(2)
Install hinge bolts.
(3)
Deleted.
G. Test Valve
(1)
Position spring scale against outside of valve door.
(2)
Check that 4 to 8 pounds is required to crack door open.
(3)
Open door to full open. Door must open smoothly.
(4)
Check that 8 to 10.5 pounds is required to hold door full open (80 degrees).
H. Install cargo compartment aft bulkhead panel.
500
Oct 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-32-11 Page 401
Pressure and Relief Valve Installation 500
21-32-11Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/76
SAFETY RELIEF VALVE - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Parting Agent - Fluorocarbon MS122 (Ref 20-30-51)
2. Remove Safety Relief Valve (Fig. 401)
A. Gain access to safety relief valves by removing right panel of aft cargo compartment aft bulkhead.
B. Loosen clamp around base of valve being removed and slip clamp down onto pedestal.
C. Remove safety relief valve and gasket.
3. Install Safety Relief Valve (Fig. 401)
A. Apply parting agent to both sides of gasket and position gasket on pedestal.
CAUTION: MAKE SURE AMBIENT SENSE PASSAGE IS NOT BLOCKED BY GASKET. BLOCKING THE PASSAGE WILL PREVENT VALVE OPERATION.
B. Check sensing passage through pedestal and into relief valve for any loose dirt or other obstruction and position valve on pedestal.
CAUTION: USE CARE IN POSITIONING VALVE ON PEDESTAL TO AVOID DAMAGE TO SENSING TUBE.
C. Position clamp around top of pedestal and base of valve and tighten clamp bolt.
D. Test safety relief valve (Ref Adjustment/Test).
NOTE: The Adjustment/Test procedure may be omitted if a new or overhauled valve is installed.
E. Install panel in rear wall of aft cargo compartment.
501
Jun 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-32-21 Page 401
Safety Relief Valve Installation 500
21-32-21 Figure 401 Aug 15/73
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SAFETY RELIEF VALVE - ADJUSTMENT/TEST
1. Safety Relief Valve Test
A. General
(1)
Ground testing of the safety relief valve consists of reducing pressure at the valve sensing port to simulate low ambient pressure.
(2)
The test may be performed using either of two test fixtures. Both methods are covered in this procedure.
2. Test Safety Relief Valve Using Hamilton Standard Test Fixture
A. Equipment and Materials
(1)
Valve Test Fixture - GS15047, Hamilton Standard
(2)
Air source
B. Test Safety Relief Valve
(1)
Set pressure regulator on valve test fixture so that pressure regulator valve is closed.
(2)
Connect air source to pressure regulator on valve test fixture.
(3)
Position valve test fixture over safety relief valve on fuselage with test fixture locating crossbar forward of safety relief valve deflector tube. Hold fixture in position until vacuum is initiated.
NOTE: Valve test fixture is positioned as far forward as possible to ensure that safety relief valve ambient sense port is clear of test fixture gasket.
(4)
Turn air pressure regulator on valve test fixture to start flow of air.
(5)
Monitor vacuum gage on valve test fixture and adjust air pressure regulator so that vacuum increases 4.5 in. Hg/min near relief point. Support valve test fixture to prevent it from dropping when safety relief valve opens (between 16.8 and 17.8 in. Hg).
CAUTION: FAILURE TO SUPPORT FIXTURE WILL ALLOW FIXTURE TO DROP FROM FUSELAGE AT VALVE OPENING POINT AND CAUSE DAMAGE. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737 AMM 飞机维护手册 AIR CONDITIONING 空调(59)
