(b)  
Push the ECS MSG switch, on the EICAS MAINT panel, on the right side panel P61.

 (c)  
On the EICAS ECS display page, on the pilot's center instrument panel P2, make sure the L and R PACK OUT indications change.

 S 862-005
 (5)  
Stop the pack operation.

 (a)  
Turn the L and R PACK selectors, on the P5 panel, to the OFF position.

 (b)  
Make sure the PACK OFF lights come on.

 (c)  
Remove the pneumatic power, if it is not necessary (AMM 36-00-00/201).

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757 MAINTENANCE MANUAL
 (d)  Remove the electrical power, if it is not necessary (AMM 24-22-00/201).
 TASK 21-00-00-862-004
 3.  Ground Cart Conditioned Air Supply__________________________________
 A. General
 CAUTION: DO NOT OPERATE A COOLING PACK AND A GROUND AIR SOURCE AT THE
_______ SAME TIME. THE COOLING PACK CAN NOT CONTROL THE AIR TEMPERATURE IF A GROUND AIR SOURCE IS OPERATED AT THE SAME TIME. YOU CAN CAUSE DAMAGE TO EQUIPMENT IF YOU OPERATE A COOLING PACK AND A GROUND AIR SOURCE AT THE SAME TIME.
 (1)  
Obey this CAUTION during all of this task.

 B.
Access

 (1)  
Location Zone
 135 Environmental control system bay (Left)

 (2)  
Access Panel 193DL Environmental control system access door (Left)

 C.
Supply the conditioned air with a ground cart

 S 862-015
 (1)  If applicable, shut the packs off.
 NOTE: If the packs are operated in AUTO when the external
____ conditioned air is used, the cabin temperatures will increase instead of decrease. The temperature sensors in the mix manifold feel the cold air from the ground cart. This causes the packs to increase their exit temperature.
 S 012-006
 (2)  
Open the ECS access panel, 193DL (AMM 06-41-00/201) to find the ground connector for the conditioned air.

 (3)  
Open the cover of the ground connector.

 S 492-008

 (4)  
Connect the ground cart to the ground connector.

 (a)  
Put the flange of the cart supply hose into position against the flange of the ground connector.

 (b)  
Make sure the fasteners on the supply hose flange go into the slots of the ground connector flange.

 (c)  
Turn the supply hose flange so that it locks into position.

 S 012-007
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MAINTENANCE MANUAL

 CAUTION: MAKE SURE THAT THE SUPPLY HOSE FLANGE IS CORRECTLY LOCKED
_______ INTO POSITION. IF THE SUPPLY HOSE FLANGE IS NOT IN THE CORRECT POSITION WHEN THE AIR FLOW STARTS, IT CAN CAUSE DAMAGE TO THE GROUND CONNECTOR FLANGE.
 (d)  Make sure that the supply hose flange is correctly locked into position.
 S 862-009
 (5)  
Turn the ground cart on, to supply the conditioned air to the airplane.

 D.
Remove the conditioned air supplied by the ground cart

 S 862-010
 (1)  
Stop the ground cart operation, to stop the supply of conditioned air.

 S 082-011

 (2)  
Disconnect the ground cart from the ground connector.

 (a)  
Turn the flange of the cart supply hose to loosen the fasteners.

 (b)  
Remove the supply hose from the ground connector.

 E.
Put the airplane back to its usual condition.

 S 412-012
 (1)  
Close the cover of the ground connector.

 (2)  
Close the ECS access panel, 193DL (AMM 06-41-00/201).

 S 412-013
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