CAUTION: NEVER ALLOW THE HOSE END FITTING TO CONTACT THE GROUND OR ANY OTHER UNCLEAN SURFACE.
(4)
Unlatch and open oxygen servicing panel door.
(5)
Check oxygen pressure indicator on servicing panel prior to filling.
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(a) Remove cylinder when a pressure reading of 50 psi or less is indicated and verify pressure with a supplemental gage, reading in 2-pound increments. Refer to paragraph 2 for cylinder replacement. 1) If pressure reading is less than 5 psi replace cylinder with fully serviced cylinder.
System is then considered serviced.
NOTE: Replaced oxygen cylinder should be sent to an authorized oxygen cylinder repair and overhaul facility to ensure that moisture has not entered oxygen cylinder.
2) If pressure reading is above 5 psi, reinstall cylinder for servicing.
D. Service Oxygen Cylinder
(1)
Check that crew oxygen system shutoff valve, located in control cabin, is closed.
(2)
Check that airplane crew oxygen cylinder shutoff valve is open.
(3)
Ensure that airplane oxygen servicing panel area is clean, then slowly unscrew pressure cap from airplane filler port (Fig. 201) and allow any trapped gas to bleed off before final disengagement of threads.
WARNING: FULL CYLINDER PRESSURE MAY EXIST INSIDE PRESSURE CAP. CAP MAY BE BLOWN OFF WITH SOME FORCE IF UNSCREWED TOO RAPIDLY TO ALLOW FOR VENTING OF TRAPPED GAS.
(4)
Examine filler port fitting to ensure that it is clean and free of oil, grease, etc.
(5)
Remove protective cover from ground servicing equipment supply hose adapter and connect adapter to airplane filler port.
WARNING: NO OIL, LUBRICANT, OR GASKETS SHALL BE USED IN MAKING THESE CONNECTIONS.
(6)
Determine pressure of airplane crew oxygen system and set filler valve pressure dial to this pressure.
(7)
Determine temperature of airplane crew oxygen cylinder area and set filler valve temperature knob to this temperature.
(8)
Ensure that ground servicing equipment pressure reducing valve has been adjusted not to exceed 150-psi outlet pressure.
(9)
Slowly open ground servicing equipment supply shutoff valve to full open. Ensure that there are no leaks.
(10)
Adjust ground servicing equipment pressure reducing valve to increase outlet pressure to a value equal to lowest airplane crew system pressure reading.
(11)
Gradually increase setting on ground servicing equipment pressure reducing valve in such a manner that outlet pressure gage never exceeds the airplane system crew pressure by more than 250 psi throughout filling.
(12)
After automatic shutoff occurs at desired pressure, and flow has ceased, close ground servicing equipment supply shutoff valve and reset ground servicing equipment pressure reducing valve to zero.
CAUTION: NEVER ALLOW AIRPLANE CYLINDER PRESSURE TO EXCEED 2300 PSI.
(13)
Gradually loosen supply hose adapter to bleed off residual pressure, then disconnect adapter from filler port. Install protective cover on adapter and stow hose.
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12-15-21 Page 208 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/85
WARNING: RESIDUAL PRESSURE MAY EXIST IN SUPPLY LINE AND ESCAPE WITH SOME FORCE.
CAUTION: NEVER ALLOW THE HOSE AND ADAPTER FITTING TO CONTACT THE GROUND OR ANY OTHER UNCLEAN SURFACE.
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Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 12-15-21 Page 209
(14)
Replace pressure cap on airplane servicing panel filler port and tighten to 100 (士5) pound-inches torque.
NOTE: A loose pressure cap on filler port could allow slow leakage to reduce amount of oxygen in crew cylinder.
(15)
Close and latch servicing panel door.
(16)
Slowly open crew oxygen system shutoff valve.
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12-15-21 Page 210 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/85
MAIN LANDING GEAR SHOCK STRUT - SERVICING
1. General
A. Procedures are provided for bottom servicing with or without jacking of airplane to cover different positions and conditions of the main landing gear shock strut at time of servicing. The appropriate procedure must be used for each given set of circumstances. Servicing of a shock strut after repair will always require jacking of airplane.
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