Environmental

Question 0

Which cargo bay is supplied with conditioned air?

Answer 0

-aft cargo bay

Question 1

How are the packs operated?

Answer 1

• electrically controlled

- pneumatically operated

Question 2

How many smoke detectors in the cargo bay?

Answer 2

• 3 forward cargo bay

- 2 aft cargo bay

Question 3

What ensures that the aircraft remains unpressurized on the ground?

Answer 3

• ground valve

- open on ground, closed in flight

Question 4

Normal max operating pressure?

Answer 4

8.4 PSID

Question 5

Max pressure differential

Answer 5

8.7 PSID

Question 6

How long until the ground valve opens?

Answer 6

Approximately 60 seconds

Question 7

Where are the packs located?

Answer 7

Aft equipment bay

Question 8

How are the safety valves operated?

Answer 8

Pneumatically

Question 9

How many safety valves are installed?

Answer 9

2

Question 10

What is the purpose of the safety valves?

Answer 10

To prevent cabin over pressurization and negative pressurization

Question 11

What is the purpose of the microprocessor (CPAM)?

Answer 11

• automatically drops passenger masks at 14,000 feet
• limits cabin altitude to 14,500 feet +/- 500 feet
• controls opening and closing speed of the ground valve

Question 12

When will the ground valve open?

Answer 12

After touchdown, approximately 60 seconds

Question 13

Will the EMER DEPRESS switch override the automatic and manual controllers?

Answer 13

Yes

Question 14

Which pack supplies the cabin and which supplies the cockpit?

Answer 14

• left pack cockpit

- right pack cabin

Question 15

What happens when the engine START switch is pressed?

Answer 15

Pack valves are automatically closed

Question 16

If both air conditioning systems fail, what can be used to ventilate the aircraft?

Answer 16

Ram air from the scoop (enters the mixing manifold)

Question 17

How are the CRT screens cooled?

Answer 17

2 fans, one on the ground and one in the air

Question 18

If both CRT cooling fans fail what other protection is available?

Answer 18

Selecting standby removes power from the fans and allows air from the flight deck air conditioning duct to cool the CRTs

Question 19

During ground operations, where is the air used to cool the CRTs and electronic equipment dumped?

Answer 19

Overboard through the ground valve

Question 20

When is the cabin pressurization controller switched to the other channel?

Answer 20

3 minutes after landing

Question 21

CABIN ALT caution message

Answer 21

Cabin altitude greater than or equal to 8,500 ft

Question 22

CABIN ALT warning message

Answer 22

Cabin altitude greater than or equal to 10,000 ft

Question 23

DIFF PRESS warning message

Answer 23

Cabin pressure equal to or greater than 8.6 PSI

Question 24

How many outflow valves are installed?

Answer 24

1 valve

Question 25

What is the cabin pre-pressurized to?

Answer 25

-150 feet

Question 26

How long will the CPC maintain pre-pressurization mode after takeoff?

Answer 26

10 minutes