(a)
FIRE PROTECTION DETECTION OVHT WHL WELL WNG BDY
(b)
FIRE PROTECTION DETECTION MASTER WARN & CONTROL
(c)
MASTER CAUTION AIR COND
B. Local Test Procedure
(1)
Push the LOC TEST switch on the M237 compartment overheat accessory unit.
(a) Code 90 is displayed on the M237 LED display while the self test is being performed.
(2)
If alarm/fault condition is detected, the code for that fault will be displayed. Push the LOC TEST switch to continue the test.
(3)
When the test is complete, code 99 is displayed.
(4)
Push the LOC TEST switch to blank the display.
NOTE: If the LOC TEST switch is not pushed, the display will blank in approximately 2 minutes.
C. Memory Read Procedure
(1)
Push the MEM READ switch on the M237 compartment overheat accessory unit.
NOTE: Up to ten alarm/fault codes can be stored in non-volatile memory. Code 97 indicates all codes have been read.
(2)
Repeat step (1) until all alarm/fault codes have been read and code 97 is displayed.
(3)
Push the MEM READ switch to blank the display.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Memory Clear Procedure
(1)
Push the DISP TEST switch on the M237 compartment overheat accessory unit.
(a) Ensure code 88 is displayed.
(2)
Push the LOC TEST switch on the M237 compartment overheat accessory unit.
(a) Ensure code 99 is displayed.
(3)
Push the MEM READ switch until the alarm/fault code to be cleared is displayed.
NOTE: Existing alarm/fault conditions cannot be cleared until the condition is corrected.
(4)
Repeat steps (3) and (4) until all selected codes have been cleared.
(5)
Push MEM READ switch until code 97 appears.
(6)
Push either MEM READ switch or MEM CLEAR switch to blank the display.
E. Alarm History Memory Read Procedure
(1)
Push the LOC TEST switch on the M237 compartment overheat accessory unit until code 99 is displayed.
(2)
Push the MEM READ switch on the M237 compartment overheat accessory unit until code 97 is displayed.
(3)
Push and hold the DISP TEST switch and then push and hold the MEM READ switch.
(4)
Release the DISP TEST switch.
(5)
Release the MEM READ switch.
(a) The display will show the latest alarm/fault history code.
(6)
Push the MEM READ switch to display the next code.
(7)
Repeat step (6) until code 97 appears.
(8)
Push the MEM READ switch to clear the display.
F. Alarm History Memory Clear Procedure
(1)
Push the LOC TEST switch on the M237 compartment overheat accessory unit until code 99 is displayed.
(2)
Push the MEM READ switch until code 97 is displayed.
(3)
Push and hold the LOC TEST switch.
(4)
Push and hold the MEM READ switch.
(5)
Release the LOC TEST switch.
(6)
Release the MEM READ switch.
(a) Code 96 will be displayed for approximately 5 seconds.
(7)
During the 5 seconds that code 96 is displayed, push the MEM CLEAR switch.
(8)
Push the MEM CLEAR switch to clear the displayed code.
NOTE: The LED display will blank.
(9)
Push the MEM READ switch to display the next code.
(10)
Repeat steps (8) and (9) until code 97 is displayed.
(11)
Push either MEM READ or MEM CLEAR switch to blank the display.
G. Restore Airplane to Normal
(1) Remove electrical power if no longer required (Ref 24-22-00 MP).
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WING AND LOWER AFT BODY OVERHEAT DETECTION SYSTEM -ADJUSTMENT/TEST
1. Wing and Lower Aft Body Overheat Detection System Test
A. General
(1) The following procedure tests only the lights, components and airplane wiring associated with the wing and lower aft body overheat detection system. Other lights, components and wiring associated with the overheat detection systems are checked when the wheel well overheat detection system is tested. See Chapter 26-17-13.
B. Prepare System for Test
(1)
Connect external power to the airplane.
(2)
Ensure the following circuit breakers on load control center P6 are closed.
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