Fire Extinguisher Tube Assembly
Figure 601/TASK 26-21-49-991-006
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
E. Nicks, scratches, Maximum depth cannot be If the damage is more than chafing. more than 10 percent of the allowage limits,
the wall thickness. replace the tube (Ref. TASK 26-21-49-000-003) and (Ref. TASK 26-21-49-400-003).
5. Close-up
________
Subtask 26-21-49-410-056
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the fan cowl doors (Ref. TASK 71-13-00-410-040):
FOR 1000EM1
437AL, 438AR.
FOR 1000EM2
447AL, 448AR.
(3)
Remove the access platform(s).
(4)
Remove the warning notice(s).
Subtask 26-21-49-865-062
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WE1, 2WE1, 1WE2, 2WE2.
APU FIRE EXTINGUISHING - DESCRIPTION AND OPERATION
__________________________________________________
R 1. General
_______ R The APU fire extinguishing system extinguishes fires detected in the APU R compartment. In flight, the crew must operate the system manually from the R cockpit. On the ground, the fire and overheat detection system activates the R extinguishing system automatically. On ground the fire extinguishing system R is only activated by loop A.
R 2. Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------11WF BOTTLE-APU FIRE EXTING 313 314AR 26-22-00 12WF CARTRIDGE-APU FIRE EXTING BOTTLE 313 314AR 26-22-00
R 3. System Description
__________________ (Ref. Fig. 001) The APU fire-extinguishing system has one fire extinguisher bottle. The bottle contains the extinguisher agent. It is hermetically sealed and pressurized with nitrogen. A pressure switch continuously monitors the pressure in the bottle. The bottle is installed in the fuselage, forward of the APU compartment between FR78 and FR79 (the FR79 is the FWD firewall of the APU compartment). The bottle has one discharge outlet which is sealed with a metal diaphragm. A discharge head is installed on the discharge outlet. A distribution pipe connects the discharge head to the outlet in the FWD firewall of the APU compartment. An electrically-operated explosive cartridge is installed in the discharge head. The cartridge has two squibs (squib A and squib B). When electrical power is supplied to the squibs the cartridge fires and ruptures the metal diaphragm in the bottle discharge outlet. The extinguisher agent flows through the distribution pipe directly into the APU compartment. If one squib has a failure the other squib makes sure that the cartridge fires correctly. The bottle also has a pressure relief device which lets the extinguisher agent flow overboard if the pressure in the bottle increases to a given level. If the pressure relief device operates the extinguisher agent flows through the overboard discharge pipe to the discharge indicator. The extinguisher agent pushes the disc out of the discharge indicator housing and flows overboard. The ejected disc shows that the fire extinguisher is no longer serviceable. When the agent is released (into the APU compartment or overboard) the pressure switch on the bottle sends a signal to the APU FIRE panel 1WD in the panel 20VU. The DISCH legend in the AGENT pushbutton switch comes on.
R APU Fire Extinguishing - Component Location Figure 001 (SHEET 1)
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R APU Fire Extinguishing - Component Location Figure 001 (SHEET 2)
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4. Power Supply
____________ (Ref. Fig. 002, 003) The aircraft DC network supplies the APU fire-extinguishing system with electrical power. It supplies 28VDC from:
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