Fire Protection

Question 0

Is there a cockpit indication for the lavatory smoke detector?

Answer 0

No, only in the cabin on the flight attendant panel

Question 1

What parts of the airplane have fire detection and protection?

Answer 1

Engine cowling
APU
Baggage compartments
Lavatory

Question 2

How many fire loops are there for the engines?

Answer 2

6 total loops in 3 zones. The Primary Engine Zone, the Leading Edge Zone and the Main Wheel Well. Each loop is filled with Helium gas that expands when heated and activates a switch.

Question 3

What happens if a loop loses pressure or electricity?

Answer 3

If a loop loses power or pressure an integrity switch triggers a FAULT A or FAULT B warning light in the cockpit.

Question 4

If either the PEZ loop or the LEZ loop were to fail what indication would you see?

Answer 4

FAULT A
CHECK FIRE DETECT warning light
MASTER WARNING

Question 5

If the PEZ loop or the LEZ loop detects a fire, what indication would you see?

Answer 5

PULL FUEL/HYD OFF handle
MASTER WARNING
CHECK FIRE DETECT warning light
(2) ENGINE FIRE PRESS TO RESET lights

Question 6

If the PEZ detects and failure and the LEZ detects a fire, what would you see?

Answer 6

FAULT A
PULL FUEL/HYD OFF handle
CHECK SMOKE DETECT
MASTER WARNING
(2) ENGINE FIRE PRESS TO RESET

Question 7

If the LEZ fails and the PEZ detects and fire, what would you see?

Answer 7

FAULT A
CHECK FIRE DETECT
MASTER WARNING

Question 8

What indications would you see if the APU loop were to fail?

Answer 8

MASTER WARNING
CHECK SMOKE DETECT
Amber FAULT message on the APU FPP

Question 9

What are the engine fire indications in the cockpit?

Answer 9

PULL FUEL HYD OFF handle
CHECK SMOKE DETECT
MASTER WARNING
(2) ENGINE FIRE PRESS TO RESET

Question 10

How are engine fires extinguished?

Answer 10

There are two cylindrical Halon fire bottles located in the left wing root. Either bottle is capable of being fired into the left or right engine, or both bottles may be fired into the same engine.

Question 11

What happens when you pull the PULL FUEL HYD OFF handle?

Answer 11

Closes the Emergency Fuel Shutoff Valve
Closes the Emergency Hydraulic Shutoff Valve
Arms both the FWD and AFT fire bottles

Question 12

What indications would we see for a Engine Fire Detection Test?

Answer 12

3-1-3

PULL FUEL HYD OFF handle
FAULT A
FAULT B

CHECK SMOKE DETECT

MASTER WARNING
(2) ENGINE FIRE PRESS TO RESET

Question 13

What powers the APU Fire Detection/Protection?

Answer 13

Right 28vDC Essential Bus

Question 14

What happens if the APU loop detects a fire?

Answer 14

The APU will automatically shut itself down and fire its Halon bottle after 7 seconds. This can be confirmed by the BTL LOW light illuminating on the FPP.

Question 15

How many smoke detectors are there on the airplane?

Answer 15

4 total, one in the forward lavatory, one in the forward cargo bin above the door, two in the aft baggage compartment. The lavatory smoke detector will not give any indication in the cockpit if it detects smoke.

Question 16

How many fire extinguishing bottles are there for the cargo compartments and lavatory?

Answer 16

There are three total for the cargo compartments. The Forward bin has a High Rate bottle, the Aft bin has a High Rate Bottle and a Low Rate Bottle which is shared with the forward bin.

The lavatory has its own fire protection bottle located in the ceiling of the trash compartment. It is activated by a thermal wax plug that melts when a certain temperature is reached.

Question 17

What happens when you press the forward baggage compartment extinguish switch?

Answer 17

The fwd high rate bottle and the low rate bottle are both discharged immediately. The aft bottle low light will not illuminate for approximately 45 minutes after it is discharged. This indicates the bottle is fully depleted.

Question 18

What are the indications for a Forward Cargo Compartment fire?

Answer 18

MASTER WARNING
SMOKE warning light
FWD BTL ARM light
SMOKE/EXTG light

Question 19

What are the indications for an Aft Cargo Compartment fire?

Answer 19

MASTER WARNING
SMOKE warning light
AFT BTL ARM light
SMOKE/EXTG light
Inlet vent closed light
Outlet vent closed light

Question 20

What happens when you press the Aft SMOKE/EXTG light?

Answer 20

The High Rate bottle discharges and the BTL LOW light will illuminate immediately. The Low Rate bottle will discharge approximately 7 minutes later and will last for 45 minutes.

Question 21

Why are there two test positions for the Aft Fire Detector System?

Answer 21

There are two smoke detectors.