED TRIP OFF

Answer 4

• Engine bleed temperature or pressure exceeds limits.
• Valve automatically closes
• Reset by TRIP RESET

Question 5

How is the Isolation Valve operated?

Answer 5

AC Electric

Question 6

What causes the Isolation Valve to automatically open with the switch in AUTO?

Answer 6

Any Pack or Engine Bleed OFF

Disregards APU and EXT air

Question 7

APU Bleed can supply _____ pack(s)

Answer 7

On the ground - 2

In air - 1

Question 8

Operate the APU for a minimum of _____ prior to using it as a bleed source.

Answer 8

1 minute

Question 9

DUAL BLEED

Answer 9

Reminder of the possibility of back pressure to APU.
(APU + ENG 1 BLEED - or - APU + ENG 2 BLEED + ISO)
* Switch position only
* Do not operate engine thrust above IDLE

Question 10

Trip Reset Switch can reset:

Answer 10

Pack Trip Off, Bleed Trip Off, Duct Overheat

Question 11

WING BODY OVERHEAT

Answer 11

Bleed Leak from:
Left Engine
Left Inboard Wing Leading Edge
Left Air Conditioning Bay
Keel Beam to APU
Right Engine
Right Inboard Wing Leading Edge
Right Air Conditioning Bay

Question 12

1 Pack can supply pressurization up to:

Answer 12

FL410

Question 13

Do not operate both packs from:

Answer 13

1 Engine Bleed at any time

Question 14

With Engine Bleed ON, do not operate the packs in HIGH for:

Answer 14

Takeoff, Approach, Landing

Question 15

With Packs in AUTO, what is the logic?

Answer 15

1 Pack - High Flow (In flight, Flaps Up)
2 Packs - Low Flow
APU only source - High Flow

Question 16

PACK TRIP OFF

Answer 16

Pack has exceeded temperature limits
Pack Valve closes, Mix Valve to full cold.
Trip Reset after condition corrected

Question 17

Recirc Fan - Auto

Answer 17

On except with 1 (or more) pack selected HIGH (2 packs operating)

Question 18

DUCT OVERHEAT

Answer 18

Distribution Cabin Ducts exceed temp limit
Air mix valves drive to full cold
Requires reset

Question 19

What are the components for cooling the E & E compartment?

Answer 19

2 Supply Fans (Norm / Altn)
2 Exhaust Fans (Norm / Altn)
Overboard Exhaust Valve

Question 20

Ram Air Doors are open:

Purpose:

Answer 20

On the ground
In flight with slow airspeed
-Provides cooling air for the heat exchangers

Question 21

What are the pressure relief valves on the airplane?

Answer 21

2 - Positive Pressure Relief Valves (max of 9.1)

1 - Negative Relief Valve

Question 22

What controllers do we have for the outflow valve?

Answer 22

Auto - Motor 1
Altn - Motor 2 (Alternates per flight)
Man - Manual Motor (Pilot Controlled) (Battery Bus)

All DC Motors driving a single Outflow Valve

Question 23

What causes the Overboard Exhaust Valve to open?

Answer 23

On Ground and In Flight with low differential - OPEN
In Flight - Closed (Air routed to FWD cargo)

Will be commanded open in flight with:
- Any Pack HIGH  -and-
- Recirc Fan OFF (Right Recirc in -800)
Also when:
- FWD Cargo Fire Alarm

Question 24

Cabin Altitude Warning at:

Answer 24

10,000 feet

Question 25

ALTN
ALTN + AUTO FAIL
AUTO FAIL

Answer 25

• The other Cabin Pressure Controller is operating
• Single controller failure and automatically switched to Alternate controller.
• Both cabin pressure controllers failed

Question 26

OFF SCHED DESCENT

Answer 26

Abort Mode

Did not reach within .25 psi of cruising altitude

Question 27

Max Cabin Altitude

Answer 27

8,000