INCH-POUND
MIL-PRF-25478D
06 May 2013
SUPERSEDING
MIL-PRF-25478C
29 December 1997
PERFORMANCE SPECIFICATION
COOLERS, LUBRICATING OIL, AIRCRAFT,
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments and Agencies of the
Department of Defense.
1. SCOPE
1.1 Scope. This is general specification for aircraft engine lubricating oil coolers that
provide oil temperature regulation for aircraft gas turbine engines using high temperature
synthetic base lubricating oil, and aircraft piston engines, turbo propeller gear boxes, and
helicopter transmission gear boxes using petroleum based oil.
1.2 Classification. Lubricating oil coolers (oil coolers) will be of the following types as
specified in the acquisition document (see 6.2).
1.2.1 Type. The type of oil coolers are as follows:
Type IA
-
Petroleum base lubricating oil cooler for aircraft piston engines and turbo
propeller gear boxes
Type IB
-
Petroleum base lubricating oil cooler for helicopters transmission gear
boxes.
Type II
-
Synthetic base lubricating oil cooler for aircraft gas turbine engines.
Comments, suggestions, or questions on this document should be addressed to Oklahoma City
Air Logistics Center/ENSDDA, 3001 Staff Drive, Tinker AFB, OK 73145 or emailed to
tinker.dsp@tinker.af.mil. Since contact information can change, you may want to verify the
currency of this address information using the ASSIST Online database at https://assist.dla.mil .
AMSC N/A
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