S 024-019
(12)
Install the electrical connectors on the end fittings and attach them with a lock wire.
S 764-020
(13)
Do a check of the electrical bond resistance between the element and the airplane structure (SWPM 20-20-00).
(a) Make sure the resistance is not more than 0.005 ohm.
S 864-021
(14) Close this circuit breaker:
(a) P6 Load Control Center Panel
1) OVHT WHL WELL WING BDY
S 714-022
(15) Do a test of the wheel well overheat detection system (AMM 26-17-00/501).
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737-300/400/500MAINTENANCE MANUAL
WHEEL WELL OVERHEAT DETECTION SENSING ELEMENT - ADJUSTMENT/TEST
_______________________________________________________________
1. General
_______
A. This procedure contains one task which does a test of the sensing element for the wheel well overheat detection system.
B. Use a wire end fitting between the element end fitting and the test equipment. Attach the test leads to the center contacts or the center contact and outer shell of the wire end fittings, as applicable. Use the wire end fittings to decrease the possibility of damage to the electrical contact surface and supply a positive attach point for the test equipment. Be careful during the test so that no dirt or other contamination gets on the end fittings. Replace the electrical connector or protective caps when you complete the tests.
TASK 26-17-11-725-001
2. Wheel Well Overheat Detection Sensing Element Test
__________________________________________________
A. General
CAUTION: DO NOT USE A MULTIMETER ON THE SENSOR ELEMENTS IF THE ELEMENT'S
_______ TEMPERATURE IS ABOVE 155 DEGREES F (68 DEGREES C). IF THE TEMPERATURE IS BELOW 155 DEGREES F (68 DEGREES C) BUT ABOVE 70 DEGREES F (21 DEGREES C), LIMIT METER USE TO FIVE SECOND APPLICATIONS WITH NO MORE THAN 2 APPLICATIONS PER MINUTE. IF THE TEMPERATURE IS BELOW 70 DEGREES F (21 DEGREES C), THE METER MAY BE USED WITHOUT RESTRICTION. IF THESE REQUIREMENTS ARE NOT FOLLOWED, DAMAGE TO THE SENSOR ELEMENT MAY OCCUR.
(1) Do a test of the sensing loop only when all the units in the system are stable at ambient temperature. If an element does not sufficiently complete the tests that follow, replace the element.
B. Equipment
(1)
Multimeter
(2)
Wire End Fitting 35303-10, Fenwal Incorp., Ashland Mass.
NOTE: Use the wire end fittings to attach the test equipment to the
____
sensing element.
(3) Wire End Fitting 35303-11, Fenwal Incorp., Ashland Mass.
NOTE: Use the wire end fittings to attach the test equipment to the
____
airplane wiring.
C. Access
(1) Location Zones
(a) 205, Electronic Compartment
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737-300/400/500MAINTENANCE MANUAL
(b)
212, 214, Left Right Air Conditioning Equipment Bay
(c)
216, 217, Left Right Main Wheel Well
(d)
218, Aft Cargo Compartment
(e)
303, 403, Left Right Wing Inboard Leading Edge
(f)
507, 607, Left Right Nacelle Strut
(g)
701, Tail Compartment
(h)
703, APU Compartment
D. Sensing Element Test
S 865-004
(1)
Disconnect the electrical connectors, D840 and D842, on the ceiling of the main wheel well.
S 725-003
(2) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 防火 FIRE PROTECTION(61)
