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26-21-11 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/89
H21896
554 Engine Fire Extinguishing Bottle Installation
Feb 15/81 Figure 401 26-21-11
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(g)
Reconnect electrical connector D584 to the aft bottle discharge squib.
(h)
Close EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(i)
Press EXT TEST press-to-test light on P8-1 fire protection module.
1) Check that the L and R lights illuminate and stay on until press-to-test light is released.
NOTE: Ground for light is through associated selector control valve. Light may not illuminate if valve is faulty.
(3) Restore Airplane to Normal Configuration
(a) Remove electrical power if no longer required.
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ENGINE FIRE EXTINGUISHER BOTTLES - INSPECTION/CHECK
1. Fire Extinguisher Bottle Check
A. Check Bottle Serviceability
(1) Serviceability of the fire extinguisher bottle is determined by removing and weighing bottle. Total weight of bottle (including squib) and freon is provided on nameplate. Replace bottle if weight is 0.10 pound less than that marked on nameplate.
NOTE: Remove squib shunt plug and pressure switch shipping guard and protective cap before weighing.
B. Check Discharge Cartridge (Squib) Service Life
(1) To ascertain unexpired service life of the squib, check the manufacturer’s date stamp on the edge of the squib. See manufacturer’s data for recommended maximum life.
NOTE: If cartridge (squib) is subjected to high temperatures or unusual conditions, service life may vary from value given. For further information, contact HTL ADVANCED TECHNOLOGY, Monrovia, California 91016.
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May 15/77 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-21-11 Page 601
ENGINE SELECTOR CONTROL VALVE - REMOVAL/INSTALLATION
1. Selector Control Valve - Removal/Installation
NOTE: The removal and installation of the selector control valve(s) should be performed one valve at a time. The operational test must be performed at the completion of any removal and installation.
A. Remove Engine Selector Control Valve (Fig. 401)
(1)
Remove electrical connector.
(2)
Disconnect discharge line at each end of valve.
(3)
Remove mounting bolts.
(4)
Remove valve.
B. Install Engine Selector Control Valve (Fig. 401)
(1)
Install O-rings on reducers and install reducers on valve.
(2)
Position valve on mounting bracket and install mounting bolts but do not tighten.
(3)
Connect discharge lines at each end of valve.
(4)
Tighten mounting bolts.
(5)
Replace electrical connector.
C. Perform Operational Test
(1)
Equipment and Materials
(a) Source of compressed air - regulated to 210 ±50 psig, equipped with a pressure gage and an inlet tube with a 0.56-inch (or greater) inside diameter.
(2)
Prepare to Test
(a)
Open EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(b)
Disconnect electrical connectors D582 and D584.
WARNING: ALL BOTTLE DISCHARGE PLUG CONNECTORS MUST BE DISCONNECTED. OPERATION OF FIRE SWITCH WILL DETONATE EXPLOSIVE CHARGES IF CONNECTORS ARE NOT REMOVED FROM DISCHARGE PLUGS.
(c)
Install shunt plug to fire extinguisher bottle squibs.
(d)
Disconnect hose from the fwd bottle discharge plug.
(e)
Connect source of compressed air to the hose.
(f)
Apply electrical power.
(g)
Close EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(3)
Operational Test
(a)
Use an inlet tube with a 0.56-inch (or greater) inside diameter to pressurize system tubing to 210 ±50 psig. Verify no air is escaping from Eng-1 and Eng-2 fire extinguishing discharge outlets, confirming Eng-1 and Eng-2 selector valves are closed.
(b)
Arm No. 1 fire switch by pressing override button behind fire switch handle and pulling up on handle.
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