(2)
Remove DO-NOT-CLOSE tag and close this circuit breaker:
(a) Circuit Breaker Panel P6 or P18:
1) CARGO FIRE EXT 1
(3)
Close 4404R, Forward Cargo Door.
(4)
Remove electrical power if not needed (AMM 24-22-0/201).
4. Cargo Fire Extinguishing Discharge Tube Flow Test (Fig. 502)
A. General
(1) The cargo fire extinguishing discharge tube flow test ensures there is nothing blocking flow through the discharge tubes.
B. Equipment
(1) Source -Air pressure, capable of supplying 30-40 psig.
C. Consumables
(1) C00913 Compound, Non-drying Resin Mix Corrosion-Inhibiting Material -BMS3-27
D. Access
(1)
Location Zones
(a)
213 Forward Cargo Compartment
(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 necessary, remove the air conditioning duct in front of the cargo compartment fire bottle, (AMM 21-21-11/401).
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26-25-0 Page 506 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/01
F. Cargo Fire Extinguishing Discharge Line Flow 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 tube from discharge outlets on cargo fire bottle.
CAUTION: APPLY PRESSURE SLOWLY TO THE FIRE EXTINGUISHING TUBING.
(2)
Connect the pressure source to the cargo fire bottle forward discharge tube.
(a)
Ensure air is flowing from all nozzles in the forward cargo compartment.
(b)
Ensure air is not flowing from any nozzles in the aft cargo compartment.
(3)
Remove pressure source from discharge tube.
(4)
Connect pressure source to cargo fire bottle aft discharge tube.
(a) Ensure air is flowing from all nozzles in the aft cargo compartment.
(5)
Remove pressure source from discharge tube.
(6)
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 the tube assembly attaches to the discharge head.
(b)
Connect tube assembly to discharge head.
NOTE: Yellow indicates the plumbing that supplies halon to the forward cargo compartment. Blue indicates the 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).
G. Return Airplane to its Normal Condition
(1)
If removed, install air conditioning duct in front of 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.
5. Discharge Tube Pressure Test (Fig. 502)
A. General
(1)
The discharge tube pressure test should be performed every time a cargo fire bottle is removed from the discharge tube.
(2)
The pressure test is the same for the FWD or AFT cargo compartment.
B. Equipment
(1)
Source - Air Pressure, capable of supplying 50-55 psig.
(2)
B26002-1 - Test Equipment - Discharge Lines, Cargo Fire Extinguisher The Boeing Co. 81205 7755 E. Marginal Way
P.O. Box 3707
Seattle, WA 98124
C. Consumables
(1) C00913 Compound, Non-drying Resin Mix Corrosion-Inhibiting Material - BMS3-27
550
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-25-0 Page 507
D. Access
(1)
Location Zones
(a)
213 Forward Cargo Compartment
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