(2)  
Controlled source of dry air or nitrogen, 75 psig maximum pressure.

 B.  
Consumable Materials

 (1)  
G00095 Detector - Leak, Leak-Tek (160X)

 C.  
References

 (1)  
AMM 06-09-09/201, Nacelle and Engine-to-Wing Fairing Access Doors and Panels

 (2)  
AMM 12-12-01/301, Hydraulic Systems

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AMM 36-00-00/201, Pneumatic System

 (6)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (7)  
AMM 54-62-02/501, Nacelle Strut Access Door

 D.  
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 464 System 2 - Strut Aft Fairing
 462 System 2 - Strut Torque Box - Left Side
 474 System 3 - Strut Aft Fairing
 472 System 3 - Strut Torque Box - Left Side
 484 System 4 - Strut Aft Fairing

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

 (2)  Access Panel 454AL Trailing Edge Fairing Doors - System 1 464AL Trailing Edge Fairing Doors - System 2 462HL Access Door - Lower Midspar Aft Pressure Relief -
System 2
 474AL  Trailing Edge Fairing Doors - System 3
 472HL  Access Door - Lower Midspar Aft Pressure Relief -
System 3 484AL Trailing Edge Fairing Doors - System 4
 E. Procedure
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)
Remove the pressure from the pneumatic system (AMM 36-00-00/201).

 S 015-004

 (3)  
Open the applicable doors in the trailing edge fairing
 (AMM 06-09-09/201 and AMM 54-62-00/201).

 S 015-005

 (4)  
For hydraulic systems 2 and 3, open the aft access door for pressure relief in the lower midspar (AMM 06-09-09/201 and AMM 54-62-00/201).

 S 865-006

 (5)  
Put the switch, L ISLN (R ISLN), for the wing isolation valve, on the overhead panel, P5, to the OFF position.

 S 865-007

 (6)
Open the bleed valve on the reservoir pressurization module to remove the pressure from the reservoir (AMM 29-11-00/201).

 S 615-008

 (7)  
Drain or fill the hydraulic reservoir, if it is necessary, until you can see the fluid level in the top sight glass (AMM 12-12-01/301).

 S 485-009

 (8)  
Connect a pressure gage to the port GA on the reservoir
 pressurization module.

 (9)
Pressurize the pneumatic system with the APU (AMM 36-00-00/201).

 S 865-010
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 975-058
 (10)
 Monitor the pressure gage which you connected to the reservoir pressurization module.

 S 865-033

 (11)
 Put the switch, L ISLN (R ISLN), for the wing isolation valve to the open position.

 S 975-034

 (12)
 Make a record of the time for the reservoir pressure to increase to 20 psig and then to 35 psig.

 S 975-035

 (13)
 Make sure the time to pressurize the reservoir to 20 psig and to 35 psig is not more than these limits: ~................................................................. | | Reservoir | Maximum Time to | | | Pressure (psig) | Pressurize (seconds) | ................................................................... | System 1 or 4 | 20 | 55 | | | 35 | 125 | ................................................................... | System 2 or 3 | 20 | 30 | | | 35 | 65 | 2..................…...................…..........................1

 S 795-012

 (14)
　
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