Air System

Question 1

Trim Air is from what systems?

Answer 1

1 & 3 to a Common Trim Air Manifold

Question 2

If you turn off both packs 1 & 3 is trim air available?

Answer 2

No

Question 3

The trim air manifold runs through which compartment?

Answer 3

The avionics bay

Question 4

External air can be hooked up into which systems and which side of the airplane?

Answer 4

System 1 & 2 on the left side

Question 5

Will external air operate the packs?

Answer 5

Yes, packs 1 & 2

Question 6

Conditioned air hooks into which side of the airplane? Will it operate the packs?

Answer 6

The right side. No it bypasses the packs and goes directly to the common conditioned air distribution manifold.

Question 7

When does avionics cooling start?

Answer 7

With AC power application

Question 8

How many cooling fans are in the avionics bay? How about the CAC? How many run at a time?

Answer 8

3 cooling fans in both. Only one runs at a time, the others are backups.

Question 9

On TO, how is the avionics exhaust fan and venturi configured? When will they change?

Answer 9

Avionics exhaust fan is ON, Venturi (shut-off valve) closed.
It opens after TO at 1.5psid and the fan turns off

Question 10

Flow light in the Avionics Fan switch means what?

Answer 10

1) Insufficient air for cooling (avionics or CAC)
2) Cabin inflow is insufficient for pressurization
3) Cabin altitude >10,000ft

Question 11

Avionics Fan switch override light means?

Answer 11

Exhaust Fan On and

Venturi valve Closed

Question 12

How is the Air System Test started? What does it Test?

Answer 12

Annunciator Light Test Button
Tests: TEMAC
Trim Air Shut-Off (2 PRV’s)
Engine 2 Anti-Ice Duct
Manifold Failure Detection System
Avionics Fans
CAC Fans

Question 13

Cabin Altitude Light means what? What happens?

Answer 13

Cabin pressure altitude >10,000 ft in AUTO or MAN takes ECON OFF (Packs to high flow)

Question 14

Trim Air Switch Avionics Overheat means what?

Answer 14

Leak in the trim air manifold, both trim PRV’s will close.

Question 15

Cabin Air Smoke light, will the Cargo Zone Cond. Air S/O valve close? What’s the difference between Auto and manual?

Answer 15

Only after you push the button. In auto it’ll reduce to single pack. In manual you have to do that first then select the Cab Air Smoke switch off

Question 16

Pack 1 Flow light means?

Answer 16

Pack is commanded on with airflow is insufficient or pack is commanded off with flow present

Question 17

What is the limitation for active engine pneumatic supplies?

Answer 17

Do not interconnect 2 or more active engine systems

Question 18

Temp HI light means what? Does it automatically close the PRV?

Answer 18

Hot air downstream of the pre-cooler.
In auto it closes the valve. (Level 1)
In manual you have to close it. (Level 3)

Question 19

MANF Light closes the PRV’s in both auto and manual?

Answer 19

True. But in manual you have to perform a decay check IAW QRH

Question 20

#1 Manifold Alert means?
#1 & 2 means?

Answer 20

Leak between #1 engine and the fuselage.

Leak at the forward left tunnel

Question 21

2 Manifold Alert means?

Answer 21

Leak aft of the CAC

Question 22

#3 Manifold Alert means?
#1 2 and 3 means?

Answer 22

#3 means engine to fuselage and/or right forward tunnel
All three means leak within the CAC

Question 23

Does the red manifold light extinguish?

Answer 23

Once it cools down.

Question 24

The manifold failure detection system protects:

Answer 24

3 MANF’s
3 Packs
CAC
Tail Pylon Area
Horizontal Stab A/I

Question 25

DITCH Switch does what?

Answer 25

Depressurizes
Inhibits EGPWS
TCAS to TA
Closes
Holes

Question 26

When are the 6 windows de-fogged?

Answer 26

From preflight to shutdown

Question 27

When do you use Wing A/I on the ground?

Answer 27

<=6 degrees and taking off into icing conditions

Question 28

Run up requirements at takeoff and taxi?

Answer 28

1) Hold brakes, N1 to 60% check engine indications.

2) Every 15 minutes for 30 sec run N1 to 60%. (if unable, run-up on RWY for 30 sec)

Question 29

How many sources can one bleed support?

Answer 29

4 except up to 5 on one (one pack and wing/tail A/I when departing icing conditions