S634, CONNECTOR D1245, FROM
PINS C TO D, J TO M, K TO L
(WDM 49-31-01).
ARE THE RESISTANCES 0-1 OHMS (MAXIMUM)?
YES
SEE SHEET 2 (BLOCK 23)
Circuit Breaker on the APU Control Unit
Opens during the APU Operation
Figure 109 (Sheet 1)
A11973
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITH THE ELECTRONIC SPEED SWITCH ú
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FROM SHEET 1 (BLOCK 22)
YES
NO
23 MEASURE THE RESISTANCE AT
THE ELECTRONIC SPEED SWITCH,
S634, CONNECTOR D1245, FROM
PIN G TO PIN H (WDM 49-31-01).
IS THE RESISTANCE 4000-6000 OHMS?
YES
NO
24 MEASURE THE RESISTANCE AT
THE ELECTRONIC SPEED SWITCH,
S634, CONNECTOR D1245, FROM
PINS A TO G, M TO F, L TO E,
B TO G (WDM 49-31-01).
ARE THE RESISTANCES A MINIMUM OF 1000K OHMS?
YES
NO
25 MEASURE THE RESISTANCE AT
THE SEQUENCING PRESSURE SWITCH
FOR THE OIL, CONNECTOR D1250,
FROM PIN 3 TO PIN 4
(WDM 49-31-01).
IS THE RESISTANCE MORE THAN 1000K OHMS?
YES
NO
26 MEASURE THE RESISTANCE AT
THE FUEL SOLENOID VALVE,
CONNECTOR D1264, FROM PIN A TO
PIN B (WDM 49-31-01).
IS THE RESISTANCE 20-45 OHMS?
YES
NO
27 MEASURE THE RESISTANCE AT
THE SURGE BLEED VALVE,
CONNECTOR D1584, FROM PIN 1
TO PIN 2 (WDM 49-31-01).
IS THE RESISTANCE 25-60 OHMS?
YES
SEE SHEET 3 (BLOCK 27A)
Circuit Breaker on the APU Control Unit Opens during the APU Operation
Figure 109 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITH THE ELECTRONIC SPEED SWITCH ú
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ú 03 Page 125
ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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FROM SHEET 2 (BLOCK 27)
YES
NO
27A MEASURE THE RESISTANCE AT
THE 3-WAY SOLENOID VALVE,
CONNECTOR D1574, FROM PIN A
TO PIN B (WDM 49-31-01).
IS THE RESISTANCE 35-110 OHMS?
NO
YES
28 EXAMINE THE CIRCUIT FROM
THE ELECTRONIC SPEED SWITCH
(95% SWITCH; 110% SWITCH),
S634, CONNECTOR D1245,
PINS F,E, TO THE APU CONTROL
UNIT, M280 CONNECTOR D50B,
PINS 32,35 (WDM 49-31-01).
IS THERE A SHORT CIRCUIT?
NO
YES
29 EXAMINE THE CIRCUIT FROM
THE SEQUENCING PRESSURE SWITCH
FOR THE OIL TO THE APU CONTROL
UNIT, M280 (WDM 49-31-01).
IS THERE A SHORT CIRCUIT?
NO
YES
30 EXAMINE THE CIRCUIT FROM
THE FUEL SOLENOID VALVE TO
THE APU CONTROL UNIT, M280
(WDM 49-31-01; 49-41-01).
IS THERE A SHORT CIRCUIT?
NO
YES
31 EXAMINE THE CIRCUIT FROM
THE SURGE BLEED VALVE TO THE
APU CONTROL UNIT, M280
(WDM 49-31-01).
IS THERE A SHORT CIRCUIT?
NO YES
32 EXAMINE THE CIRCUIT FROM THE HOURMETER TO THE APU
CONTROL UNIT, M280
(WDM 49-31-01).
IS THERE A SHORT CIRCUIT?
NO
Circuit Breaker on the APU Control Unit
Opens during the APU Operation
Figure 109 (Sheet 3)
E05841
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITH THE ELECTRONIC SPEED SWITCH ú
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PART NUMBER 305593 ú
ú 02 Page 126
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