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A16192
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 1)

YES NO

SEE SHEET 4 (BLOCK 8)
YES NO YES

2A DISCONNECT CONNECTOR D474
21 DO THE APU USUAL SHUTDOWN
FROM THE BLEED AIR VALVE, V56.(AMM 49-11-00/201).
START AND OPERATE THE APU EXAMINE THE CIRCUIT FROM
(AMM 49-11-00/201). THE BLEED AIR VALVE, V56,

WHEN THE APU ENGINE SPEED CONNECTOR D474, PIN A, TO THE IS 100%, DO A CHECK FOR ELECTRONIC SPEED SWITCH, S634,VOLTAGE AT THE BLEED AIR CONNECTOR D1245, PIN F VALVE, V56, CONNECTOR D474, (WDM 49-31-01). PIN A (WDM 49-31-01). IS THE CIRCUIT OK?

52 CONNECT CONNECTOR D474 TOTHE BLEED AIR VALVE, V56.
REPLACE THE ELECTRONIC SPEED SWITCH, S634 (AMM 49-61-22/401).
IF THE PROBLEM CONTINUES,REPLACE THE MISCELLANEOUSSWITCHING MODULE, M278 (AMM 52-71-31/401).
IS THERE 28V DC AT PIN A?
NO
YES

NO

3 DO THE APU USUAL SHUTDOWN
(AMM 49-11-00/201).
EXAMINE THE CIRCUIT FROM THE BLEED AIR VALVE, V56, CONNECTOR D474, PIN B, TO THE BLEED AIR SWITCH, CONNECTOR D646, PIN 13 (WDM 49-31-01).
 IS THE CIRCUIT OK?

YES YES
4 WARNING_______

55 DO THE APU USUAL SHUTDOWN
(AMM 49-11-00/201).
USE CARE WHEN YOU DO A CHECK TIGHTEN THE FITTINGS ORFOR AIR LEAKAGE. APU BLEED REPLACE THE LINES ASAIR IS HOT AND CAN CAUSE NECESSARY.
INJURY TO PERSONS.
START THE APU(AMM 49-11-00/201).
 DO A CHECK OF THE AIR LINES ON THE BLEED AIR VALVE FOR LEAKAGE.
IS THERE LEAKAGE FROM THE AIR LINES?

NO SEE SHEET 3
(BLOCK 5)

Bleed Load Cannot Be Applied When the APU Engine Speed Is 100 Percent
Figure 119 (Sheet 2)

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 4)
NO NO YES

22 DO A CHECK OF THE AIR LINE FROM THE BLEED AIR VALVE TO THE APU CONTROL THERMOSTAT.

 IS THERE LEAKAGE FROM THE YES AIR LINE?
NO

YES
6 DO A CHECK OF THE AIR LINE
FROM THE BLEED AIR VALVE TO
THE PROPORTIONAL CONTROL
VALVE.

IS THERE LEAKAGE FROM THE AIR LINE?

NO NO
YES
TIAL PRESSURE REGULATOR
(AMM 49-52-21/501).
 IS THE PRESSURE FROM THE

7 DO A TEST OF THE DIFFEREN-
NO
DIFFERENTIAL PRESSURE REGULA-TOR 18.5-19.5 PSIG (127.5-134.4 kPa)?

YES NO24 AIRPLANES WITHOUT THE ELECTRONIC TEMPERATURE CON-TROL;
59 CLEAN OR REPLACE THE FILTER FOR THE DIFFERENTIAL PRESSURE REGULATOR (AMM 49-52-21/301).

REPLACE THE APU CONTROL THER-MOSTAT (AMM 49-52-32/401).
AIRPLANES WITH THE ELECTRONIC TEMPERATURE CON-TROL; REPLACE THE PROPORTIONAL CON-TROL VALVE (AMM 49-52-31/401).
 DOES THE PROBLEM CONTINUE?

Bleed Load Cannot Be Applied When the APU Engine Speed Is 100 Percent
Figure 119 (Sheet 3)

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A11974
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 2)

THE NUTS, OR REPLACE THE BLEED
DO NOT OPERATE THE APU WITH
AIR VALVE, V56 (AMM 49-52-11/
THE LOWER SHROUD REMOVED IF
401), IF NECESSARY.
PERSONS ARE IN OR DIRECTLY BELOW THE APU COMPARTMENT. YOU MUST BE A MINIMUM OF 3 FEET AWAY FROM THE OUTER EDGE OF THE APU COMPARTMENT OPENING TO OPERATE THE APU WITH THE LOWER SHROUD REMOVED. AN APU TURBINE WHEEL SEPARA-TION DURING OPERATION CAN CAUSE INJURY TO PERSONS.
　
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