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26-11-00
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A
747-400 MAINTENANCE MANUAL
I. Engine Detector Element Resistance Test
S 035-211
(1)
Disconnect electrical connectors D4200P, D4230P, D4154P, and D4228P on the raceway panel which is installed on the top part of the engine.
S 765-017
(2)
Connect the multimeter between pin 2 of D4200P and pin 15 of D4230P.
NOTE: This step measures the resistance in fire loop A.
____
S 765-018
(3)
Make sure the resistance is not more than 32 ohms.
S 765-019
(4)
Connect the multimeter between pin 2 of D4154P and pin 2 of D4228P.
NOTE: This step measures the resistance in fire loop B.
____
S 765-020
(5)
Make sure the resistance is not more than 32 ohms.
S 765-021
(6)
Connect the multimeter between pin 1 of D4200P and pin 14 of D4230P.
NOTE: This measures the resistance in overheat loop A.
____
S 765-022
(7)
Make sure the resistance is not more than 5 ohms.
(8)
Connect the multimeter between pin 1 of D4154P and pin 1 of D4228P.
S 765-023
NOTE: This steps measures the resistance in the overheat loop B.
____
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26-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 765-024
(9)
Make sure the resistance is not more than 5 ohms.
S 765-283
(10)
Measure the resistance between the terminal lugs at room
temperature.
(a) Make sure the resistance is not more than these values:
~............................................ | DETECTOR | MAXIMUM RESISTANCE (OHMS) | .............................................. | T681 | 9.0 | .............................................. | T682 | 9.3 | .............................................. | T683 | 2.2 | .............................................. | T684 | 2.4 | 2..............….............................1
J. AIRPLANES WITH SYSTRON DONNER FIRE DETECTION SYSTEMS; Engine Detector Element Resistance Test
S 085-212
(1)
Disconnect the electrical connectors D4230P and D4154P on the raceway panel which is on the top of the engine.
S 485-026
(2)
Connect the multimeter between pins 15 and 16 of D4230P.
NOTE: This step measures the resistance in fire loop A.
____
S 765-027
(3)
Make sure the resistance you measure is between 1425 and 1575 ohms.
S 085-027
(4)
Disconnect the multimeter.
(5)
Connect the multimeter between pins 2 and 3 of D4154P.
S 485-028
NOTE: This step measures the resistance in fire loop B.
____
S 765-029
(6) Make sure the resistance is between 1425 and 1575 ohms.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 085-029
(7) Disconnect the multimeter.
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