(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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 23 Page 509 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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