Air

Question 1

What does the BLEED TRIP OFF (amber) light indicate?

Answer 1

Bleed trip sensors have automatically closed the engine bleed air valve, due to:

Excessively high engine bleed air temp (254C), or

Excessively high pressures (220 PSI)

Question 2

Conditions permitting, the TRIP RESET switch resets which lights?

Answer 2

BLEED TRIP OFF

ZONE TEMP

PACK

Question 3

How does the ISOLATION VALVE operate with its switch in AUTO?

Answer 3

Four corners in normal position –> closed

Otherwise –> open

Question 4

What precautions apply with the APU bleed valve when an engine bleed valve is open?

Answer 4

Thrust must be limited to idle

Question 5

When does the DUAL BLEED (amber) light illuminate?

Answer 5

APU bleed valve open, and one of the following:

Engine 1 bleed switch on, and/or

Engine 2 bleed switch on AND isolation valve open

Question 6

What does the WING-BODY OVERHEAT (amber) light indicate?

Answer 6

An overheat has been detected:

Engine strut cavity, or 
Wing bleed air duct, or
Wing leading edge, or
Pack, or
Keel beam, or
Aft cargo compartment, or
APU cavity

Question 7

A single pack in high flow mode is capable of maintaining pressurization and acceptable temperature throughout the aircraft up to what altitude?

Answer 7

Maximum certified ceiling

[41,000ft]

Question 8

Which valve pneumatically modulates to control airflow into the respective air conditioning pack based on air condition demands?

Answer 8

Pack valve

Question 9

When does a pack automatically switch to high airflow?

Answer 9

When one pack is not operating

[Inhibited on the ground or airborne with flaps extended]

Question 10

How do the recirculation fans operate with both RECIRC FAN switches in AUTO, and both PACK switches in AUTO?

Answer 10

Both recirc fans would be on

Question 11

Where do the air recirculation fans draw air from?

Answer 11

Collector shroud of forward cargo compartment,

Air conditioning distribution compartment (pack compartment), and

Floor grilles on each side of passenger cabin

Question 12

What does ZONE TEMP (amber) indicate?

Answer 12

A supply duct overheat

[Trim air valve for that zone will close]

Question 13

How do you position PACK switches when using external conditioned air?

Answer 13

PACK switches OFF

Question 14

What controls the temperature of condition air from an external air source?

Answer 14

The external air conditioning cart

Question 15

Packs produce air temperature to satisfy which zone?

Answer 15

The zone requesting the lowest temperature

Question 16

What happens with the failure of the primary flight deck zone temperature control?

Answer 16

Master Caution Recall indicates failure of the flight deck temperature control and will cause an automatic switch to the backup control

Question 17

What temperatures are commanded by positioning all zone temperature selectors to OFF?

Answer 17

75F for the flight deck [left pack] and 65F for the cabin [right pack]

Question 18

What provides an equipment cooling alert if an overtemperature occurs on the ground?

Answer 18

EQUIP COOLING OFF (amber) light, and
MASTER CAUTION, and

Horn in the nose wheel well [ground only]

Question 19

What is the purpose of the overboard exhaust valve (OEV)?

Answer 19

Controls the quantity of equipment cooling exhaust air flowing overboard and has a smoke removal mode.

It closes when a differential pressure is achieved [~1psid]

Question 20

When is the outflow valve position indicator operational?

Answer 20

Anytime, regardless of the pressurization mode

Question 21

When does the OFF SCHED DESCENT (amber) illuminate?

Answer 21

Aircraft begins to descend without reaching the preset cruise altitude

[Within ~0.25 psid]

Question 22

How is pressurization controlled in MAN?

Answer 22

Manual control of the outflow valve

Question 23

What two warnings use the same aural tone (intermittent horn) when activated?

Answer 23

Takeoff configuration, and

Cabin altitude