51 THE SYSTEM IS OK.
 OPEN THESE CIRCUIT BREAKERS:
"APU CONT" ON PANEL 6-5 "APU GCU" ON PANEL P6
THEN, CLOSE THESE CIRCUIT BREAKERS:
"APU CONT" ON PANEL 6-5 "APU GCU" ON PANEL P6
APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100%
Figure 115A (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE ETC ú
 49-00-00
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 2)

FUEL SUPPLY SYSTEM TO THE APU IS THE FUEL FLOW SUFFI-(AMM 49-31-00/501).CIENT?  THE FUEL FEED SYSTEM FOR THE APU (AMM 28-22-00/101). 
YES 
(BLOCK 7) SEE SHEET 3 

APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100%
Figure 115A (Sheet 2)

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FROM SHEET 2 (BLOCK 6) NO

YES
SEE SHEET 4 (BLOCK 26)
APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100%
Figure 115A (Sheet 3)

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E05579
737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 3 (BLOCK 25)

DOES THE PROBLEM CONTINUE?

YES

27 REPLACE THE TEMPERATURE
SENSOR, T2, FOR THE COMPRESSOR
INLET (AMM 49-61-32/401).
DOES THE PROBLEM CONTINUE?
YES
YES

YES

NO
67 THE SYSTEM IS OK.
NO
YES

APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100% Figure 115A (Sheet 4)
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APU ENGINE HAS AN PREREQUISITES EXPLOSIVE "PUFF",
MAKE SURE THIS SYSTEM WILL OPERATE: "BANG" OR FLAME APU (AMM 49-11-00/201) DURING AN APU START
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)

POSSIBLE CAUSES:
1.
FUEL SOLENOID VALVE PROBLEM (AMM 49-31-31/401)

2.
FUEL CONTROL UNIT PROBLEM (AMM 49-31-11/401)

3.
COMBUSTOR UNIT PROBLEM (AMM 49-31-42/401)

4.
CLOGGED FUEL DRAIN FOR APU (AMM 49-31-71/601)

5.
CLOGGED APU SHROUD DRAINS (AMM 49-16-11/701)

6.
APU INTERNAL DAMAGE (AMM 49-11-00/401).

FAULT ISOLATION:
YES
YES

1 REMOVE THE FILTER ELEMENT
21 DISCARD THE FILTER ELEMENT
FOR THE OIL PUMP AND INSTALL A NEW OIL PUMP
(AMM 49-91-12/401). FILTER (AMM 49-91-12/401).

 EXAMINE THE FILTER ELEMENT START THE APU FOR METAL PARTICLES.(AMM 49-11-00/201) AND OPERATE DOES THE FILTER ELEMENT FOR 1 MINUTE.HAVE METAL PARTICLES? REMOVE THE FILTER ELEMENT FOR THE OIL PUMP

NO
(AMM 49-91-12/401). EXAMINE THE FILTER ELEMENT FOR METAL PARTICLES. DOES THE FILTER ELEMENTHAVE METAL PARTICLES?
NO
YES

2 INSTALL THE FILTER ELEMENT
FOR THE OIL PUMP
　
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