31-41-03
 ALL  ú ú 03 Page 405 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CALIBRATION MODULE - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. The first task is the removal of the calibration module (CM). The second task is the installation of the CM. The installation task contains steps to put an airplane identification number and calibration data into the CM.
 B.  The CM, M7293, is in the main equipment center on rack E2, shelf 4.
 C.  You must put an airplane identification number into the CM. The identification number is the airplane registration number which is in the WBC. (The airplane registration number, also referred to as the tail identification or tail sign (T/S), comes from the MAWEA, through the EIU, to the WBC. The number is identified on the WBC display as EIU T/S.)
 D.  You must also put calibration data into the CM. The CM keeps the calibration data for the weight and balance system. A new CM does not contain calibration data. You must compare the airplane registration numbers from the EIU and the WBC. If the numbers are the same, the CM automatically gets the calibration data from the WBC. If the numbers are different, you must put the calibration data from your written record into the CM.
 TASK 31-41-04-004-001
 2.  Calibration Module Removal__________________________
 A.  References
 (1)  AMM 20-41-01/201, Static Grounding Procedure
 B.  Access
 (1)  Location Zone 118 Electrical and Electronics Compartment, Right
 C.  Calibration Module Removal
 S 864-081
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P414 Power Distribution Center - Left 1) 414K20 WT & BAL

 (b)  
P415 Power Distribution Center - Right 1) 415G21 WBS CHB ALT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 31-41-04
 ALL  ú ú 16 Page 401 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-084
 CAUTION: DO NOT TOUCH THE CM BEFORE YOU DO THE STATIC GROUNDING
_______ PROCEDURE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CM.
 (2)  
Do the static grounding procedure (AMM 20-41-01/201).

 S 024-004

 (3)  
Remove the calibration module:

 (a)  
Disconnect the electrical connector.

 (b)  
Remove the four screws.

 (c)  
Remove the calibration module from the shelf.

 TASK 31-41-04-404-120
 3. Calibration Module Installation
_______________________________
 A. References
 (1)  
AIPC 31-41-06, Fig. 1

 (2)  
AMM 20-41-01/201, Static Grounding Procedure

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

 B. Access
 (1)  Location Zone 118 Electrical and Electronics Compartment, Right
 C. Calibration Module Installation
 S 864-106
 (1)  Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
 (a)  
P414 Power Distribution Center - Left 1) 414K20 WT & BAL

 (b)  
P415 Power Distribution Center - Right 1) 415G21 WBS CHB ALT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 31-41-04
 ALL  ú ú 14 Page 402 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-109
 CAUTION: DO NOT TOUCH THE CM BEFORE YOU DO THE STATIC GROUNDING
_______ PROCEDURE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CM.
 (2)  
Do the static grounding procedure (AMM 20-41-01/201).

 S 424-110

 (3)  
Install the calibration module:

 (a)  
Put the calibration module on the shelf.

 (b)  
　
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