Fire Protection

Question 1

Engine, APU: Fire Detection / Protection power supply?

Answer 1

Detection: Battery Bus
Extinguishing: Hot Battery Bus

Question 2

Engine Fire Loop:

• Indication of 1 Loop Failed
• Indication of 2 Loops Failed

Answer 2

1 - FAULT Only annunciated during test

2 - FAULT (No Master Caution)

Question 3

Fault Inop Test

Answer 3

Tests Fault Detection Circuits (Ability of the system to detect a fault)

Question 4

Overheat Test

Answer 4

Simulates a Fire / Overheat in both loops

Tests fire loops

Question 5

EXT Test

Answer 5

1 - Tests circuit continuity for Squib 1 (Engine + APU)

2 - Squib 2, retests APU

Question 6

Pulling Fire Switch:

Answer 6

• Engine + Spar Fuel SOV close
• Bleed Air SOV closes
• Hydraulic SOV closes
• Generator Trips Off
• Reverser Disabled
• 1 Discharge Squib / Bottle Armed

Question 7

APU DET INOP

Answer 7

The APU Fire Detection Loop has failed

Question 8

Pulling the APU Fire Switch:

Answer 8

• FSOV Closes
• Bleed SOV Closes
• Generator Trips Off
• APU Air Inlet Door closes
• Arms Fire Bottle Squib

Question 9

Cargo Smoke Detector # and loop arrangement

Answer 9

FWD: 4 Detectors, 2 loops of 2
AFT: 6 Detectors, 2 loops of 3

Question 10

DETECTOR FAULT

Answer 10

Both loops in a cargo compartment failed.

During test only: 1 or more loops failed

Question 11

Wheel well fire detection / protection

Answer 11

1 electric loop (AC) in main wheel well only.

No protection