S 765-031
(9)
Make sure the resistance is between 1425 and 1575 ohms.
S 085-031
(10)
Disconnect the multimeter.
S 485-032
(11)
Connect the multimeter between pins 1 and 4 of D4154P.
NOTE: This step measures the resistance in overheat loop B.
____
S 765-033
(12)
Make sure the resistance you measure is between 1425 to 1575 ohms.
S 085-033
(13)
Disconnect the multimeter.
S 085-208
(14)
Disconnect terminal stud No. 8 from the TS681, TS682 and TS683 loop A detectors.
S 485-174
(15)
Connect the ohmmeter between the terminal studs No.8 and No.10 on the detector, TS681, loop A.
S 975-175
(16)
Measure the resistance of the detector, TS681, (loop A).
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A
747-400 MAINTENANCE MANUAL
S 715-137
(17) Make sure the resistance is in the range shown below.
~............................................ | DETECTOR | RESISTANCE (OHMS) | .............................................. | TS681 | 4500 +/- 225 | .............................................. | TS682 | 4500 +/- 225 | .............................................. | TS683 | 4500 +/- 225 | .............................................. | TS684 | 1500 +/- 75 | 2..............….............................1
S 765-216
CAUTION:_______A 100VDC MEGGER VOLTAGE IS RECOMMENDED. A 250VDC MEGGER VOLTAGE IS RECOMMENDED ONLY IF THE ELEMENT HAS BEEN CLEANED.
(18) Use a dc power supply (apply no more than 250VDC between stud and case) to measure the resistance between one of the two terminal studs and the metal case.
NOTE: Insulation readings vary greatly if element is dirty.
____ Element should be cleaned if it does not meet the insulation requirement.
(a) Make sure the resistance is greater than 20 megohms (open circuit).
S 025-085
(19)
Replace the detector if the resistance value is out of the range (AMM 26-11-02/401).
(20)
Disconnect the ohmmeter from the detector TS681 (loop A).
S 085-209
(21)
Disconnect terminal stud No. 8 from the loop B detectors of TS681, TS682 and TS683.
(22)
Do the procedure again for the detector TS681 (loop B).
(23)
Do the procedure again for detectors TS682 through TS684.
S 085-124
S 915-131
S 915-176
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 415-210
(24)
Connect the terminal stud No. 8 for both loops A and B for detectors TS681, TS682 and TS683.
S 415-132
(25)
Connect the electrical connector D4230P and D4154P on the raceway panel which is on the top of the engine.
S 765-046
(26)
Do the system test again for the other engines.
K. Put the airplane back to its usual condition.
S 415-047
(1)
Close the thrust reverser half (AMM 78-31-00/201).
S 865-075
(2)
Close the circuit breakers and remove DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel 1) 6H1 FIRE EXTINGUISHER ENG 1&3 A 2) 6H2 FIRE EXTINGUISHER ENG 1&3 A 3) 6H3 FIRE EXTINGUISHER ENG 1&3 B 4) 6H4 FIRE EXTINGUISHER 2&4 A 5) 6H5 FIRE EXTINGUISHER APU 6) 6H6 FIRE EXTINGUISHER LOWER CARGO 7) 6C6 FIRE SW UNLOCK (COMBI or FREIGHTER) or
6H7 FIRE SW UNLOCK (PASSENGER)
S 865-128
(3) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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