Street's NATOPS Chapter 2 Fire Extinguishing System HSM-50

Question 1

Bottles are filled with __ and charged with __

Answer 1

halon, nitrogren

Question 2

With no AC power, must use

Answer 2

Reserve

Question 3

Which engine has no fire extinguisher capability without AC power?

Answer 3

No 2

Question 4

When No 1 & APU T handles pulled, fire extinguishing agent will discharge into

Answer 4

Compartment for the T handle that was last actuated

Question 5

How many fire detectors and where?

Answer 5

5 - 2 in each engine, 1 in APU

Question 6

Fire detection test - 1

Answer 6

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

Question 7

Fire detection test No 2

Answer 7

Continuity of the 2 engine deck mounted detectors

Question 8

Newer Fire Detectors

Answer 8

Aircraft configured with newer IR flame detectors will result in up to a 5 second delay in T-Handle lights extinguishing following FIRE DETR TEST knob movement.

Question 9

False indication of APU fire

Answer 9

During APU start, temporary illumination of the APU T-Handle for approximately 3 seconds may be a false indication of an APU fire.

Question 10

Fire Extinguisher Logic Module

Answer 10

Determines which compartment and which CADS to fire based on switch and T-Handle positions.

Question 11

Activating Multiple T-Handles at Once

Answer 11

When AC power is available, activation of multiple T-Handles may result in both bottles being fired at the same time, leaving no reserve capability.

Question 12

Impact Switch

Answer 12

A multiple axis impact (10G) sensor is mounted to the airframe. When crash impact forces are detected, the switch is activated via power from the Battery utility bus, discharging one fire bottle into each engine compartment.

Question 13

5 Functions of the APU T Handle

Answer 13

Removes power from APU airframe fuel shutoff valve

Removes power from prime boost pump, sends stop signal to DESU,

Arms fire extinguisher system

Points DCV to APU compartment