TM 55–2835-208-23
1–31. FOREIGN OBJECT DAMAGE (FOD) INSPECTION
Inspect APU components during detailed applicable inspection tasks of Chapter 2.
1–32. HOT END INSPECTION ON CONDITION
Inspect hot end components (combustor housing, liner etc.) in accordance with the detailed inspection tasks of
Chapter 2.
1–33. OIL AND FUEL FILTER SERVICING
Servicing of the oil and fuel filter is limited to the replacement of the filter. Refer to applicable maintenance task
in Chapter 2 for detailed procedures.
1–34. OVERHAUL/RETIREMENT SCHEDULE
A
The maximum allowable operating time (MAOT) for the –100, –200 and –300 APU is 1000
hours or 3000 starts. The MCAT for the -201 and –300 APU is 6000 starts.
B
RETIREMENT SCHEDULE. The APU turbine wheel retirement life is 1000 hours or 3000
starts since last turbine wheel replacement for the –100, –200 and –300 APU. The –201 and
–302 APU turbine wheel retirement life is 6000 starts.
NOTE
The –300 and -302 engine are the only
engines with an hour meter and start
counter.
1–35. CORROSION INSPECTION
Technical inspector shall perform overall inspection of APU for corrosion. Corrosion is to be repaired by blend-
ing out pits with an abrasive pad. Refer to TM55–1520–237–23-5 for repair materials. If pits exceed 0.050
inch in depth APU requires depot repair. Refer to Glossary Section 2 for specific corrosion definitions.
Section X MAINTENANCE PROCEDURES
1–36. TESTING AND ADJUSTMENT
Testing and adjustment of the APU is accomplished with the APU installed in the aircraft, refer to
TM55-1520-237–T.
Change 5
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