Fire

Question 1

What does the fire-detection system provide in the cockpit?

Answer 1

Visual indication of infrared radiation

Question 2

How many sensors are included in the fire-detection system?

Answer 2

Five sensors (two in each engine compartment and one in the APU compartment)

Question 3

What happens when a sensor detects infrared radiation and no blue light?

Answer 3

It sends a signal to the associated control amplifier, activating both master warning panel FIRE lights and the proper T-handle lights

Question 4

What are older cadmium sulfide optical detectors susceptible to?

Answer 4

Sunlight filtered through smoke or haze, or at sunrise or sunset

Question 5

What is the purpose of the FIRE DETR TEST rotary knob?

Answer 5

To check the continuity of the wiring, amplifiers, and FIRE lights

Question 6

What does the 1 position of the FIRE DETR TEST knob check?
(H: How many on the wall)

Answer 6

Continuity of the three firewall-mounted detectors (No. 1 engine, No. 2 engine, and APU)

Question 7

True or False: Newer IR flame detectors are designed to eliminate false alarms.

Answer 7

True

Question 8

What is the delay in T-handle lights extinguishing for aircraft with newer IR flame detectors?

Answer 8

Up to 5 seconds delay following FIRE DETR TEST knob movement

Question 9

Fill in the blank: The system consists of _______ control amplifiers.

Answer 9

[three]

Question 10

What is the main function of the fire extinguishing system?

Answer 10

To provide a two-shot capability to extinguish fires in the main engine compartments or the APU compartment

The system includes a main and reserve shot of Halon for fire suppression.

Question 11

What are the bottles filled with and what charges them?

Answer 11

Two bottles filled with Halon and charged with nitrogen

These bottles are mounted on the upper deck, one fore and one aft of the APU compartment.

Question 12

What indicates thermal discharge in the extinguishing system?

Answer 12

The loss of the red plastic disc on the left side of the aircraft

Each bottle also has a pressure gauge and a thermal discharge relief port.

Question 13

What happens when the T-handle for an engine is pulled?

Answer 13

Arms the system and places the fuel selector in the OFF position

The fire-extinguisher logic module selects the compartment for Halon discharge.

Question 14

What occurs when the APU T-handle is pulled?

Answer 14

Closes the fuel shutoff valve, removes power from the prime boost pump, and sends a stop signal to the ESU

It also positions the extinguisher directional control valve to the APU compartment.

Question 15

What happens when the FIRE EXTGH switch is held in the MAIN position?

Answer 15

The first shot of Halon will be discharged into the selected compartment.

Question 16

Which compartments can receive the first shot of Halon when the switch is in the MAIN position?

Answer 16

• No. 1 engine
• APU from the forward bottle
• No. 2 engine from the aft bottle

Question 17

When should the RESERVE position be used to discharge the agent?

Answer 17

If the No. 2 dc primary bus is not energized (no ac power).

Question 18

What compartments can be discharged into from the RESERVE position?

Answer 18

• APU or No. 1 engine compartment from the aft bottle
• No. 2 engine from the forward bottle

Question 19

What happens to the No. 2 engine compartment without ac power?

Answer 19

It has no fire extinguisher capability.

Question 20

What occurs if I try to activate both the No. 1 Engine and APU T-handles?

Answer 20

The last T-handle actuated will be the one armed.

Question 21

What may happen if multiple T-handles are activated when ac power is available? ( Not a copy, think about it)

Answer 21

Both bottles may be fired at the same time, leaving no reserve capability.

Question 22

What type of sensor is used if the A/C was to crash and how many Gs can it detect?

Answer 22

Impact (10g) sensor detects crash impact forces.

Question 23

What happens when crash impact forces are detected by the impact switch?

Answer 23

One fire bottle is discharged into each engine compartment.

Question 24

What power source activates the impact switch during a crash?

Answer 24

Power from the Battery Utility bus.