Air Systems

Question 1

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

Answer 1

yes

Question 2

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 2

Closed

Question 3

BLEED TRIP OFF Light

Answer 3

illuminated: excessive engine bleed air temperature or pressure

• related engine bleed air valve closes automatically
• requires reset

how to reset = trip reset switch

Question 4

What systems rely on Bleed Air?

Answer 4

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

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

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

Answer 6

DC / pressure

Question 7

WING-BODY OVERHEAT light (Left or right)

Answer 7

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 8

PACK (light)

Answer 8

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 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

ISOLATION VALVE (switch)

Answer 11

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 12

DUAL BLEED (light)

Answer 12

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 13

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

Answer 13

YUP