(2)
Access Panels
821 Forward Cargo Compartment Door
822 Aft Cargo Compartment Door
C. Prepare to clean the discharge lines.
S 867-004
(1)
Open the forward cargo door NO.1 and the aft cargo door NO.2
S 867-005
(2)
Get access to the fire extinguisher bottles which are located behind the forward bulkhead lining of the aft cargo compartment, (AMM 25-50-03/401).
S 867-006
(3)
Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags:
(a)
6H1, FIRE EXTINGUISHING ENG L BTL 1
(b)
6H5, FIRE EXTINGUISHING CARGO BTL 1
(c)
6H6, FIRE EXTINGUISHING CARGO BTL 2
D. Procedure.
S 167-012
(1) Do the steps that follow:
(a)
Remove the discharge tubing from bottle 1 and bottle 2 forward discharge heads.
(b)
Connect dry plant air source to bottle 1 forward discharge hose.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
(c)
Supply pressure between 45 psig and 55 psig to the bottle 1 discharge hose until it's free of unwanted materials.
(d)
Remove pressure from the bottle 1 discharge hose.
(e)
Seal bottle 2 forward discharge hose with a cap.
(f)
Remove all the forward cargo compartment nozzle outlets that are installed in the ceiling panel.
(g)
Make a visual inspection of the nozzle outlets for unwanted materials that are collected within the nozzle orifices.
(h)
Clean and make sure the nozzle is free of unwanted materials.
(i)
Supply pressure intermittently until the discharge lines are free of unwanted materials.
(j)
Remove pressure and disconnect the air source from the forward cargo compartment discharge hose.
(k)
Install the forward compartment nozzle outlets , seal and tighten to 360 inch-pounds per BAC 5001.
(l)
Connect the forward discharge hose to bottle 1 "FWD" discharge port, seal and tighten to 280 inch-pounds per BAC 5001.
(m)
Remove the cap from bottle 2 discharge hose.
(n)
Connect the hose to the "FWD" discharge port, seal and tighten to 280 inch-pounds per BAC 5001.
(o)
Push the reset button on the forward in line pressure switch (S633).
(p)
Remove the discharge tubing from bottle 1 and bottle 2 aft discharge heads.
(q)
Connect dry plant air source to bottle 1 aft discharge hose.
(r)
Supply pressure between 45 psig and 55 psig to the bottle 1 discharge hose until it's free of unwanted materials.
(s)
Remove pressure from the bottle 1 discharge hose.
(t)
Seal bottle 2 aft discharge hose with a cap.
(u)
Remove all the aft cargo compartment nozzle outlets that are installed in the ceiling panel.
(v)
Make a visual inspection of the nozzle outlets for unwanted materials that are collected within the nozzle orifices.
(w)
Clean and make sure the nozzle is free of unwanted materials.
(x)
Supply pressure intermittently until the discharge lines are free of unwanted materials.
(y)
Remove pressure and disconnect the dry air source from the aft cargo compartment discharge hose.
(z)
Install the aft compartment nozzle outlets , seal and tighten to 360 inch-pounds per BAC 5001. (aa) Connect the aft discharge hose to bottle 1 "AFT" discharge port.
(ab) Remove the cap from bottle 2 discharge hose and connect the hose to the bottle 2 "AFT" discharge port.
S 867-003
(2) Close these circuit breakers on the P6 panel and remove the DO-NOT-CLOSE tags:
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