Fire Protection

Question 1

Explain the indications of an engine overheat

Answer 1

• The related ENG OVERHEAT light illuminates
• The OVHT/DET system annunciator light illuminates
• Both MASTER CAUTION lights illuminate

VOL 2 / 8.1.3

Question 2

Explain the function of the Engine Fire Warning switch

Answer 2

Illuminated red:
- indicates fire in related engine
- unlocks related engine fire warning switch
- Master FIRE WARN lights illuminate and fire warning bell sounds

In normal position:
- mechanically locked if no fire signal

Up:
- arms one discharge squib on each fire extinguisher
- allows engine fire warning switch to rotate

Rotate (left or right):
- discharges related fire bottle

VOL 2 / 8.1.1

Question 3

Explain the function of the APU Fire Warning Switch

Answer 3

Illuminated red:
- indicates fire in APU
- unlocks APU fire warning switch
- Master FIRE WARN lights illuminate and fire warning bell sounds

In normal position:
- mechanically locked if no fire signal

Up:
- arms APU extinguisher circuit
- allows APU fire warning switch to rotate

Rotate (left or right):
- discharges APU fire bottle

VOL 2 / 8.1.1

Question 4

Explain the meaning of the FAULT light on the Overheat/Fire Protection panel

Answer 4

With the OVHT DET switch in NORMAL - the FAULT light indicates BOTH detector loops for an engine have failed.

If ONE loop fails with the OVHT DET switch in NORMAL, that loop is automatically deselected and the remaining loop functions as a single loop detector. There is NO flight deck indication of single loop failure.

With the overheat detector switch in A or B - the FAULT light indicates the selected loop for that engine has failed.

Note: MASTER CAUTION and OVHT?DET system annunciator lights do NOT illuminate for a FAULT light

Illuminated red:
- indicates fire in related engine
- unlocks related engine fire warning switch
- Master FIRE WARN lights illuminate and fire warning bell sounds

In normal position:
- mechanically locked if no fire signal

Up:
- arms one discharge squib on each fire extinguisher
- allows engine fire warning switch to rotate

Rotate (left or right):
- discharges related fire bottle

VOL 2 / 8.1.3

Question 5

Explain the meaning of the APU DET INOP light

Answer 5

Indicates the APU detector loop has failed.

MASTER CAUTION and OVHT/DET system annunciator lights illuminate

Illuminated red:
- indicates fire in related engine
- unlocks related engine fire warning switch
- Master FIRE WARN lights illuminate and fire warning bell sounds

In normal position:
- mechanically locked if no fire signal

Up:
- arms one discharge squib on each fire extinguisher
- allows engine fire warning switch to rotate

Rotate (left or right):
- discharges related fire bottle

VOL 2 / 8.1.3

Question 6

Explain the meaning of an illuminated DETECTOR FAULT light on the Cargo Fire panel

Answer 6

One or more of the selected detector loop(s) in either cargo compartment has failed

Illuminated red:
- indicates fire in related engine
- unlocks related engine fire warning switch
- Master FIRE WARN lights illuminate and fire warning bell sounds

In normal position:
- mechanically locked if no fire signal

Up:
- arms one discharge squib on each fire extinguisher
- allows engine fire warning switch to rotate

Rotate (left or right):
- discharges related fire bottle

VOL 2 / 8.1.4

Question 7

Explain the function of the Detector Select (DET SELECT) switches on the Cargo Fire Panel

Answer 7

NORM - detection loop A and B are active
A - detection loop A is active
B - detection loop B is active

Note: the system can be manually converted to single-loop detection through the DETECT SELECT switch on the cargo fire control panel. In the event of a power failure in one loop, the system automatically converts to single-loop detection

Illuminated red:
- indicates fire in related engine
- unlocks related engine fire warning switch
- Master FIRE WARN lights illuminate and fire warning bell sounds

In normal position:
- mechanically locked if no fire signal

Up:
- arms one discharge squib on each fire extinguisher
- allows engine fire warning switch to rotate

Rotate (left or right):
- discharges related fire bottle

VOL 2 / 8.1.4

Question 8

Recall the indications of an engine fire warning

Answer 8

• Related engine fire warning switch illuminates
• Both master FIRE WARN lights illuminate
• The fire warning bell sounds
• All related engine overheat alert indications illuminate (aka both master caution lights with an OVHT/DET annunciator)

VOL 2 / 8.2.2.1

Question 9

Recall the indications of an APU fire warning

Answer 9

• APU fire warning bell sounds
• Both master FIRE WARN lights illuminate
• The APU fire switch illuminates
• The APU automatically shuts down
• The wheel well APU fire warning horn sounds (on the ground only), and the wheel well APU fire warning light flashes (in the right wheel well, not in the flight deck)

