(10)
 Repeat the APU Air Duct Detection Circuit Check for thermal switches S970, S971, S972, S973, S974, S975, S976, S977, S978, S979, S980, S981, S982, S983, S1173, S1924, S984, S985, and S986 in sequence. Refer to AMM 26-19-01/401 for access of thermal switches.

 S 865-033

 (11)
 Repeat the APU Air Duct Detection Circuit Check for thermal switches S2207, S2208, S2209, S2210, S2211, S2212, and S2213. Refer to AMM 26-19-01/401 for access thermal switches.

 G. Thermal Switch Set Temperature Test
 S 945-065
 (1)  Select the correct probe.
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747-400
MAINTENANCE MANUAL

 ~..................................... | 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 745-123
 (2)  Make sure that the EICAS does not show the BLD DUCT LEAK C, BLD DUCT
 LEAK R, or BLD DUCT LEAK L Status messages.
 S 015-034
 (3)  Get access to the thermal switch S969 in the aft cargo compartment.
 NOTE:____ The thermal switch must be removed from the bracket so that
 heat transfer will not occur which may cause an incorrect
 reading.

 S 865-035
 (4)  
Put the POWER switch to the OFF position on the H294 or H394 Thermal Switch Tester.

 S 495-036

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

 S 495-037

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

 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.
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A
747-400 MAINTENANCE MANUAL
 S 485-038
 (7)  
Put the thermal switch S969 into the probe.

 S 495-068

 (8)  
Connect the thermal switch cable to the thermal switch receptacle on the tester and fasten the cable clip to the terminals of the thermal switch to be tested.

 ~................................................................ | THERMAL SWITCH | OPEN TEMP | CLOSE TEMP | DEADBAND | ..................….................….................…........... | Elmwood Part Number | .................................................................. | 3100-250-1 | 180 |20°F | 200 |20°F | 7°F | | | 82 |11°C | 93 |11°C | 4°C | .................................................................. | 3100-250-2 | 220 |23°F | 250 |23°F | 12°F | | | 104 |13°C | 121 |13 C | 7°C | .................................................................. | 3100-250-3 | 270 |23°F | 300 |23°F | 12°F | | | 135 |13°C | 148 |13°C | 7°C | ..................….................….................…........... | Sundstrand (Kistler) Part Number | .................................................................. | 975-0304-001 | 180 |20°F | 200 |20°F | 7°F | | | 82 |11°C | 93 |11°C | 4°C | .................................................................. | 975-0304-002 | 220 |23°F | 250 |23°F | 12°F | | | 104 |13°C | 121 |13°C | 7°C | .................................................................. | 975-0304-003 | 270 |23°F | 300 |23°F | 12°F | | | 135 |13°C | 148 |13°C | 7°C | 2.................….................….................…..........1
　
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