Fire Protection

Question 1

When will an ENG 1/2 OVERHEAT illuminate? ENGINE 1/2 FIRE?

Answer 1

When the temperature in the engine detector exceeds a predetermined limit. They will extinguish when the temperature is brought below the limit.

Question 2

The engines have a dual loop fire detector. With the OVHT DET in the normal position, which loop(s) must detect the overheat for it to be indicated?

Answer 2

Both

Question 3

How will the crew know if a single OVHT DET loop has failed?

Answer 3

The OVHT/FIRE test is conducted. There is no flight deck indication normally

Question 4

Switching the OVHT DET to either A or B does what?

Answer 4

Will indicate an overhead or fire if the selected detector indicates a fire. Single loop mode

Question 5

What does the FAULT light on the fire panel indicate?

Answer 5

Both detector loops have failed and the overheat/fire detection system is inoperative

Question 6

With the OVHT DET in either A or B and the FAULT light illuminates, this means what?

Answer 6

The selected loop has failed and the system is inoperative

Question 7

What are the successful FAULT INOP test indications?

Answer 7

Both master cautions illuminate
The OVHT/DET system annunciator light illuminates
the FAULT light illuminates
APU DET INOP light illuminates

Question 8

What are the successful OVHT FIRE test indications?

Answer 8

Both master fire warnings illuminate
Both master caution lights illuminate
The OVHT/DET system system annunciator light illuminates
The APU fire switch illuminates
Both engine fire switches illuminate
Both ENG OVERHEAT lights illuminate
The WHEEL WELL fire warning light illuminates
The fire warning bell sounds

Question 9

T/F: The wheel well fire detection and WHEEL WELL fire warning light only operate when AC power is applied to the aircraft

Answer 9

True

Question 10

Holding the EXT TEST switch to position 1 tests the circuit continuity of squib ___ (1/2) on ____ (1/2/Both) engine(s) extinguisher bottle(s).

Answer 10

Holding the EXT TEST switch to position 1 tests the circuit continuity of squib 1 on both engines extinguisher bottles.

Question 11

Holding the EXT TEST switch to position 2 tests the circuit continuity of squib ___ (1/2) on ____ (1/2/Both) engine(s) extinguisher bottle(s).

Answer 11

Holding the EXT TEST switch to position 2 tests the circuit continuity of squib 2 on both engines extinguisher bottles.

Question 12

How is the APU squib tested with the EXT TEST switch?

Answer 12

The same squib is tested twice with the switch in position 1 or 2

Question 13

The indications of an engine overheat are:

Answer 13

Both master cautions illuminate
The OVHT/DET annunciator illuminates
The related ENG OVERHEAT light illuminates

Question 14

The indications of an engine fire are:

Answer 14

Both master cautions illuminate
The OVHT/DET annunciator illuminates
The related ENG OVERHEAT light remains illuminated Both master FIRE WARN lights illuminate
Related engine fire switch illuminates and unlocks

Question 15

What can you do if an engine is indicating a fire and the related handle unlock does not work?

Answer 15

There is a manual unlock switch below the fire handle that will unlock the fire handle

Question 16

The APU fire detection is powered by what?
APU fire extinguishing?
Can the APU fire extinguishing be activated without electrical power ON in the flight deck?

Answer 16

Detection: battery bus
Extinguishing: Hot battery bus
Yes

Question 17

Will the APU automatically shut down if a fire is detected? If so, when?

Answer 17

Yes, always

Question 18

The APU is a ____ loop system? Single/Dual

Answer 18

Single

Question 19

What does the APU DET INOP light indicate?

Answer 19

The single loop has failed and APU fire detection is inoperative

Question 20

Where is the remote APU fire control panel?

Answer 20

Right main wheel well

Question 21

An APU fire is sensed, what is indicated on the remote APU fire control panel?

Answer 21

APU fire warning light flashes

The APU warning horn sounds (on the ground only)

Question 22

What happens if you press the HORN CUTOUT button on the APU remote panel during a fire warning

Answer 22

The horn will stop and the fire warning light will become steady

Question 23

Pulling the APU remote fire control handle does what?

Answer 23

Arms the APU BOTTLE DISCHARGE switch

Closes the APU fuel shutoff valve

Closes the APU bleed air shutoff valve

Closes the APU inlet door

Trips generator control relay and breaker

Question 24

The flight deck indications of an APU fire are:

Answer 24

Both master FIRE WARN
lights illuminate

The fire warning bell sounds

The APU fire switch illuminates and unlocks

Question 25

Pulling the APU FIRE switch does what?

Answer 25

Arms the APU fire extinguisher bottle squib Closes the APU fuel shutoff valve and deactivates the fuel solenoid Closes the APU bleed air valve Closes the APU air inlet door Trips the APU generator control relay and breaker Allows the APU fire switch to be rotated for discharge

Question 26

The forward cargo compartment has ___ smoke detectors while the aft cargo has ____ smoke detectors

Answer 26

Forward - 4 Aft - 6

Question 27

When the cargo fire detector switch is in NORM, how many loops must detect fire to receive and indication?

Answer 27

Both loops for the respective cargo compartment

Question 28

When will the DETECTOR FAULT light illuminate on the cargo fire panel?

Answer 28

When both loops in either cargo compartment have failed

Question 29

The indications for a successful cargo fire test are:

Answer 29

Both Master FIRE WARN lights illuminate Extinguisher test lights illuminate (verifies squib circuit continuity) FWD and AFT cargo fire warning lights illuminate Cargo fire bottle DISCH light illuminates The DETECTOR FAULT light remains extinguished The fire warning bell sounds

Question 30

When will the DETECTOR FAULT light illuminate during a fire test?

Answer 30

When one or more detectors in a fire loop have failed

Question 31

When will the cargo fire system indicate a fire?

Answer 31

When at least one detector in both loops detect smoke

Question 32

What are the flight deck indications of a cargo fire?

Answer 32

Both master FIRE WARN lights illuminate FWD or AFT cargo fire warning light illuminates Fire warning bell sounds

Question 33

How many cargo fire bottles are installed?

Answer 33

One per aircraft... Select 737-700's have a second bottle installed to meter the discharge at a low rate.

Question 34

When smoke is detected in the lavatory, what happens?

Answer 34

The lavatory call light located above the lavatory door and master lavatory call light flash The passenger address system sounds a chime that cycles on/off Red alarm indicator light on the lavatory smoke detector panel illuminates The smoke detector emits an audible horn as long as smoke is detected

Question 35

Describe the lavatory fire extinguisher

Answer 35

There is an automatic fire extinguishing bottle in the lavatory under the sink. The extinguisher has two discharge ports that melt at high temperatures and discharge into the lavatory sink compartment. There is no flight deck indication of a discharge.

Question 36

Which wheel wells have fire detection?

Answer 36

Mains only. No nose gear

Question 37

What are the flight deck indications of a wheel well fire?

Answer 37

Both master FIRE WARN lights illuminate WHEEL WELL fire warning light illuminates Fire bell sounds

Question 38

How can a WHEEL WELL fire be combated?

Answer 38

No fire extinguishing system... Lowering the landing gear increases airflow and cools the wheel well. Light will remain illuminated until temperature has decreased below set level