Fire Protection

Question 1

What is a dual loop detection system?

Answer 1

Dual loop and: both have to detect fire (engines)
Dual loop or: only 1 of the 2 has to detect the fire (APU)

Question 2

For a “dual loop and” has a failure of a single loop, how do you know it has failed?

Answer 2

EICAS status message

Question 3

Which engine fire indications can be cancelled?

Answer 3

Master Warning lights
Fire Bell

Question 4

What does pulling the fire discharge handle?

Answer 4

Silence the bell
Arm the squibs
Close HYD shutoff valve and depressurises the engine driven pump
Generator Control breaker opens to protect bus from engine
Fuel Valve/Spar Valve closes
Closes the associate ENG bleed air valve

Question 5

How many extinguishers does 641GT have for the APU?

Answer 5

1

Question 6

When is the fire handle unlocked/released?

Answer 6

With an actual fire on the aircraft

Question 7

Is Cargo Fire an immediate action item checklist?

Answer 7

No, Non normal

Question 8

How is fire detected in the cargo fire system?

Answer 8

Dual detection system. Both detectors must sense smoke

Question 9

How are fire bottles released for a cargo fire?

Answer 9

Either forward or aft. Can’t do both

Question 10

With FWD Cargo Fire, what happens to the packs?

Answer 10

Packs high flow

Question 11

With AFT cargo fire, what happens to the packs?

Answer 11

Packs inhibited from high flow

Question 12

With AFT cargo fire, what happens to the packs?

Answer 12

Packs inhibited from high flow

Question 13

What happens when APU fire handle pulled?

Answer 13

Arms squibs
De-energise Recirc fans
Cargo heat de-energised
Packs inhibited from hi flow
Nitrogen Generation system stops providing to C fuel tank

Question 14

The first APU fire bottle discharge does what?

Answer 14

Fires instantly. Suppression for 30 minutes

Question 15

The second APU fire bottle does what?

Answer 15

Discharges at reduced rate. Lasts for 150 minutes plus 15 minutes provided by boeing

Question 16

Though the main gear logic, what happens to the remaining fire bottles?

Answer 16

Automatically discharged to the fire

Question 17

If one of the engine detection loops fails, what happens?

Answer 17

The remaining loop will reconfigure to detect a fire.
Status message displayed

Question 18

With an APU Fire on the ground, what happens outside the aircraft?

Answer 18

Horn coming from the Nose wheel gear