S 213-062

 (7)  
Examine the port. If the inside of the port shows signs of contamination, replace the fitting (AMM 35-21-09/401).

 S 163-063
 CAUTION: NEVER LET THE HOSE END FITTING TOUCH THE GROUND OR A SURFACE
_______ THAT IS NOT CLEAN. CONTAMINATION IN THE SYSTEM CAN CAUSE A FIRE OR AN EXPLOSION.
 (8)  Before you move the supply hose to the airplane, do these steps:
 (a)  
Remove the protective cover from the supply hose adapter.

 (b)  
Examine the adapter to make sure it is clean.

 (c)  
Set the pressure reducing valve at a nominal outlet pressure of 100 to 150 psig.

 (d)  
Slowly open the shutoff valve to blow the contamination from the supply hose and adapter.

 (e)  
Close the supply cart shutoff valve.

 (f)  
Put the cover back on the supply hose adapter.

 S 493-070
 WARNING:_______DO NOT USE LUBRICANTS OR GASKETS IN THESE CONNECTIONS. THESE MATERIALS COULD BE A SOURCE OF IGNITION. IF YOU USE LUBRICANTS, TOO MUCH TORQUE COULD BE ACCIDENTALLY APPLIED TO THE FITTINGS, AND CAUSE DAMAGE TO THE EQUIPMENT. IF YOU USE GASKETS, A LEAK COULD OCCUR.
 (9)  Connect the supply hose adapter to the fill fitting port.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757
MAINTENANCE MANUAL

 S 863-072
 (10)
 Find the correct pressure for the passenger oxygen system.  Set the pressure dial to this pressure.

 S 863-074

 (11)
 Find the temperature of the passenger oxygen cylinders area.  Set the fill fitting temperature selector to this temperature.

 S 863-075

 (12)
 Adjust the pressure reducing valve of the ground servicing equipment to permit more than 150 psi of outlet pressure.

 S 613-076
 WARNING:_______OPEN THE VALVES SLOWLY. IF YOU OPEN THE VALVES QUICKLY, THE OXYGEN CAN GET TOO HOT. IF THE OXYGEN GETS TOO HOT, A FIRE OR AN EXPLOSION COULD OCCUR.
 (13)
 Slowly open the shutoff valve on the supply cart to full open. Make sure there are no leaks.

 S 613-077

 (14)
 Very slowly adjust the pressure reducing valve to increase the outlet pressure to a value equal to the airplane indicator pressure.

 S 613-078
 CAUTION: DO NOT LET THE CYLINDER PRESSURE BECOME MORE THAN 2300 PSI.
_______ TOO MUCH PRESSURE COULD CAUSE AN EXPLOSION.
 (15)
 Gradually change the pressure reducing valve until the outlet pressure is kept at 200 to 250 psi (1379 to 1724 kPa) above the lowest system presure, until the automatic shutoff occurs.

 S 613-079

 (16)
 After the automatic shutoff occurs at the necessary pressure, and the flow has stopped, close the shutoff valve on the supply cart. Reset the pressure reducing valve to zero.

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757 MAINTENANCE MANUAL
 S 033-080
 WARNING: BE CAREFUL WHEN YOU DISCONNECT THE HOSE FROM THE SUPPLY CART.
_______ THE REMAINING PRESSURE IN THE HOSE CAN CAUSE INJURY OR DAMAGE.
 CAUTION: NEVER LET THE HOSE END FITTING TOUCH THE GROUND OR
_______ A SURFACE THAT IS NOT CLEAN. CONTAMINATION IN THE SYSTEM CAN CAUSE A FIRE OR AN EXPLOSION.
 (17) When you are done with the servicing, do these steps to bleed the ground cart hose through the cart bleed hose:
 (a)  
Gradually loosen the supply hose adapter to release the remaining pressure.

 (b)  
Disconnect the supply hose from the filler port on the servicing panel.

 (c)  
Install the protective cover on the supply hose adapter.

 (d)  
Put the supply hose in its stowage position.

 S 793-081
 (18)
 If you installed a supplemental pressure gage, do a leak check with the leak detection compound at the connections where the supplemental pressure gage was installed.
　
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