(b)
Make sure the flow control valve closes.
(c)
Make sure the VALVE CLOSED light, on the tester, comes on.
(d)
Turn the 0-30 psi pressure regulator knob until the 0-30 psi gage reads 0.
(e)
Make sure the flow control valve opens.
(f)
Make sure the VALVE CLOSED light, on the tester, goes off.
S 725-016
(3) Do the Test for the Shutoff Solenoid Operation
(a)
Close the SW 1 switch, on the tester.
(b)
Make sure the flow control valve closes.
(c)
Make sure the VALVE CLOSED light, on the tester, comes on.
(d)
Open the SW 1 switch, on the tester.
(e)
Make sure the flow control valve opens.
(f)
Make sure the VALVE CLOSED light, on the tester, goes off.
S 725-017
(4) Do the Test for the Minimum Pressure Control
(a) Turn the 0-100 psi pressure regulator knob until the 0-100 psi pressure gage reads 8 psi.
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747-400 MAINTENANCE MANUAL
(b)
Make sure the flow control valve closes.
(c)
Make sure the VALVE CLOSED light, on the tester, comes on.
(d)
Turn the 0-100 psi pressure regulator knob until the 0-100 psi pressure gage reads 0.
S 725-018
(5) Do the Test for the Normal Flow Solenoid.
(a)
Turn the 0-30 psi pressure regulator knob until the 0-30 psi gage reads 20 psi.
(b)
Feel for air at the two exhaust ports of the schedule change housing of the flow control valve.
(c)
Close the SW 2 switch, on the tester.
(d)
Make sure you can not feel air at the two exhaust ports of the schedule change housing of the flow control valve.
(e)
Open the SW 2 switch, on the tester.
(f)
Feel for air at the two exhaust ports of the schedule change housing of the flow control valve.
(g)
Turn the 0-30 psi pressure regulator knob until the 0-30 psi gage reads 0.
F. Put the airplane to its usual condition
S 865-019
(1) Open the applicable circuit breakers, on the P180 panel:
(a)
180J1, PACK 1 FLOW CONT VLV
(b)
180J2, PACK 1 PROT
(c)
180F1, PACK 2 FLOW CONT VLV
(d)
180F2, PACK 2 PROT
(e)
180J16, PACK 3 FLOW CONT VLV
(f)
180J17, PACK 3 PROT
S 085-030
(2) Disconnect the test equipment.
(a)
Disconnect the test cable(s) and the hose assemblies from the valve.
(b)
Remove the test plugs from the valve test ports, G1 and G2.
(c)
Install the filter and the plug at the valve test port G1.
(d)
Install the plug at the valve test port G2.
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(e) (f) (g) (h) Install a lockwire on the plug in the valve test port G2 (AMM 20-11-28/401).Connect the electrical connector to the valve.Disconnect the cable and the hose assemblies from the tester.Disconnect the air or the nitrogen supply from the tester.
S 865-023
(3) Close the applicable circuit breakers, on the P180 panel: (a) 180J1, PACK 1 FLOW CONT VLV (b) 180J2, PACK 1 PROT (c) 180F1, PACK 2 FLOW CONT VLV (d) 180F2, PACK 2 PROT (e) 180J16, PACK 3 FLOW CONT VLV (f) 180J17, PACK 3 PROT
S 415-024
(4) Close the applicable access doors, 191H-L, 191N-L, 192H-R (AMM 06-09-03/201).
S 865-025
(5) Remove the electrical power, if it is not necessary (AMM 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中國(guó)航空網(wǎng) www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 空調(diào) AIR CONDITIONING 2(9)
