POWER PLANT INSPECTION,
REPAIR, AND TESTING
After completing this chapter, you will be able to:
Recognize the types of repairs accomplished
Identify the different types of test cells and
at the intermediate maintenance level.
Identify the repair limits for the intermediate
Recognize the purpose and entries on the
level of maintenance.
engine test log sheets.
Identify the different methods of cleaning and
marking engine parts.
The purpose of this chapter is to familiarize
different engines used in naval aviation, the
maintenance procedures in this chapter are
you with the types and authorized repair limits
general in nature. Components and repair
for intermediate maintenance activities (IMAs).
limits discussed are representative. Do not refer
Intermediate maintenance applies to those main-
to them when working on a specific engine or its
tenance functions normally performed in centrally
located facilities for support of the operating
units. The facilities are designated as aircraft
intermediate maintenance departments (AIMDs).
The primary purpose of the IMA is to
THREE-DEGREE GAS TURBINE
support and supplement the work of organiza-
ENGINE REPAIR PROGRAM
tional maintenance activities. Squadron personnel
assigned to the IMA, ashore or afloat, are
The Gas Turbine Engine Maintenance Pro-
assigned to perform the total work (within their
gram was formed under the three-degree concept
skills) of the intermediate activity and not just the
as specified in OPNAVINST 4790.2 (series).
work related to support of the squadron from
Under this concept, each engine's intermediate
which they were assigned.
maintenance manual defines specific engine
maintenance actions as either first-, second-,
The Gas Turbine Maintenance Program
or third-degree functions. These functions are
defines the repair functions of AIMD power
determined largely by degree of difficulty and
plants. Repair capabilities are different for each
particular engine and AIMD. It is important that
you become familiar with the repair capabilities
and functions of your intermediate maintenance
First-degree repair is the repair of a damaged
This chapter covers some of the procedures
or nonoperating gas turbine engine and its
and equipment used in an intermediate main-
tenance department. Because of the number of