(b)
214 Mix Manifold Bay
(c)
121 Control Cabin - Left
(d)
122 Control Cabin - Right
(2)
Access Panels
(a) 4404R, Forward Cargo Door
E. Prepare for test
(1)
Open this circuit breaker and install DO-NOT-CLOSE tag:
(a) Circuit Breaker Panel P6 or P18:
1) CARGO FIRE EXT 1
(2)
Open 4404R, Forward Cargo Door.
(3)
Remove lining at aft end of forward cargo compartment to gain access to the cargo fire bottle (AMM 25-52-131/401).
(4)
If needed, remove the air conditioning duct in front of the cargo compartment fire bottle, (AMM 21-21-11/401).
F. Discharge Tube Pressure Test
WARNING: DO NOT REMOVE PARTS THAT ARE UNDER PRESSURE. THIS CAN CAUSE INJURY TO PERSONNEL OR DAMAGE TO PROPERTY. SPEAK TO THE SAFETY ENGINEER FOR THE NECESSARY SAFETY PRECAUTIONS.
(1)
Remove discharge tubes from discharge outlets on cargo fire bottle.
CAUTION: APPLY PRESSURE SLOWLY TO THE FIRE EXTINGUISHING TUBING.
(2)
Connect pressure source to the cargo fire bottle forward discharge tube.
(3)
Install plugs in discharge nozzle tubing in forward cargo compartment.
(4)
Pressurize discharge tubing to 50-55 psig.
(a) Wait at least 3 minutes for air pressure to stabilize.
(5)
Turn off pressure source.
(a)
Record stabilized air pressure.
(b)
Wait 10 minutes, then check the pressure.
1) Ensure pressure loss during the 10-minute waiting period does not exceed .5 psig.
(6)
Bleed discharge tubing to 0 psig, then disconnect pressure source.
(7)
Remove plugs from discharge nozzle tubing, and reinstall discharge nozzles.
(a) Tighten to 45-55 pound-feet and install lockwire.
(8)
Connect air source to cargo fire bottle aft discharge tube.
(8)
Install plugs on discharge nozzles in aft cargo compartment.
(10)
Pressurize discharge tubing to 50-55 psig.
(a) Wait at least 3 minutes for air pressure to stabilize.
(11)
Turn off pressure source.
(a)
Record stabilized air pressure.
(b)
Wait 10 minutes, then check the pressure.
1) Ensure pressure loss during the 10-minute waiting period does not exceed .5 psig.
(12)
Bleed discharge tubing to 0 psig, then disconnect pressure source.
(13)
Remove plugs from discharge nozzle tubing, and reinstall discharge nozzles.
(a) Tighten to 45-55 pound-feet and install lockwire.
(14)
Connect discharge tubes to discharge outlets on the fire bottle.
(a)
Apply a layer of compound BMS3-27 to the outlet threads, outlet end and outlet inner diameter where tube assembly attaches to discharge head.
(b)
Connect discharge tube assembly to discharge head.
NOTE: Yellow indicates the plumbing that supplies halon to the forward cargo compartment. Blue indicates plumbing that supplies halon to the aft cargo compartment.
(c)
Remove any excess compound BMS3-27.
(d)
Tighten discharge tubing to 266-294 inch-pounds for the FWD connector (1/2-inch) and 342-378 inch-pounds for the AFT connector (5/8-inch).
550
26-25-0 Page 508 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
G. Return Airplane to its Normal Condition
(1)
If removed, install air conditioning duct in front of cargo fire bottle (AMM 21-21-11/401).
(2)
Install lining at aft end of forward cargo compartment (AMM 25-52-131/401).
(3)
Close 4404R, Forward Cargo Door.
550
May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-25-0 Page 509
CARGO COMPARTMENT FIRE EXTINGUISHING SYSTEM - CLEANING/PAINTING
EFFECTIVITY
737-200 Passenger Airplanes Incorporating SB 26A1081
1. General
A. This procedure has tasks to clean the cargo fire extinguishing system.
B. The cargo fire extinguishing system should be cleaned whenever the cargo fire bottle has been discharged.
C. Only components in the compartment in which the cargo fire bottle was discharged need to be cleaned.
D. Cleaning procedures are the same for the forward and aft cargo compartment systems.
2. Cargo Fire Extinguishing System Cleaning
A. Equipment
(1) Air pressure source - capable of supplying 30-40 psig.
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