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 NOTE: The CMC ground test FAIL> indication may appear as a result
____ of circuit breakers being open or an actual fault may exist on a related fire/overheat protection system. The Bleed "SYSTEM FAULT" light may be on along with all four engines "Bleed X" EICAS messages.
 S 865-015
 (10) Set both of the following switches to "NORM" position:
 (a)  
S2089 Ground Test Enable Switch (P461)

 (b)  
S2090 Remote Test Enable Switch (RCDU).

 S 865-084
 (11) Put the airplane back to its usual condition.
 TASK 26-18-00-705-077
 3.  Thermal Switch Set Temperature Test____________________________________
 A. Special Tools and Equipment
 (1)  
H294 or H394 Thermal Switch Tester, Howell

 (2)  
Power Cable, BH23859-115 or BH23859-230, Howell

 (3)  
Heat Probe BH28456, Howell

 (4)  
Thermal Switch Cable, BH1338-1, Howell

 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 26-18-02/401, Thermal Switch

 (3)  
AMM 27-81-00/201, Leading Edge Flap System

 (4)  
AIPC 26-18-01, Fig. 2

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A
747-400
MAINTENANCE MANUAL

 (5)  
WDM 26-18-11 thru WDM 26-18-12

 C.
Access

 (1)  
Location Zone
 221 Control Cabin LH
 222 Control Cabin RH
 511 Leading Edge to Front Spar, Left
 611 Leading Edge to Front Spar, Right

 D.
Procedure

 S 485-040
 (1)  
Select the correct probe.
 ~.....................................
 | THERMAL SWITCH | HOWELL PROBE |
 .......................................
 | Elmwood Part Number |
 .......................................
 | 3100-250-1 | BH28456 |
 .......................................
 | 3100-250-2 | BH28456 |
 .......................................
 | 3100-250-3 | BH28456 |
 ......................…................
 | Sundstrand (Kistler) Part Number |
 .......................................
 | 975-0304-001 | BH28456 |
 .......................................
 | 975-0304-002 | BH28456 |
 .......................................
 | 975-0304-003 | BH28456 |
 2.....................…...............1

 S 745-080

 (2)  
Make sure that the EICAS does not show the BLD DUCT LEAK C, BLD DUCT LEAK R, or BLD DUCT LEAK L Caution messages.

 S 015-036

 (3)  
Get access to the thermal switches in the wing leading edge. Refer to AMM 27-81-00/201, Leading Edge Flap System.

 NOTE:  The thermal switch must be removed from the bracket to
____ prevent heat transfer that can cause an incorrect reading.
 S 865-037
 (4)  Put the POWER switch to the OFF position on the H294 or H394 Thermal Switch Tester.
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A
747-400
MAINTENANCE MANUAL

 S 495-038
 (5)  
Connect the power cable BH23859-115 or BH23859-230B to the POWER receptacle and to the applicable power source (115 or 230 volts ac, 50-60 Hz).

 S 495-039

 (6)  
Connect the heater cable BH405 to the applicable probe and to the HEATER receptacle on the Thermal Switch Tester H294 or H394.

 NOTE: Test equipment accuracy can be affected by air movement in
____ the area of the Tempcal probe. Always attempt to reduce the amount of air movement near the Tempcal probe.
 S 485-079
 (7)  
Put the thermal switch into the probe.
　
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