S 496-156

 (14)
 Connect the air source to one of the ground service pneumatic connections.

 S 866-054

 (15)
 Manually put the APU bleed air shutoff valve in the open position.

 S 866-157

 (16)
 Pressurize the pneumatic system to 40-44 psig (AMM 36-00-00/201).

 S 796-158

 (17)
 Examine the APU isolation valve and all of the ducts and couplings aft of the 2TE65B07917 duct section for leakage.

 NOTE: A small quantity of leakage is permitted from the
____ joints. There must not be a high concentration of leakage from the joints. A high concentration of air flow can be felt by the hand at a distance of 12 inches from the leakage source.
 (a)  
Diffused leakage is permitted.

 (b)  
Concentration leakage must be repaired.

 S 216-060
 (18)
 Examine the general condition of the ducting for problems.

 (a)  
Make the necessary repair to the problems that you find.

 S 866-062
 (19) Remove the pressure from the pneumatic system when the inspection is completed (AMM 36-00-00/201).
 F. Put the Airplane Back to Its Usual Condition
 S 036-061
 (1)  
Disconnect the air source from the ground service pneumatic
 connection.

 (2)  
Remove the 2TE65B07917 duct section.

 (3)  
Install the APU check valve (AMM 36-11-08/401).

 (4)
Remove the TE65B98600 block-off plate from the APU pneumatic duct.

 S 086-159
 S 436-059
 S 086-046
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747-400 MAINTENANCE MANUAL
 (5)  S 436-047Install the seal between the duct flanges.
 (6)  S 436-054Install the coupling on the duct flanges.
 (7)  S 436-055Tighten the coupling to 65-85 pound-inches (7-9 N.m).
 (8)  S 216-051Make sure that there are no leakage created from the installation of the APU check valve and couplings.
 (9)  S 416-057Close the 315AL access door (AMM 06-09-05/201).
 S 416-058

 (10)
 Close the 312AR jackscrew horizontal stabilizer access door (AMM 06-09-05/201).

 S 416-045

 (11)
 Install the sidewall linings removed at the aft cargo compartment (AMM 25-52-01/401).

 S 416-046

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

 S 866-183

 (13)
 Put the STAB TRIM 2 and 3 switches to the AUTO position.

 S 866-184

 (14)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P7 overhead circuit breaker panel:

 (a)
7E7 L STAB TRIM S/O VLV

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 (b) 7E20 R STAB TRIM S/O VLV
 S 866-047
 (15) Remove the electrical power if it is no longer necessary for other operations (AMM 24-22-00/201).
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 PNEUMATIC DUCT - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure contains the tasks to remove and install the duct sections of the engine bleed air supply system.
 B.  Thin wall ducts may be easily damaged when removed and installed unless proper procedures are followed. Loosen duct clamps on adjacent ducts and avoid excessive use of force to remove the ducts. Prevent ducts from impacts against sharp-edged structure during maintenance activities.
　
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