Air Systems

Question 1

DUAL BLEED (light)

Answer 1

Illuminated:
APU bleed air valve open and engine NO.1 BLEED air switch ON or engine NO.2 BLEED air switch ON

APU bleed air valve and isolation valve open

Question 2

ISOLATION VALVE (switch)

Answer 2

Close = closes isolation valve

AUTO:
- closes isolation valve is both BLEED air switches are ON and both air conditioning PACK switches are AUTO or high

• opens isolation valve automatically if either engine BLEED air or air conditioning PACK switch positioned OFF

Open = opens isolation valve

Question 3

WING-BODY OVERHEAT light (Left or right)

Answer 3

illuminated:

LEFT light indicates overheat from bleed air duct leak in left engine strut, left inboard wing leading edge, left air conditioning bay, keel beam or APU bleed air duct

RIGHT light indicates overheat from bleed air duct leak in right engine strut, right inboard wind leading edge or right air conditioning bay

Question 4

BLEED TRIP OFF Light

Answer 4

illuminated: excessive engine bleed air temperature or pressure

• related engine bleed air valve closes automatically
• requires reset

how to reset = trip reset switch

Question 5

PACK (switch)

Answer 5

OFF = pack signaled off

Auto:
- with both packs operating, each pack regulates : Low Flow

• with one pack operating, operating pack regulates to high flow in flight with flaps up
• when operating one pack from APU (both engine BLEED air switches OFF) regulates to high flow

HIGH:
pack regulates to high flow
provides maximum flow rate on ground with APU BLEED air switch ON

Question 6

PACK (light)

Answer 6

Illuminated:

• 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. extinguishes when master caution is reset

Question 7

What systems rely on Bleed Air?

Answer 7

Air conditioning / pressurization
wing and engine thermal anti-icing
engine starting
HYD reservoirs pressurization
Water tank pressurization
Aspirated TAT probe

Question 8

With the engine bleed air switch ON, the valve is (BLANK) activated and (black) operated?

Answer 8

DC / pressure

Question 9

The Duct pressure indicator is powered by what electrical?

Answer 9

AC

Question 10

The isolation valve is powered by what electrical ?

Answer 10

AC

Question 11

Does the isolation valve open if either bleed air switch or air con pack is switched to off?

Answer 11

yes

Question 12

With the isolation valve switch in AUTO, both bleed air switches ON, and both air conditioning pack switches AUTO or HIGH is the isolation valve open or closed?

Answer 12

Closed

Question 13

Is a single pack capable of maintaining max pressurization and acceptable temperatures up to max certified ceiling?

Answer 13

YUP

Question 14

Outflow valve full range of motion takes

Answer 14

20 seconds

Question 15

OFF SCHED DESCENT

What is it?
What will it do?

Answer 15

Airplane begins to descend without having reached the preset cruise altitude.

Cabin controller will program to land at the takeoff airport.

• RECRUISE

Question 16

Flight Altitude Indicator

If there’s a disruption in DC or a failure what happens?

Answer 16

Failure detected after a DC power interruption will result in 88888 display or all dashes.