(4)
Weigh and record the empty weight of the gas cylinder.
S 972-030
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A
747-400
MAINTENANCE MANUAL
NOT INSTALLED ON ALL AIRPLANES
Gas Reservoir Actuator Figure 202
K17181
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747-400 MAINTENANCE MANUAL
PORT FOR BOLT SAFETY
(LATER CONFIGURATION)
LEVER
VIEW PORT
COCKING ROD
PORT FOR BOLT SAFETY
(EARLY CONFIGURATION)
COCKING ARM WARNING: UNCOCKED POSITION.
STEP 1 STEP 2
LANYARD
(TYPICAL)
STOP PIN
BALL END
REMOVE ROD
WARNING: COCKED POSITION.
STEP 3 STEP 4
Cocking and Arming Regulator Valve
Figure 203
K17182
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747-400
MAINTENANCE MANUAL
PORT FOR BOLT SAFETY (EARLY CONFIGURATION)
STREAMER
NUT
BOLT SAFETY
COCKING ARM
EARLY CONFIGURATION
PORT FOR BOLT SAFETY (LATER CONFIGURATION)
STREAMER
NUT
BOLT SAFETY
COCKING ARM
LATER CONFIGURATION
Installing Bolt Safety
Figure 204
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K17185
A
747-400 MAINTENANCE MANUAL
S 612-067
WARNING:_______ HOLD THE CHARGE FITTING HOSE. USE A GUARD TO PREVENT INJURY OR
DAMAGE TO THE EQUIPMENT IF THE CHARGE FITTING HOSE BECOMES
UNSERVICEABLE.
CAUTION: EXAMINE THE GAS CYLINDER TO MAKE SURE THAT THE COMPONENTS ARE
_______ IN ALL OF THE WEIGHINGS TO GIVE THE TOTAL WEIGHT OF THE GAS.
(5) Connect a hose to the output side of the portable servicing unit and the inlet charge fitting on the gas cylinder. Balance the scale (Fig. 205).
NOTE: Keep the gas cylinder on the scale during the pressurization
____ of N2 to prevent more than the necessary quantity of gas.
S 612-032
(6)
Connect the N2 source to the input side of the portable servicing unit.
S 612-033
(7)
Open the charge fitting on the gas cylinder.
S 612-034
(8)
Turn on the air supply. Adjust the pressure to 145-155 psig.
S 612-035
(9)
Open the valve on the N2 storage cylinder. Adjust the pressure to 300-500 psig.
S 612-036
(10)
Continue pressurization until the weight of the gas cylinder has the weight of N2 at 9.38 - 9.42 pounds at 70 degrees F.
S 612-037
(11)
Close the air supply to the portable servicing unit.
S 612-038
(12)
Close the charge fitting on the gas cylinder.
S 422-039
(13)
Torque the nut to 120-130 inch pounds.
(14)
Disconnect the hose from the charge fitting.
(15)
Close the valve on the N2 storage cylinder.
S 482-040
S 612-041
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