~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Transmitter (outboard) | 29-33-01 | 15 | 15 | | | 1 | Transmitter (inboard) | | | 315 | | | 2 | Packing (O-ring)(outboard) | | | 10 | | | 2 | Packing (O-ring)(inboard) | | | 310 | | | 3 | Washer (outboard) | | | 25 | | | 3 | Washer (inboard) | | | 325 | | | 4 | Bolt (outboard) | | | 20 | | | 4 | Bolt (inboard) | | | 320 | 2......…........…...................................…..........….....….........1
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A
747-400
MAINTENANCE MANUAL

 C. References
 (1)  
AMM 12-12-01/301, Hydraulic Systems

 (2)  
AMM 20-22-01/601, Electrical Bonding

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

 (4)  
AMM 36-00-00/201, Pneumatic System

 (5)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (6)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 D.
Access

 (1)  
Location Zone
 454 System 1 - Strut Trailing Edge Fairing
 464 System 2 - Strut Trailing Edge Fairing
 474 System 3 - Strut Trailing Edge Fairing
 484 System 4 - Strut Trailing Edge Fairing

 (2)  
Access Panel
 454A Trailing Edge Fairing Doors - Nacelle Strut 1
 464A Trailing Edge Fairing Doors - Nacelle Strut 2
 474A Trailing Edge Fairing Doors - Nacelle Strut 3
 484A Trailing Edge Fairing Doors - Nacelle Strut 4

 E.
Procedure

 S 144-035
 (1)  
Clean the mating surfaces of the hydraulic reservoir and the transmitter (1) to make a good electrical bond (AMM 20-22-01/601).

 S 644-012

 (2)  
Lubricate the new O-ring (2) with hydraulic fluid.

 S 434-013

 (3)  
Install the O-ring (2) in the groove at the bottom of the
 transmitter (1).

 S 424-014
 CAUTION:_______INSTALL THE TRANSMITTER (1) CAREFULLY. IF YOU DO NOT INSTALL THE TRANSMITTER CAREFULLY, YOU CAN CAUSE DAMAGE TO THE TRANSMITTER OR THE RESERVOIR.
 (4)  
Do these steps to install the transmitter (1):

 (a)  
Put the transmitter (1) in the opening in the hydraulic reservoir.

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747-400 MAINTENANCE MANUAL
 (b)  Install the four washers (3) and the bolts (4).
 S 764-030
 (5)  Measure the electrical resistance between the transmitter (1) and the hydraulic reservoir (AMM 20-22-01/601).
 NOTE: This resistance must be less than 0.0025 ohms.
____
 S 434-015
 (6)  
Connect the electrical connector (5) to the transmitter (1).

 S 914-016

 (7)  
Put the drain valve, on the hydraulic reservoir, in the closed position.

 S 434-036

 (8)  
Safety the drain valve in the closed position with a lockwire.

 S 864-032

 (9)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7 Overhead Circuit Breaker Panel.
 1) 7G04 HYDRAULICS FLUID QTY

 (b)  
P414 main power distribution panel.
 1) E25 HYD FLUID QTY IND

 S 864-026
 (10) Put the handle of the selector valve in the position for the applicable hydraulic system.
 NOTE: The selector valve is in the left wheel well for the body
____
 landing gear.

 S 614-027
 (11) Add the hydraulic fluid to the hydraulic reservoir until the fluid level is at the center of the sight glass (AMM 12-12-01/301).
　
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