FCOM: 26 - Fire Protection

Question 1

When the fire push button is pushed (& released), what actions occur?

Answer 1

FLAB SHIP:

FADEC power - isolated
Low pressure fuel valve - closed
Aural warning - silenced
Bleed valve - closed
Squibs - armed
Hydraulic fire shut off valve - closed
IDG - deactivated
Pack flow valve - closed

25/08/2024

Question 2

Explain the fire detection system.

Answer 2

The engines and APU have:
- 2 loops, “A” & “B”
- Fire Detection Unit

Once A+B senses heat above a TEMP the fire warning is triggered.

The loops consist of 3 sensing elements in the engine and 1 sensing element in the APU compartment.

Once an sensing element detects heat a signal is sent to the FDU.

01/11/24