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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Neither light agrees with switch position (Cont) Overheat protec-tion does not close valves when air tem-perature exceeds 125`C Defective valve control circuit (Cont) Defective over-heat control circuit Disconnect receptacle D462 from P5-11 module and check for continuity to ground while heating either in accordance with system adjustment/test procedure. IF -No continuity - Remove receptacle from thermal switch and check for con-tinuity across pins 1 and 2 while conducting test. IF -No continuity -Continuity OK -Continuity OK -Continuity -No continuity -thermal switch to 125`C Replace defective switch (Ref 30-11-21, R/I) Repair wiring between module receptacle and thermal switch receptacles Replace P5-11 module (Ref 30-11-41, R/I) Repair wiring between module receptacle and switch receptacle Replace thermal switch (Ref 30-11-21, R/I)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
WING THERMAL ANTI-ICING SYSTEM - MAINTENANCE PRACTICES
______________________________________________________
1. General_______
A. This procedure contains a functional test of the wing TAI valve and thermal switch.
TASK 30-11-00-722-002
2. Wing TAI Valve and Thermal Switch Function Test_______________________________________________
A. Special Tools and Equipment
(1) Temp-Cal Probe Heater BH 3884-40 (attachment to
Jet-Cal engine analyzer) or
H294 Temp-Cal Thermal Switch Tester or
H394 Temp-Cal Tester with adapter cable BH405
BH24944 Heater Probe Kit (basic P/N)
NOTE: This kit is necessary to use the
____ testers listed above. There are different dash number kits for specific airplane model and tester combinations. Please consult with supplier.
Howell Instruments 3479 West Vickery Blvd. Fort Worth, Texas 76107
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 12-30-00/201, WIng Lower Surface Access Panels
(3)
AMM 30-11-21/401, Wing Anti-Ice Ground Overheat Thermal Switch -Removal/Installation
C. Access
(1)
Location Zone
101 Control Cabin - Left
507 Left Nacelle - Strut
607 Right Nacelle - Strut
(2)
Access Panel
6307L Slat Access Panel Removable
6407L Slat Access Panel Removable
5727L Access Door Strut
5827R Access Door Strut
D. Prepare for the test.
S 862-005
(1)
Supply electrical power (AMM 24-22-00/201).
S 862-006
(2)
Make sure these circuit breakers are closed:
(a)
ANTI-ICE & RAIN - ENGINE #1 AND WING
(b)
ANTI-ICE AND RAIN - WING VALVE
(c)
AIR/GND RELAY & LIGHTS
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(d) NOSE GEAR AIR/GND
S 712-007
(3) Momentarily push the L VALVE OPEN and the R VALVE OPEN lights on the P5-11 panel.
NOTE: Each light will come on, then go off.
____
S 862-008
(4) Make sure the thrust levers are in the IDLE position.
S 012-009
WARNING:_______STAY CLEAR OF THE LEADING EDGE SLATS AND FLAPS. THE FLAPS AND THE SLATS CAN ACCIDENTALLY OPERATE QUICKLY. THIS CAN CAUSE INJURY TO PERSONS.
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