(a)
Remove the screws to remove the top cover from the PSEU.

 (b)
Loosen the allen head, card-lock fasteners.

 (c)
Remove the circuit card with the card extractor.

 CIRCUIT CARD TABLE
 ~................................................................ | CARD | | | NUMBER | NAME | .................................................................. | A1 | MICROPROCESSOR CIRCUIT CARD | | A2 | PROXIMITY CIRCUIT CARD | | A3 | LOGIC DRIVER CIRCUIT CARD | | A4 | SPARE SLOT | | A5 | SPARE SLOT | | A6 | TR/AR NO. 4 ENG CIRCUIT CARD | | A7 | TR/AR NO. 3 ENG CIRCUIT CARD | | A8 | TR/AR NO. 2 ENG CIRCUIT CARD | | A9 | TR/AR NO. 1 ENG CIRCUIT CARD | | A10 | SPARE SLOT | | A11 | PROXIMITY CIRCUIT CARD | | A12 | LOGIC DRIVER CIRCUIT CARD | | A13 | PROXIMITY CIRCUIT CARD | | A14 | MICROPROCESSOR CIRCUIT CARD | 2........….......................................................1
 TABLE 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 32-09-04-404-006
 3. Install the Circuit Card
________________________
 A. References
 (1)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 32-09-03/401, Proximity Switch Electronics Unit

 (3)  
AMM 32-09-03/501, Proximity Switch Electronics Unit

 B.
Access

 (1)  
Location Zone 117 Left Electrical and Electronics Compartment

 C.
Procedure (Fig. 401)

 S 914-007
 CAUTION: DO NOT TOUCH THE CIRCUIT CARDS BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CIRCUIT CARDS.
 (1)  
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).

 S 424-008

 (2)  
Install the circuit card in the PSEU.

 (a)  
Push the card in the slot two inches.

 (b)  
Align the guide pins for the connector.

 (c)  
Push the card into its slot fully.

 (d)  
Tighten the allen head, card-lock fasteners.

 (e)  
Install the cover for the PSEU with the screws.

 S 414-009
 (3)  
Install the PSEU (AMM 32-09-03/401).

 (a)  
Make sure you do the PSEU operational test after you install the PSEU.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

4.

5.

A
747-400 MAINTENANCE MANUAL
 MAIN LANDING GEAR AND DOORS - DESCRIPTION AND OPERATION
_______________________________________________________
General
_______
 A.  The main landing gear consists of four main gears; two wing gears and two body gears. Doors to close each wheel well are associated with each gear.
Wing Landing Gear
_________________
 A.  Each wing gear is attached to the structure through a trunnion and trunnion fork supported at the forward end by the wing rear spar and at the aft end by the landing gear support beam. The gear retracts inboard and forward into the wing gear wheel well. Details of the wing gear assembly and installation are presented in 32-11-00/001.
Wing Gear Doors
_______________
 A.  The wing gear doors consist of wheel well doors and shock strut doors. The two wheel well doors are hinged together and actuated hydraulically. The two shock strut doors are hinged together and are mechanically actuated by the strut. Further information on wing gear doors will be found in 32-12-00/001.
Body Landing Gear
_________________
 A.  Each body gear is attached to the structure through a trunnion cantilevered from supports on the aft bulkhead of the body gear wheel well. The gear retracts straight forward and up into the body gear well. Details of the body gear assembly and installation are presented in 32-13-00/001.
　
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