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 1.  General_______
 A.  This procedure contains two task. The first task does an inspection of the cable restraint for the APU pneumatic duct. The second task does an inspection of the titanium ducts which are touched by the fire-resistant hydraulic fluid.
 TASK 36-11-01-206-021
 2.  Inspect the APU Pneumatic Duct Restraint (Fig. 601)________________________________________
 A.  General
 (1)  
Inspection of the cable restraint installation for the APU pneumatic duct is necessary to eliminate the possibility for the development of a jammed elevator control system and bent elevator control rods in the event of an APU pneumatic duct rupture.

 (2)  
On airplanes without the APU pneumatic duct restraint installation, refer to SB 747-36A2087 for the applicable installation procedures.

 (a)  
Incorporation of service bulletin would involve the addition of two brackets on the forward side of the APU firewall, addition of a clamp assembly to APU pneumatic duct, and connection of two cables from the clamp assembly to the two brackets on the APU firewall.

 (b)  
Federal Aviation Administration (FAA) Airworthiness Directive AD 92-04-05, Amendment 39-8176, is related to this service bulletin.

 B.  
References

 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

 C.  
Access

 (1)  
Location Zone 315/316 Area Aft of Stabilizer Box Compartment

 (2)  
Access Panel
 315AL Door - Access Door

 D.  
Procedure

 (1)  
Open the 315AL access door (AMM 06-09-05/201).

 (2)  
Get access to the APU pneumatic duct installation.

 S 216-024

 (3)  
Check the overall general condition of the APU pneumatic duct restraint system.

 S 016-022
 S 216-023
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NOTE: TRUSS ASSEMBLIES NOT SHOWN FOR CLARITY

APU Pneumatic Duct Restraint Inspection
Figure 601 (Sheet 1)

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APU PNEUMATIC DUCT

A-A

APU Pneumatic Duct Restraint Inspection

Figure 601 (Sheet 2)

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 S 216-027
 (4)  
Check the vertical and horizontal restraint cable for signs of unacceptable wear or damage.

 (a)  
Replace the restraint cable, if there are unacceptable wear or damage found. 1) Install new restraint cable loosely on the pneumatic duct. 2) Install the necessary hardware accessories to connect cable

 assembly to the cable restraint brackets.

 (b)  
Adjust the position of the restraint on the duct and make sure there is no load on the duct that is caused by the cable assemblies.

 (c)  
Adjust the slack in the cables as evenly as possible. 1) The upper cable should not contact the horizontal section of the duct when the cable is in the free static position.

 2)  The restraint assembly can be rotated to maximize the clearance between the upper cable and the horizontal section of the duct.

 (d)  
Torque the T-bolt for the duct restraint clamp assembly to not more than 20 pound-inch.

 E.  Put the Airplane To Its Usual Condition
 S 416-025
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 氣動系統(tǒng) PNEUMATIC SYSTEM(68)