(h)  
Wind and tighten the cable or chain of the fishpole hoist a sufficient amount to take the weight off of the APU ground support lug.

 S 024-023
 (2)  
Remove the upper fire detector element or assembly. To remove it, do this task: Remove APU Fire Detector Element or Remove APU Fire Detector Assembly (AMM 26-15-02/401).

 S 024-007

 (3)  
Do these steps to remove the vertical support tube (5):

 (a)  
Remove the two nuts (3), four washers (2), two bolts (1) and two bushings (4) that attach the vertical support tube (5) to the aft shockmount.

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747-400 MAINTENANCE MANUAL
 (b)  
Remove the nut (8), washer (7) and bolt (6) that attach the vertical support tube (5) to the airplane structure.

 (c)  
Remove the vertical support tube (5).

 (d)  
Make sure you install all necessary protection covers.

 TASK 49-13-04-404-010
 3.  Vertical Support Tube Installation (Fig. 401, Fig. 402)__________________________________
 A. References
 (1)  
AMM 26-15-02/401, APU Fire Detector

 B.
Equipment

 (1)  
PF51-002-1 Hoist - Fishpole, Manual Powered
 06714 P. F. Industries Inc.
 151 S. Michigan St., Seattle, WA 98108-3225 or

 (2)  
AP6108 Hoist - Fishpole, Advanced Chain-Driven
 Morgan Aero Products
 2719 Pacific Avenue, Everett, WA 98201

 (3)  
2OHME65B00780-1 Sling - APU Rear Mount

 C.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 402 | 5 | Truss Assembly (Vertical Support | 49-13-51 | 01 | 235 | | | | Tube) | | | | 2.......….......…...................................…...........…......….......1

 D.
Access

 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 E.
Procedure

 S 424-008
 (1)  
Do these steps to install the vertical support tube (5):

 (a)  
Install the vertical support tube (5) to the airplane structure with the washer (7), bolt (6) and nut (8).

 (b)  
Install the vertical support tube (5) to the aft shockmount with the two bushings (4), four washers (2), two bolts (1) and two nuts (3).

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 (c)  Tighten the three bolts (1), (6) to 50-70 inch-pounds (5.7-7.9 newton-meters).
 S 424-021
 (2)  
Install the upper fire detector element or assembly. To install it, do this task: Install APU Fire Detector Element or Install APU Fire Detector Assembly (AMM 26-15-02/401).

 S 084-022

 (3)  
Remove the fishpole hoist and APU rear mount sling from the APU compartment.

 F.
Put the Airplane Back to Its Usual Condition

 S 864-017
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 S 864-018
 (2)  
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.
　
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