S 795-046

 (41)
 Pressurize the applicable system with the EDP and the demand pump (AMM 29-11-00/201).

 (a)  
Examine the pump connections for leakage.

 S 415-047
 (42) Close the right thrust reverser half (AMM 78-31-00/201).
 S 415-050
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (43)
 Close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 S 865-051

 (44)
 Remove electrical power if it is not necessary for other operations (AMM 24-22-00/201).

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A
747-400 MAINTENANCE MANUAL
 PRESSURE TRANSMITTER - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the pressure transmitter (referred to as the transmitter). The second task installs the transmitter. The second task also does a test of the transmitter.
 B.  The transmitters in hydraulic systems No. 1 and No. 4 are installed in the wheel well for the right body gear. These transmitters are in the top inboard forward corner of the wheel well. The transmitter in hydraulic system No. 2 is installed on the forward bulkhead of the wheel well for the left wing gear. This transmitter is approximately 3 feet inboard of the return module. The transmitter in hydraulic system No. 3 is in an equivalent location in the wheel well for the right wing gear.
 C.  The removal and installation procedures are the same for the transmitters in the four hydraulic systems.
 TASK 29-31-01-004-001
 2.  Pressure Transmitter Removal (Fig. 401)____________________________
 A.  References
 (1)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (2)  
AMM 32-00-30/201, Landing Gear Door Locks

 B.  
Access

 (1)  
Location Zone 765 System 1 - Body Landing Gear Wheel Well, RH 735 System 2 - Wing Landing Gear Wheel Well, LH 745 System 3 - Wing Landing Gear Wheel Well, RH 765 System 4 - Body Landing Gear Wheel Well, RH

 C.  
Procedure

 S 494-025
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  For hydraulic systems No. 1 and No. 4, do this task: Body Landing Gear Door Lock Installation (AMM 32-00-30/201).
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747-400 MAINTENANCE MANUAL
SEE B
SEE  A  SEE  B 
BRACKET MOUNTING 
1.  HYDRAULIC TUBE  2. PRESSURE TRANSMITTER 
7.  ELECTRICAL CONNECTOR 
1.  HYDRAULIC TUBE 
SNUBBER PACKING JAMNUT 5. 6. WASHER 4. 3. 

SYSTEM 1 AND SYSTEM 4 INSTALLATION
A

Pressure Transmitter Installation
Figure 401 (Sheet 1)

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A
747-400
MAINTENANCE MANUAL

SYSTEM 2 AND SYSTEM 3 INSTALLATION

Pressure Transmitter Installation
Figure 401 (Sheet 2)

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