APU/CARGO Fire Control Panel, P8, goes off.
E. AIRPLANES WITH NON-METERED CARGO FIRE EXTINGUISHING SYSTEM; Test Aft Discharge Line
S 025-301
(1)
Disconnect the AFT discharge hoses on the AFT discharge ports of bottle 1 and bottle 2.
(2)
Connect the dry air source to the AFT discharge hose of bottle 1.
S 485-302
S 785-503
CAUTION:_______APPLY PRESSURE ONLY TO TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
(3)
Start the dry air source and apply pressure between 100 psig minimum and 120 psig maximum to the aft cargo compartment.
(a) Make sure that air flows freely from the AFT discharge hose of bottle 2.
(4)
Stop the dry air source.
S 865-305
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S 435-306
(5) Cap the AFT discharge hose of bottle 2 with a suitable cap.
S 785-416
CAUTION:_______APPLY PRESSURE ONLY TO THE TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO THE DISCHARGE PORTS CAN OCCUR.
(6) Start the dry air source and apply pressure between 100 psig minimum and 120 psig maximum to the aft cargo compartment.
(a)
Make sure that air flows freely from all four distribution nozzles in the center of the aft cargo compartment ceiling.
(b)
Make sure that no air flows from the three distribution nozzles in the center of the forward cargo compartment ceiling.
S 865-257
(7)
Stop the dry air source.
S 425-399
(8)
Install the nozzle caps to the distribution nozzles in the AFT cargo compartment ceiling.
S 785-400
(9)
Apply pressure of 50 +/- 5 psig to the tubing.
S 865-401
(10)
Stop the pressurization, and observe the pressure decay for ten minutes.
S 785-402
(11)
Make sure the pressure has not decreased by more than 0.5 psig.
S 785-403
(12)
Release the pressure from the AFT cargo compartment tubing.
S 035-404
(13)
Remove the nozzle caps from the distribution nozzles in the AFT cargo compartment.
(14)
Disconnect dry air source from the AFT discharge hose of bottle 1.
(15)
Remove the cap from the bottle 2 discharge hose.
S 425-311
(16)
Connect the AFT discharge hoses to the AFT discharge ports of bottles 1 and 2.
S 085-309
S 035-310
(a) Tighten the discharge hoses to 280 pound-inches for 1/2-inch connectors and 360 pound-inches for 5/8-inch connectors.
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F. AIRPLANES WITH METERED CARGO FIRE EXTINGUISHING SYSTEM; Test the aft metered discharge line.
S 865-374
(1) Open both the Forward and Aft Cargo Compartment Doors.
(a) Leave both the doors open for this part of the test.
S 025-375
(2) Disconnect the AFT discharge hoses on the AFT discharge ports of bottle 1 and bottle 2.
S 865-379
WARNING: DO NOT LET THE NITROGEN FLOW INTO THE AFT CARGO COMPARTMENT ANY
_______ LONGER THAN REQUIRED TO COMPLETE THE TEST. A CONTINUOUS FLOW OF NITROGEN MAY DECREASE THE OXYGEN IN THE CARGO COMPARTMENT. INJURY TO PERSONS MAY OCCUR.
(3) Connect the dry nitrogen source to the AFT discharge hose of bottle
2.
S 785-628
CAUTION:_______APPLY PRESSURE ONLY TO TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
(4)
Start the dry nitrogen source and apply pressure between 100 psig minimum and 120 psig maximum to the aft cargo compartment.
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