TM 55-2835-208-23
Section IX PREVENTIVE MAINTENANCE
1-29. DROPPED ENGINE INSPECTION
Technical Inspector shall perform overall inspection of APU if it was dropped. Check for any broken, bent
or kinked tube assemblies, broken air inlet screen, dented combustor housing, damaged electrical harness/
connectors, damaged fuel manifold assembly and other obvious damage. Refer to DA PAM 738-751 for
applicable forms, records and worksheets.
CHECKS AND SERVICES
1-30. OIL CONTAMINATION INSPECTION
Technical Inspector shall refer to Table 1-2 for oil contamination criteria.
Table 1-2. Contamination Criteria
PARTICLE FORM
METAL TYPE
(NOTE 2)
DISPOSITION
Magnetic
Fuzz
Splinter or granular
Flakes smaller than
0.060 square inch
Flakes larger than
0.060 square inch
Nonmagnetic
Splinter or granular
Flakes smaller than
0.060 square inch
Flakes larger than
0.060 square inch
Change oil and filter (Task 1-28). Run APU,
refer to TM55-1520-237-T. Recheck
magnetic plug and oil filter. (Note 1).
Forward APU to Depot
Change oil and filter (Task 1-28). Run APU,
refer to TM55-1520-237-T. Recheck
magnetic plug and oil filter. (Note 1).
Forward APU to Depot
Forward APU to Depot
Change oil and filter (Task 1-28). Run APU,
refer to TM55-1520-237-T. Recheck
magnetic plug and oil filter. (Note 1).
Forward APU to Depot
NOTES:
1. If particles are found after test; forward APU to Depot
2. Definitions of particle forms:
Flake:
thin flat piece or layer
Fuzz:
light particles or fibers
Granular:
consisting of or appearing to consist of grains
Splinter:
thin piece or sliver split off lengthwise
1-34 Change 4
