(e)
Remove the applied vacuum and make sure that UPR PRESS RELIEF or LWR PRESS RELIEF message goes off when the valve closes.
(f)
Push the PACK RST switch.
S 085-005
(3) Remove the hose assembly from the remote port adapter and from the discharge port adapter.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-32-01
ALL ú ú 04 Page 503 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 085-006
(4) Remove the remote port adapter from the skin and do the integral ambient test.
I. Integral Ambient Test
NOTE: If the valve does not open at the pressure specified for the
____ Integral Ambient Test, remove the valve (AMM 21-32-01/401) and calibrate (CMM 21-32-01).
S 215-007
(1) Examine the inner edge of the integral ambient sensing port tube for burrs.
(a) Deburr if it is necessary to prevent damage to the test fitting.
S 485-009
(2)
Install the integral sense port adapter into the integral ambient sensing port and lock it in its position.
S 485-010
(3)
Connect the integral sense port adapter hose assembly to the discharge port adapter (Figure 501, detail B).
S 725-011
(4)
Do the test.
(a)
Slowly decrease the system pressure at a rate of not more than
0.75 in. Hg/min until the valve opens.
(b)
Make sure the valve opens at a differential pressure of 9.65 +0.15/-0.15 psi (66.5 |1 kPa).
NOTE: After the valve opens, the differential pressure
____ decreases to less than 9.65 psi (66.5 kPa) and then starts to increase to open the valve again.
(c)
If the valve opens at more than 9.65 psi (66.5 kPa), make sure there are no loose fittings in the test equipment tubing.
(d)
With the valve in the open position, do these steps:
1) Make sure the applicable status message UPR PRESS RELIEF or LWR PRESS RELIEF shows on the lower EICAS screen after 5 seconds.
(e)
Remove the applied vacuum and make sure that the UPR PRESS RELIEF or LWR PRESS RELIEF message goes off when the valve closes.
(f)
Push the PACK RST switch.
S 085-012
(5) Remove all the test equipment and close the valve door.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-32-01
ALL ú ú 03 Page 504 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
TASK 21-32-01-705-042
3. Pressure Relief Valve Test with Boeing Test Equipment (Fig. 502)_____________________________________________________
A. General
_______
(1) This test is a calibration check of the positive pressure relief valves.
B. Special Tools and Equipment
(1) A21010-70, Vacuum Tank - Pressure Relief Valve Test, or equivalent
C. Standard Tools and Equipment
(1) Air compressor or air source - capable of 60-80 psi. at 22 scfm, commercially available
D. References
(1)
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
(2)
AIPC 21-32-00, Fig. 1
(3)
WDM 21-33-11
(4)
SSM 21-33-01
E. Access
(1) Location Zone 123 Forward Cargo Container Compartment Aft Half, LH
F. Prepare for the Test
S 865-025
(1) Make sure these circuit breakers are closed:
(a) P6 Main Power Distribution Panel:
1) 6F35, PACK TEMP CONT-A
2) 6F36, PACK TEMP CONT-B
3) 6J33, MISC ECS PCA
G. Do the Pressure Relief Valve Test
NOTE:____This test can only be done on one valve at a time. Do the test on the upper relief valve, then do the test again on the lower relief valve.
S 485-026
(1) Connect the test equipment to the applicable (upper or lower) relief valve (Fig. 502):
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 1(135)
