(2)
The warning lights may be tested individually by a press-to-test feature or are tested when the master caution test switch is closed.
B. Test Switch
(1) A switch is provided for testing the wing and lower aft body overheat detection system. Pressing the test switch grounds the sensing elements. If all circuits are operating correctly, the overheat warning lights will illuminate.
NOTE: On airplanes with the Fenwal M237 compartment overheat
____ accessory unit, the overheat warning indications require holding the test switch for approximately 4 seconds.
C. Master Caution Lights Control Section
(1)
The master caution lights control section provides control of the master caution lights and air condition annunciator light on the lightshield module P7.
(2)
When an overheat warning occurs, the compartment overheat accessory unit provides a ground to the control section. The ground completes switching circuits which allows the master caution lights and master caution air conditioning annunciator light on P7 to illuminate. Either master caution light may be pressed to reset the master caution lights and annunciator lights.
3. AIRPLANES WITH BOEING M237 COMPARTMENT OVERHEAT ACCESSORY UNIT; Compartment Overheat Accessory Unit Components (Fig. 2)
______________________________________________
A. The compartment overheat accessory unit is on electronic equipment rack E3 in the electronic compartment.
B. Temperature Control Units A1 and A2
(1) The temperature control units plug in to the accessory unit and are held in place by screws. Each control unit contains circuitry to continuously monitor sensing element resistance and provide an alarm signal when the element resistance drops to the trip level. When the overheat condition has passed, the system returns to its standby condition.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-18-00
ALL ú ú 01 Page 3 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
OVERHEAT DETECTORS DETECTOR, OVERHEAT SECTION 58
SEE A M276
AFT CARGO
AIR CONDITIONING RIGHT AIR COMPARTMENT
MODULE (P5) CONDITIONING PACK OVERHEAT M347, M348, M1147 OVERHEAT DETECTORS,
SEE B DETECTORS, AFT
M356, M271 KEEL BEAM
OVERHEAT
DETECTOR,
BLEED AIR DUCT M273
RIGHT WING
LEADING EDGE
OVERHEAT DETECTOR,
M1204
RIGHT ENGINE
STRUT CAVITY
OVERHEAT DETECTOR, M488 SECTION 56
OVERHEAT
DETECTOR,
M275
RIGHT WING M269, M371 DETECTOR, OVERHEAT FORWARD KEEL DETECTORS, BEAM OVERHEAT DUCT LEFT BLEED AIR DETECTOR, EDGE OVERHEAT WING LEADING
M272 LEFT WING M1205
OVERHEAT LEFT ENGINE
DETECTORS, STRUT CAVITY
M370, M268 OVERHEAT
DETECTOR,
LEFT AIR CONDITIONING M487
PACK OVERHEAT DETECTORS,
M355, M274
A
Wing and Lower Aft Body Overheat Detector System - Component Location
Figure 1 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-18-00
ALL ú ú 01 Page 4 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
A DUAL BLEED B FULL OPEN RAM DOOR B RAM DOOR FULL OPEN
WING RESET 0 OFF ON 1 OFF HIGH PACK TRIP OFF A WING-BODY OVERHEAT OFF ON APU 2 A BLEED TRIP OFF A PACK TRIP OFF A WING-BODY OVERHEAT A BLEED TRIP OFF A ANTI ICE WING ANTI ICE TRIP PSI 40 60 80 100 BLEED RECIRC FAN OFF TEST OVHT R PACKISOLATION OFF HIGH VALVE CLOSE AUTO OPEN L PACK AUTO AUTO AUTO
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