(b)  
Remove the sealant material from the electrical terminals with the plastic scraper.

 (c)  
Make a note of the terminal location and the wire color (Ref WDM 32-61-13 primary sensor, WDM 32-61-22 alternate sensor).

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A
747-400
MAINTENANCE MANUAL

SEE A
TRUNNION CRANK FOR THE RETRACTION ACTUATOR
AFT BULKHEAD OF THE 
NOSE WHEEL WELL 
COVER 
JUNCTION 
BOX 
(J27) 
TERMINAL 
STRIP 
(T389) 

PRESSURE PAN
RECESS
RETRACTION ACTUATOR
CONDUIT
TRUNNION CRANK FOR THE RETRACTION ACTUATOR
PRIMARY UP SENSOR (S396)
ALTERNATE UP SENSOR (S411)
SPACER INBD
0.15 |0.03 INCH CLEARANCE (GEAR UP POSITION)
A-A
A 
SENSOR 
MOUNTING 
BOLT 
PRIMARY UP 
SENSOR (S396) 
A  ALTERNATE UP 
SENSOR (S411) 
CONDUIT 
NUT SPACER 
FWD 
A 

Nose Gear Up Sensor Installation
Figure 201

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747-400 MAINTENANCE MANUAL
 (d)  
Remove the sensor wires from the terminal strip.

 (e)  
Carefully remove the terminal lugs from the sensor wires.

 (f)  
Prepare a line that is longer than the conduit.

 NOTE: You will use this line to pull the sensor wires through
____ the conduit during the installation procedure.
 (g)  Attach the line to the sensor wires.
 S 022-010
 (2)
Do these steps to remove the up sensor for the nose gear:

 (a)  
Loosen the coupling nut at the sensor end of the conduit.

 (b)  
Remove the two mounting bolts and the nuts that attach the sensor to the pressure pan recess.

 (c)  
Carefully pull the sensor wires from the conduit.

 NOTE: Do not pull the line fully out of the conduit.
____
 (d)  
Remove the line from the sensor leads.

 (e)  
Remove the sensor from the airplane.

 TASK 32-61-02-402-011
 3. Install the Up Sensor for the Nose Gear
_______________________________________
 A. Consumable Materials
 (1)  
B00083 Solvent - Aliphatic Naphtha, TT-N-95, Type 2

 (2)  
A00082 Sealant - PR 1913 or
 A00083 Sealant PR 1933

 (3)  
C00046 Primer - (for use with PR 1913 or PR 1933)

 B.
References

 (1)  
AMM 32-00-30/201, Landing Gear Door Locks

 (2)  
AMM 32-09-02/201, Air/Ground Relay System

 (3)  
AMM 32-09-03/501, PSEU - Adjustment/Test

 (4)  
IPC 32-61-08 Fig. 2

 (5)  
WDM 32-61-13, Nose Gear Primary Display

 (6)  
WDM 32-61-22, Nose Gear Alternate Display

 C.
Access

 (1)  
Location Zone
 114 Nose Gear Wheel Well - RH

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747-400 MAINTENANCE MANUAL
 D. Install the Up Sensor (Fig. 201)
 S 432-047
 (1)  
Do these steps to install the up sensor for the nose gear:

 (a)  
Twist the sensor leads together.

 (b)  
Attach the line that you kept in the conduit (during the removal) to the sensor wires.
　
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