Note: the APU automatically shuts down (all related APU FAULT light indications illuminate)

VOL 2 / 8.2.3.1

Question 10

Recall the indications of a Cargo Fire Warning

Answer 10

• The Fire Warning Bell sounds
• Both Master FIRE WARN lights illuminate
• The FWD/AFT Cargo fire warning light(s) illuminate (on the cargo fire panel on center console)

Note: No master caution lights

VOL 2 / 8.2.5.2

Question 11

Explain the meaning of an illuminated Fire Bottle Discharge light

Answer 11

Indicates related fire extinguisher bottle has discharged

VOL 2 / 8.1.3

Question 12

Recall the number of fire extinguishing bottles available for Engine, APU and the Cargo compartments

Answer 12

Engine - 2 extinguishing bottles (total, 2 for 1 engine or 1 for each engine)

APU - 1 extinguishing bottle

Cargo - 1 extinguishing bottle

Note: some aircraft, mainly for ETOPS, have 2 cargo extinguishing bottles which is what I’m used to - also noted in 8.2.5.3

VOL 2 / 8.2.2.2 & 8.2.3.2 & 8.2.5.3

Question 13

True or False:
With the engine overheat deterctor switches in NORMAL, the FAULT light will illuminate when BOTH detector loops for an engine have failed

Answer 13

TRUE

ESV-SA: Fire Protection

Question 14

What is the meaning of an engine L or R BOTTLE DISCHARGE light on the OVERHEAT/FIRE protection panel?

Answer 14

Related fire bottle has been discharged

Note: Related fire bottle squib is armed when the engine FIRE WARN light comes on the handle.

ESV-SA: Fire Protection

Question 15

Pulling the engine fire warning switch UP:

select all that apply

Answer 15

• arms one discharge squib on each engine fire extinguisher
• allows the engine fire warning switch to rotate (unlocks the handle)

Engine fire warning switch doesn’t do anything with the cargo fire system.

ESV-SA: Fire Protection

Question 16

The NORM position of the Detector Select switch on the Cargo Fire panel is used to:

Answer 16

Activate detection loops A and B

Note: there’s two loops per cargo compartment and you want both working for redundancy. If it’s on both, they both are functioning. You can isolate A and B to determine if one is broken but it’s usually on both.

ESV-SA: Fire Protection

Question 17

The indications of an APU fire is:

Answer 17

All of the above:

• The fire warning bell sounds
• both master FIRE WARN lights illuminate
• the APU fire warning switch illuminates

ESV-SA: Fire Protection

Question 18

How is an APU detector loop failure indicated on the Overheat/Fire Protection panel?

Answer 18

APU DET INOP light illuminated

Note: that light does NOT flash. FAULT light is for the engine detector loops, no the APU

ESV-SA: Fire Protection

Question 19

The APU Fire Warning switch in the up position:

Select all answers that apply

Answer 19

• Arms the APU extinguisher circuit (any lit up fire handle arms the fire extinguishers!! they say fire “switches” but they are damn handles)
• allows the APU fire warning switch to rotate (any lit up fire handle “unlocks” the handle and allows it to rotate!!)

ESV-SA: Fire Protection

Question 20

What are the indications of an engine fire warning?

Select all that apply

Answer 20

• Both MASTER FIRE WARNING lights illuminate
• Fire warning bell sounds
• Related Engine Fire Warning switch (handle) illuminates

Question 21

The cargo fire extinguishing system consists of ___ cargo fire extinguisher bottle (s)

Answer 21

1

Note: unless it has 2. ha.

ESV-SA: Fire Protection

Question 22

A failed detector during a cargo fire test indicated by:

Answer 22

An illuminated DETECTOR FAULT light.

Note: the light does NOT flash.

ESV-SA: Fire Protection

Question 23

What are the indications of an engine overheat? aka FIRE.

Answer 23

All of the above.

• The related ENG OVERHEAT light illuminates
• The OVHT/DET system annunciator light illuminates
• Both MASTER CAUTION lights illuminate

ESV-SA: Fire Protection

Question 24

The indications of a cargo fire warning is:

Answer 24

All of the above.

• The fire warning bell sounds
• The FWD/AFT cargo fire warning light(s) illuminates
• Both master FIRE WARN lights illuminate

Note: MASTER CAUTION lights don’t illuminate for cargo fires. Guess it’s not that important baha

ESV-SA: Fire Protection

Question 25

What is NOT an indication of an engine fire warning?

Answer 25

• ENG light illuminated on the recall panel

Note: master recall is for single faults/failures that aren’t a total failure of a system. An engine fire warning is a big deal, to big o deal for just a master recall.

Fire Protection CBTs