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(b)  Close the shroud latches.
 S 414-009
 (3)  Close the APU cowl door:
 (a)  
Disconnect the door support rods.

 (b)  
Put the door support rods in the clips on the APU cowl door.

 (c)  
Close the APU cowl door.

 (d)  
Close the latches on the APU cowl door.

 S 864-010
 (4)  Set the circuit breaker and the switch:
 (a)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit

 (b)  
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.

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APU MOUNTS - DESCRIPTION AND OPERATION
______________________________________
 1.  General (Fig. 1)
_______
 A.  The APU mounts hold the APU engine and isolate the airplane from all bad vibrations of the APU engine. The APU mounts have the shroud mounts, shroud rings, and APU engine mounts. The shroud mounts attach the shroud rings to the airplane structure. The APU engine mounts attach the APU engine to the shroud rings.
 2.  Shroud Mounts (Fig. 1)
_____________
 A.  The shroud mounts attach the shroud rings to the airplane structure. The shroud mounts have the airplane mounting brackets and the struts for the ring mounts. Each shroud ring is held vertically by two struts and laterally by one strut. Also, the aft shroud ring is held axially by two struts. The struts for the ring mounts are attached to the airplane mounting brackets and the ring mounts with bolts and nuts.
 3.  Shroud Rings (Fig. 1)
____________
 A.  Two shroud rings supply the installation base for the upper shroud and the APU engine mounts. The shroud rings have the ring mounts. The shroud mounts are connected to the shroud rings at the ring mounts. To make the installation easy, the shroud rings are part of the upper shroud.
 4.  APU Engine Mounts (Fig. 1)
_________________
 A.  The APU engine mounts attach the APU engine to the shroud rings. There are three APU engine mounts. Two of the APU engine mounts are found on the right side of the APU engine. One of the APU engine mounts is found on the left side of the APU. The APU engine mounts give the APU maximum support in all directions. Each of the APU engine mounts has two mounting brackets, a vibration isolator and a cap. The mounting brackets that attach to the shroud have the vibration isolators. The mounting brackets that attach to the APU engine flanges have the caps. The caps make the removal of the APU and the installation of the APU quick and easy.
 B.  The vibration isolators do not permit the vibrations from the APU engine to transmitted to the airplane structure. A vibration isolator has a resilient material that is bonded to a metal core. This material is in a tubular metal case. The vibration isolator is found between the mounting bracket on the APU engine and the mounting bracket on the shroud. As the APU engine shakes, the resilient material absorbs the vibrations.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
APU COMPARTMENTAIRPLANE STRUCTURE
MOUNTING AIRPLANE BRACKET MOUNTING BRACKET
RING MOUNT STRUTRING MOUNT STRUT (VERTICAL)(AXIAL) AIRPLANE MOUNTING BRACKET
RING MOUNT SHROUD RING
RING MOUNT STRUT MOUNTING BRACKETS
(LATERAL) FOR THE APU ENGINE MOUNT
CAPENGINE
FLANGE VIBRATION ISOLATOR
RIGHT AFT MOUNT
SEE A
A
APU COMPARTMENT STRUCTURE
AIRPLANE MOUNTING BRACKET
RING MOUNT STRUT
SEE C
(VERTICAL) UPPER SHROUD RING MOUNT SEE D
SHROUD RING AIRPLANE MOUNTING BRACKETSEE B
　
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