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747-400 MAINTENANCE MANUAL
(b) P7, Overhead Circuit Breaker Panel
1) 7H15 CARGO SMOKE DET LWR B
G. Detector Element Resistance Test
S 865-123
(1) Open these circuit breakers:
(a) P6, Main Power Distribution Panel 1) 6C5, ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT 2) 6H14, APU FIRE/BLD DUCT OVHT LOOP A 3) 6H15, APU FIRE/BLD DUCT OVHT LOOP B
S 035-120
(2)
Disconnect the electrical connectors DM216A and DM216D for the loop A and DM216B and DM216C for the loop B for the APU access door detector M216.
S 485-121
(3)
Connect a multimeter between the center contacts DM216A and DM216D (loop A) of the detector M216 at the room temperature.
S 725-122
(4)
Measure the resistance and make sure the resistance does not exceed
5.84 ohms.
S 085-123
(5)
Disconnect the multimeter.
S 485-124
(6)
Connect a multimeter between the center contacts DM216B and DM216C (loop B) for the detector element M216 at the room temperature.
S 725-125
(7)
Measure the resistance and make sure the resistance does not exceed
5.84 ohms.
(8)
Disconnect the multimeter.
S 485-127
(9)
Connect a megohmmeter between the center contact of the detector loop A (DM216A or DM216D) to the detector element shell (ground).
S 085-126
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S 725-128
(10) Apply 100 volts dc maximum and make sure the resistance is greater
than the minimum insulation resistance. ~.................................................................... | TEMPERATURE (DEGREES F) | MINIMUM INSULATION RESISTANCE (MEGOHMS)| ...................................................................... | 65 | 0.132 | ...................................................................... | 70 | 0.114 | ...................................................................... | 75 | 0.099 | ...................................................................... | 80 | 0.085 | ...................................................................... | 85 | 0.074 | ...................................................................... | 90 | 0.064 | ...................................................................... | 95 | 0.055 | ...................................................................... | 100 | 0.048 | 2...........................…........................................1
S 085-144
(11)
Disconnect the megohmmeter.
S 485-145
(12)
Connect a megohmmeter between the center contact of the detector loop B (DM216B or DM216C) to the detector element shell (ground).
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MAINTENANCE MANUAL
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(13) Apply 100 volts dc maximum and make sure the resistance is greater
than the minimum insulation resistance. ~.................................................................... | TEMPERATURE (DEGREES F) | MINIMUM INSULATION RESISTANCE (MEGOHMS)| ...................................................................... | 65 | 0.132 | ...................................................................... | 70 | 0.114 | ...................................................................... | 75 | 0.099 | ...................................................................... | 80 | 0.085 | ...................................................................... | 85 | 0.074 | ...................................................................... | 90 | 0.064 | ...................................................................... | 95 | 0.055 | ...................................................................... | 100 | 0.048 | 2...........................…........................................1
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