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757
MAINTENANCE MANUAL

SQUIB TEST

SQUIB TEST PANEL

Squib Test Component Location
Figure 601

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757 MAINTENANCE MANUAL
 E.  Put the airplane back to its usual condition. S 866-019
 (1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
 APU FIRE EXTINGUISHING SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________________
 1.  General_______
 A.  The APU fire extinguishing system has controls in two locations that release one application of fire extinguishing agent to a fire in the APU compartment. The system has test capability.
 B.  The APU fire extinguishing system includes the APU fire extinguisher bottle located forward of the APU firewall, the APU/CARGO fire control panel on pilots' aft control stand P8, the P62 APU shutdown remote control panel on the nosegear, and the squib test panel located on the P61 right side panel.
 C.  The APU fire extinguishing system receives power from the 28 vdc hot battery bus, through a circuit breaker on main power distribution panel P6.
 (1)  The APU shutdown remote control panel P62 is located on the nose landing gear. P62 contains a red APU FIRE LIGHT, APU SHT DN/C.O. SWITCH, and APU BTL DISCH SWITCH. When a fire is detected in the APU compartment, the APU FIRE LIGHT comes on, and a warning horn sounds. Pressing APU SHT DN/CO shuts down the APU and arms the remote APU bottle discharge. Pressing APU BTL DISCH SWITCH discharges the APU fire bottle. If APU SHT DN/C.O. SWITCH is pressed, the APU remote fire indication power must be recycled OFF and ON to reset the system, otherwise fire horn is disabled.
 2.  Component Details (Fig. 1)_________________
 A.  APU Fire Extinguisher Bottle
 (1)  
One APU fire extinguisher bottle is found forward of the APU fire wall on the lower right side. The extinguisher bottle includes a squib cartridge, pressure switch, and the combined safety relief and filler port.

 (2)  
The squib cartridge located on the discharge valve, when detonated, ruptures a retaining disc in the valve releasing the extinguishing agent.

 (3)  
ON GUN 051; The pressure switch detects a decrease in bottle pressure and activates the bottle discharge lights. The pressure switch can be tested using the manual override test hex key.

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MAINTENANCE MANUAL

SEE B
SEE C
SEE A
FLIGHT COMPARTMENT
ARMED ARMED APU BTL
ww
DISCH a
r rA

C
FWD AFT
APU SHUTDOWN REMOTE CONTROL
R
G

PANEL, P62, LOCATION
O
1-BTL DISCH-2
F

DISCH
I

r r
R
w wE

L00401
LIGHT-FIRE APU

DISCH DISCH
　
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