S 085-117
(17)
Disconnect the 0-30 psi pressure gauge and test hose from the tee fitting.
(18)
Disconnect the tee fitting from the test port.
(19)
Install the cap on the test port.
S 085-118
S 085-119
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35-21-00
ALL ú ú 01B Page 525 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 035-120
(20)
Slowly loosen the B-nut on the inlet port of the continuous flow control unit to bleed off any residual pressure in the supernumerary oxygen system.
S 435-121
(21)
Connect these electrical connectors to the continuous flow control unit (AMM 35-21-04/401):
(a) DM101 electrical connector from the M101 electropneumatic unit.
S 435-122
(22) Tighten the B-nut at the inlet port of the continuous flow control unit.
S 865-123
WARNING:_______OPEN THE SHUTOFF VALVES ON THE OXYGEN CYLINDER SLOWLY. HIGH TEMPERATURES CAN OCCUR WHICH CAN START AN IGNITION WITH THE OXYGEN. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT.
(23) Open all the shutoff valves on the oxygen cylinders:
(a) Slowly turn the shutoff valve until it is fully open.
NOTE: The shutoff valve can be closed by hand which is
____
equivalent to 25 pound-inches.
(b)
Close the shutoff valve one-fourth of a turn.
(c)
Install a lockwire on the shutoff valve.
NOTE: Use the 0.020 inch diameter copper lockwire
____
(AMM 20-11-28/401).
S 865-124
(24) Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) P7 Overhead Circuit Breaker Panel
1) 7D4 OXYGEN VALVE & IND
S 795-125
(25) Do a check of the high pressure line to the flow control unit for leaks with the leak detection compound at the B-nut connection.
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35-21-00
ALL ú ú 01B Page 526 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 795-126
(26) Make sure that there are no bubbles detected to indicate a leak.
(a) If there is a leak detected, it must be repaired.
S 165-127
(27)
Immediately rub off the leak detection compound with a clean cotton cloth when done.
S 415-128
(28)
Close all the access panels to the supernumerary oxygen cylinders.
TASK 35-21-00-715-129
7. Simulated Automatic Actuation and Alternate (Electrical) Actuation Test_______________________________________________________________________
A. Standard Tools and Equipment
(1)
Barometer (to determine atmospheric pressure in inches of Hg)
(2)
Caps and Plugs - Package of Clean, Protective
(3)
Cylinder - Portable Test, 0-2000 psi (if applicable)
(4)
Cart - Oxygen Bottle (oxygen quality air) or Cylinder - Portable Test, Scott Aviation, 225 Erie Street, Lancaster
N.Y. (if applicable)
(5)
Gauge - Pressure, 0-150 psi
(6)
Gauge - Pressure, 0-2000 psi with an accuracy of | 2-1/2% graduations. The graduations must not be more that 100 psi apart, and a diameter of not less than 4 inches
(7)
Rod - Metal, 1/4-inch diameter
(8)
Source - Variable Vacuum, capable of maintaining 25-inch Hg vacuum with minimum flow of 1 cfm
(9)
Flexible Hose
B. Consumable Materials
(1)
G00000 Air - Clean, Dry with no particles or fibers larger than 100 microns in the longest dimension per cubic foot of air. It must not have no more than 3 PPM total hydrocarbon by weight or 7 PPM by volume. The moisture content can not exceed 0.00002 grams per liter of air at 70°F and 760 MM mercury. This is equivalent to a dew point of -63.6°F at 760 MM mercury. This air is to be used with portable test cylinder.
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