09 Fire Protection

Question 1

What happens when LH (RH) ENG FIRE PUSH switch/light is pressed?

Answer 1

• Firex bottle squibs are armed
• BOTTLE 1 (2) ARMED PUSH TO DISCH illuminate
• Engine generator shuts down
• Fuel shutoff valve (SOV) closes
• Hydraulic shutoff valve (SOV) closes
• Bleed air shutoff valve (SOV) closes
• Assosiated engine igniters disabled

Question 2

During “Normal Power-Up Check” step 13:
Firex MONITOR system test, what 6 advisory messages appear?

Answer 2

R ENG SQUIB 2 OK
R ENG SQUIB 1 OK
L ENG SQUIB 2 OK
L ENG SQUIB 1 OK
APU SQUIB 2 OK
APU SQUIB 1 OK

Question 3

During “Normal Power-Up Check” step 14: Firex DETECTION system test, what happens when switch is pushed to “FAIL”

Answer 3

5 Caution messages:

R JETPIPE OVHT
R ENGINE FIRE
L JETPIPE OVHT
L ENGINE FIRE
APU FIRE

Question 4

During “Normal Power-Up Check” step 14:
Firex DETECTION system test, what happens when switch is pushed to “WARN”

Answer 4

• Fire bell sounds

5 red lights
* All “FIRE PUSH” & “MASTER WARNINGS” lights illuminates.

3 green lights
* All “BOTTLE ARMED PUSH TO DISCH” lights

5 EICAS WARNINGS:
R JETPIPE OVHT
R ENGINE FIRE
L JETPIPE OVHT
L ENGINE FIRE
APU FIRE

Question 5

What happens when APU FIRE PUSH switch/light is pressed?

Answer 5

• Firex bottle squibs are armed
• APU BOTTLE BOTTLE ARMED PUSH TO DISCH illuminate
• APU shuts down
• Fuel shutoff valve (SOV) closes
• Negative-G shutoff valve (SOV) closes
• APU LCV closes
• APU generator shuts down

Question 6

How many APU fire bottles and squibs?

Answer 6

1 bottle
2 squibs (for redundancy)
(Both squibs fires at the same time)