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A
747-400 MAINTENANCE MANUAL
 C. Speed Sensor N1 Removal
 S 024-005
 (1)  
Do these steps to remove the speed sensor N1 (4):

 (a)  
Disconnect the electrical connector D95018 (P18) (1) from the speed sensor N1 (4).

 (b)  
Remove the two nuts (6) that attach the speed sensor N1 (4) to the load gearbox.

 (c)  
Turn the two screws (5) to loosen the speed sensor N1 (4).

 (d)  
Remove the speed sensor N1 (4).

 (e)  
Remove the two packings (2), (3) from the speed sensor N1 (4). 1) Discard the two packings (2), (3).

 (f)  
Make sure you install all necessary protection covers.

 TASK 49-61-02-404-009
 3.  Speed Sensor N1 Installation (Fig. 401)____________________________
 A. Consumable Materials
 (1)  
D00418 Oil - Aircraft Turbine Engine

 B.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 2 | Packing | 49-61-02 | 01 | 28 | | | 3 | Packing | | | 25 | | | 4 | Load Compressor Speed Sensor | | | 33 | | | | (Speed Sensor N1) | | | | 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

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747-400 MAINTENANCE MANUAL
SEE A
SEE B FWD
SPEED SENSOR N1
SEE C

FWD
A
SPEED SENSOR N2 SEE D
FWD
B
Speed Sensor Installation
Figure 401 (Sheet 1)

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A

747-400
MAINTENANCE MANUAL

1.  ELECTRICAL CONNECTOR, D95018 (P18)
6. NUT (2 LOCATIONS)
5. SCREW
(2 LOCATIONS)

4. SPEED
3.  PACKINGSENSOR N1
2. PACKING LOADFWD GEARBOX
SPEED SENSOR N1 C
11.  NUT (2 LOCATIONS)  7. SPEED SENSOR N2  ACCESSORY GEARBOX 
10.  9. PACKING ELECTRICAL CONNECTOR, D95015 (P15)  FWD 8. SPACER 
SPEED SENSOR N2 
D 

Speed Sensor Installation
Figure 401 (Sheet 2)

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L64717
A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 424-046
 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 speed sensor N1 (4):

 (a)  
Lubricate the two new packings (2), (3) with a light coat of engine oil.
　
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