30-81-00
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A
747-400 MAINTENANCE MANUAL
 S 445-027
 (11)
 Do this task:  "Put Safety-Sensitive Systems Back to the Condition before Air Mode Simulation" (AMM 32-09-02/201).

 S 865-021

 (12)
 Remove electrical power (AMM 24-22-00/201).

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 30-81-00
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747-400 MAINTENANCE MANUAL
 ICE DETECTOR PROBE - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  This subject contains two tasks, one for the removal and one for the installation of the ice detector probe. In this procedure, you will remove the probe, install a replacement unit, and do an operational test of the ice detection system.
 B.  The removal and installation procedure is the same for the left and right ice detector probes.
 TASK 30-81-01-004-001
 2.  Ice Detector Probe Removal (Fig. 401)__________________________
 A.  Standard Tools and Equipment
 (1) Sealant Cutting Tool - hardwood or plexiglass
 B.  References
 (1)
SSM 30-81-01

 (2)
WDM 30-81-11

ICE DETECTOR AIRPLANE SKIN

ELECTRICAL CONNECTOR GAP
MOUNTING BOLTS (6 LOCATIONS)
NOTE:LEFT ICE DETECTOR PROBE INSTALLATION SHOWN.

Ice Detector Probe Installation
Figure 401

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747-400
MAINTENANCE MANUAL

 C. Access
 (1)  Location Zone 115 Area between Nose Gear Well and Fuselage, LH 116 Area between Nose Gear Well and Fuselage, RH
 D. Procedure
 S 864-002
 (1)  Open these circuit breakers:
 (a)  
P414, Left Power Distribution Center 1) 414L10, L ICE DETECTOR

 (b)  
P415, Right Power Distribution Center 1) 415L33, R ICE DETECTOR

 E. Procedure
 S 144-004
 WARNING: BEFORE YOU TOUCH THE ICE DETECTOR PROBE, MAKE SURE THAT IT IS
_______ NOT HOT. A HOT PROBE CAN CAUSE INJURY TO YOU IF YOU TOUCH IT.
 (1)  
Use a sealant cutting tool to remove sealant from the gap between the skin and the probe.

 S 024-005

 (2)  
Remove the ice detector probe:

 (a)  
Remove the 6 mounting bolts.

 (b)  
Hold the strut of the probe and move the probe from side to side to loosen the gasket.

 (c)  
Carefully pull the probe out from the airplane until you can touch the electrical connector on the back of the probe.

 (d)  
Disconnect the electrical connector from the probe.

 (e)  
Remove the probe.

 (f)  
Attach the wires to hold them outside the opening in the airplane skin.

 (g)  
Put a cap on the electrical connector on the wire bundle.

 (h)  
Remove the gasket and discard it.

 TASK 30-81-01-404-006
 3. Ice Detector Probe Installation (Fig. 401)
_______________________________
 A. Consumable Materials
 (1)  
B00083, Cleaner - Aliphatic Naphtha, TT-N-95

 (2)  
G00507, Cloth - Lint Free

 (3)  
A00247, Sealant - BMS 5-95, Class B

 B. References
 (1)  
AMM 30-81-00/501, Ice Detection System

 (2)  
AIPC 30-81-01, Fig. 1

 (3)  
SSM 30-81-01
　
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