(b)
If DUCT LEAK BITE is recorded on EICAS maintenance page, further testing is required at the control card (P50).
(c)
At the control card (P50), pressing DISP TEST switch tests the display and associated circuits. 88 is displayed as long as the switch is pressed if there is no failed DC power source.
(d)
Momentarily pressing the LOC TEST switch initiates a self-test sequence. While the local test sequence is performed, the display indicates a 90 if only one loop is being tested or 91 if both loops are being tested. If a fault condition is detected during the test sequence, the code for that fault condition is indicated by the display for two minutes. Another momentary pressing of the LOC TEST switch during the two-minute display interval causes the test sequence to continue. If not continued, the test sequence terminates after the two minutes. When the entire test sequence has been performed, a 99 is displayed for one minute and then the test sequence terminates. The test sequence initiated by momentarily pressing the LOC TEST switch can be terminated at any time by momentarily operating the display test switch.
(e)
Momentarily pressing the MEM READ switch displays the last fault code stored in memory. This operation can be repeated until all fault codes in memory have been displayed. Code 97, the memory read complete code, will then be displayed.
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MAINTENANCE MANUAL
(f)
To obtain the alarm history, press DISP TEST and then MEM READ. Release DISP TEST and then MEM READ. The last alarm code stored in memory will be displayed. Momentarily pressing MEM READ will continue displaying the alarm codes on a last in first out basis. Code 97, the memory read complete code, will then be displayed.
(g)
The data stored in the alarm and maintenance memory can be erased or transferred to the alarm history memory if required. This is done by completing the local test sequence, and momentarily pressing MEM READ until data to be erased/transferred is displayed and then pressing MEM CLR.
C. Control
_______
(1) The system is active whenever it receives electrical power from P11 panel circuit breakers DUCT LEAK DET LEFT, DUCT LEAK DET RIGHT and DUCT LEAK CONT.
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FAULT ISOLATION/MAINT MANUAL
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE AMM
CARD - DUCT LEAK AND WHEEL WELL FIRE CONTROL, 3 1 119BL, MAIN EQUIP CTR, P50 26-10-01
M691
CARD - DUCT LEAK AND WHEEL WELL FIRE PWR 3 1 119BL, MAIN EQUIP CTR, P50 26-10-01
SUPPLY, M10428
CIRCUIT BREAKER - 1 FLT COMPT, P11
DUCT LEAK CONT, C4261 1 11Q26 *
DUCT LEAK DET LEFT, C4207 1 11Q17 *
DUCT LEAK DET RIGHT, C4208 1 11Q25 *
COMPUTER - (FIM 31-41-00/101)
EICAS L, M10181
EICAS R, M10182
DETECTOR - DUCT LEAK, TS5157,TS5158,TS5260, 2 8 L WING LOOP, ZONE 1 26-18-01
TS5159,TS5160,TS5161,TS5162,TS5259
DETECTOR - DUCT LEAK, TS5167,TS5168,TS5163, 2 6 L PACK BAY, ZONE 2 26-18-01
TS5164,TS5166,TS5165
DETECTOR - DUCT LEAK, TS5169,TS5170 2 2 MAIN WHEEL WELL, ZONE 3 26-18-01
DETECTOR - DUCT LEAK, TS5171,TS5172,TS5173, 2 10 BODY LOOP, ZONE 4, SEC 46 26-18-01
TS5174,TS5179,TS5180,TS5175,TS5176,TS5177,
TS5178
DETECTOR - DUCT LEAK, TS5181,TS5182,TS5183, 2 4 BODY LOOP, ZONE 5, SEC 48 26-18-01
TS5184
DETECTOR - DUCT LEAK, TS5185,TS5186,TS5187, 2 6 R WING LOOP, ZONE 6 26-18-01
TS5188,TS5189,TS5190
DETECTOR - DUCT LEAK, TS5191,TS5192 2 2 R PACK BAY, ZONE 7 26-18-01
LIGHT - L WING BODY OVHT, YNNL001 2 1 FLT COMPT, P5, BLEED AIR CONT, *
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