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757 MAINTENANCE MANUAL
 (c)  
Make sure the lower spacer is in the correct position to fit the contour of the airplane skin. 1) Make sure the holes are aligned.

 (d)  
Install and tighten the bolts and washers into the lower flange of the ground connector duct.

 (e)  
Fillet seal the edge of the lower flange gasket (Ref 51-31-01).

 1)  Install and tighten the bolts and washers to the top flange of the ground connector duct.

 (f)  
GUN 001-004 WITH SB 21-51 AND GUN 005-999; do the steps that follow: 1) Move the rubber sleeve of the bypass duct on to the joint

 with the ground connector duct. 2) Install the clamp on the ground connector duct.
 S 434-059
 (4)  
Install the mix manifold.

 (a)  
Attach the bottom section of the mix manifold to the ground service duct with a new gasket.

 (b)  
Install the top section of the mix manifold.

 (c)  
Attach the forward muffler to the top section of the mix manifold.

 (d)  
Install the filter housing.

 (e)  
Attach the filter duct to the bottom section of the mix manifold.

 F.  
Do the installation test for the check valve assembly

 S 014-058
 (1)  
Open the access door for the ground connector, 193DL
 (AMM 06-41-00/201).

 S 864-046

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 864-047

 (3)  
Supply pneumatic power (AMM 36-00-00/201).

 S 864-048

 (4)  
Remove the DO-NOT-OPERATE tags from the L and R PACK selectors, on the pilot's overhead panel P5.

 (a)  
Turn the selectors to the AUTO positions.

 (b)  
Make sure the PACK OFF lights go off.

 S 214-049
 (5)  
Feel for leaks in the check valve or the connector duct.

 (a)  
A small leak is permitted.

 (b)  
You must repair a large leak.

 S 864-050
 (6)  Turn the L and R PACK selectors, on the P5 panel, to the OFF position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 S 864-051
 (7)  
Remove the pneumatic power, if it is not necessary
 (AMM 36-00-00/201).

 S 214-052

 (8)  
From the out side the airplane, make sure the check valve opens a little.

 G.
Put the airplane back to its usual condition

 S 414-053
 (1)  
Install the aft bulkhead lining of the forward cargo compartment (AMM 25-50-03/401).

 S 414-054

 (2)  
Close the No. 1 cargo door, 821 (AMM 06-46-00/201).

 S 414-057

 (3)  
Close the access door for the ground connector, 193DL
 (AMM 06-41-00/201).

 S 864-055

 (4)  
Remove the electrical power, if it is not necessary
 (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 CONDITIONED AIR GROUND CONNECTOR - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  The ground connector is used to supply the conditioned air to the airplane without the use of the air conditioning packs. The connector lets a ground cart be attached directly to the mix manifold. This procedure has instructions to remove and install the connector.
 TASK 21-21-02-004-001
 2.  Remove the Conditioned Air Ground Connector (Fig. 401)___________________________________________
　
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