(a)  
452ER, 452FL, and 452GR

 (b)  
462FL and 462HL

 (c)  
472FL and 472HL

 (d)  
482ER, 482FL, and 482GR.

 TASK 36-11-00-706-151
 4. APU Pneumatic Duct Audible Leakage Check
________________________________________
 A. General
 (1)  This procedure examines the general condition and duct joint leakage of pneumatic ducts between the APU and APU check valve. Access to the ducts are required to do the audible and visual inspections. A ground air source is required to do the audible leakage check.
 B. Special Tools and Equipment
 (1)  
Part Number: TE65B98600 Quantity: 1 Purpose: The block-out plate is to prevent the backflow of air to

 the APU.

 (2)  
Part Number: 2TE65B07917 Quantity: 1 Purpose: The duct section is to replace the APU check valve.

 (3)  
Ground air source that can provide clean air at a regulated pressure of 70 pounds/min and 45 psig. Connection must mate with a 3-inch diameter pneumatic ground service fitting.

 C. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (3)  
AMM 36-00-00/201, Pneumatic System

 (4)  
AMM 52-34-00/001, Forward/Aft Cargo Compartment Door

 D. Access
 (1)  
Location Zone
 141 Aft Cargo Container Compartment, Left
 145 Bulk Cargo Compartment, Left
 313/314 Stabilizer Torsion Box Compartment
 315/316 Area Aft of Stabilizer Box Compartment

 (2)  
Access Panel 822R Door - Aft Cargo Compartment 312AR Door - Access Door - Jackscrew Horizontal Stabilizer 315AL Door - Access Door

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A
747-400 MAINTENANCE MANUAL
 E. Procedure
 S 866-056
 (1)  
Supply the electrical power (AMM 24-22-00/201).

 S 866-049

 (2)  
Put these switches on the P5 overhead panel to the closed position:

 (a)  
L ISLN VALVE

 (b)  
R ISLN VALVE

 S 866-161
 (3)
Put the PACK 2 switch (P5 overhead panel) to the OFF position:

 S 866-057

 (4)  
Put the STAB TRIM 2 and 3 switches to the CUTOFF position.

 S 866-182

 (5)  
Open these circuit breakers on the P7 overhead circuit breaker panel and attach DO-NOT-CLOSE tags:

 (a)  
7E7 L STAB TRIM S/O VLV

 (b)  
7E20 R STAB TRIM S/O VLV

 S 036-153
 (6)  
Remove the APU check valve (AMM 36-11-08/401).

 S 486-154

 (7)  
Install the 2TE65B07917 duct section.

 S 016-173

 (8)  
Open the 315AR jackscrew horizontal stabilizer access door (AMM 06-09-05/201).

 S 016-051

 (9)  
Open the 315AL access door (AMM 06-09-05/201).

 S 486-152

 (10)
 Remove the first coupling forward of the APU firewall from the APU duct.

 S 486-155
 WARNING: MAKE SURE THE BLOCK-OFF PLATE IS INSTALLED CORRECTLY AND MAKE
_______ SURE THAT THE DUCT SECTION CANNOT MOVE WHEN YOU PRESSURIZE IT. IF THE DUCT SECTION CAN MOVE WHEN IT IS PRESSURIZED, IT CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (11)
 Install the TE65B98600 block-off plate on the forward end of the duct joint.

 (12)
 Open the aft cargo door (AMM 52-34-00/001).

 S 016-052
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747-400 MAINTENANCE MANUAL
 S 016-053
 (13)
 Remove the sidewall linings to get access to the pneumatic ducts (AMM 25-52-01/401).
　
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