4.  GROUND STRAP
B
Serial Number Identification Unit Installation
Figure 201 (Sheet 1)

L76618
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747-400
MAINTENANCE MANUAL

(2 LOCATIONS)
SERIAL NUMBER IDENTIFICATION UNIT

Serial Number Identification Unit Installation
Figure 201 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 (d) Make sure you install all necessary protection covers.
 TASK 49-61-10-402-026
 3.  Serial Number Identification Unit Installation (Fig. 201)
______________________________________________
 A.  References
 (1)  
AMM 31-61-00/201, Integrated Display System

 B.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 5 | Serial Number Identification Unit | 49-61-10 | 02 | 35 | 2.......….......…...................................…...........…......….......1

 C.  
Access

 (1)  
Location Zones
 221 Control Cabin - Left
 222 Control Cabin - Right
 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 D.  
Procedure

 S 422-027
 CAUTION: MAKE SURE YOU DO NOT HIT THE AIR INLET PLENUM WITH YOUR HANDS
_______ OR YOUR TOOLS. DAMAGE TO THE AIR INLET PLENUM CAN OCCUR.
 CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
 (1)  
Do these steps to install the serial number identification unit (5):

 (a)  
If the serial number identification unit (5) is a new or a different serviceable part, do this task: Serial Number Identification Unit Calibration (Par. 4).

 (b)  
Put the serial number identification unit (5) on the air inlet plenum with the washer (1) and bolt (2).

 (c)  
Install the ground strap (4) on the serial number identification unit (5) with the washer (1) and bolt (2).

 (d)  
Tighten the two bolts (2) to 36-40 inch-pounds (4.1-4.5 newton-meters).

 (e)  
Do these steps to connect the electrical connector D95012 (P12)

 (3)
 to the serial number identification unit (5):

 1)  Connect the electrical connector D95012 (P12) (3) to the serial number identification unit (5).
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 2)  Tighten the coupling ring on the electrical connector D95012 (P12) (3) until the electrical connector is at the bottom of the receptacle and the connection is tight.
 3)  Make sure the electrical connection is not loose when you move the APU harness.
 E.  Serial Number Identification Unit Installation Test
 S 862-041
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 S 862-031
　
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