TB 1-2835-208-20-2
6. Application.
a. Level of Maintenance. AVUM/AVIM.
b. Applied by. AVUM/AVIM.
c. Time Required. Not applicable.
d. Additional Information. These instructions are for use only in a sandy environment and/or during combat
operations.
7. Supply Kits, Parts, and Disposition.
a. Parts Required to Accomplished Technical Bulletin.
Nomenclature
Part Number
NSN
Barrier Filter
PSF31BH6X28
b. Parts Disposition. Not applicable.
c. Expendable Supplies. Not applicable.
8. Special Tools, Jigs and Fixtures Required. Not applicable.
9. Inspection Procedures.
NOTE
The T-62T-40-1 APU may be operated with the emergency barrier filter P/N PSF31BH6X28. The
barrier wrap filter shall be used to minimize engine sand ingestion in a heavy sand and dust
environment.
WARNING
Operating the APU with a clogged inlet filter can result in insufficient pressure across the APU
labyrinth seal. This will cause the seal to leak resulting in oil starvation of the APU bearings
and subsequent catastrophic failure of the unit.
a. Inspect the APU inlet screen for serviceability in accordance with TM 55-2835-208-23, Task 2-2.
NOTE
Pressure gradient across the barrier filter will cause an improperly installed (loose) screen to
collapse into the air inlet housing.
NOTE
Housing supports should be located at the 4, 8, and 12 o'clock positions.
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