CHAPTER 2
LM2500 GAS TURBINE ENGINE
As a gas turbine technician, you need to know
Allison 501-K17 GTE, which is covered in detail
the basic construction and function of the main
in chapter 3 of this TRAMAN.
propulsion power plant on your ship. The
The LM2500 GTE is manufactured by the
LM2500 GTE has been selected as the power plant
General Electric Company and is a marine
for the CG-, DD-, FFG-, and AOE-6-class
version of the engine used in a variety of aircraft.
ships. The greater your understanding of the
It is the main propulsion plant for many gas
construction of the engine, the better you will be
turbine-powered ships. The engine is rated at
able to operate and maintain the engine.
approximately 20,000 brake horsepower; it has
In chapter 1 of this TRAMAN you learned the
a power turbine speed (Np t) of 3,600 rpm on the
basic theory of how a GTE operates and the
CG-, DD-, and FFG-class ships and 3,253
variety of engine types available. In this chapter
rpm on the ship.
we will discuss the LM2500 GTE in particular
The gas turbine equipment is composed of a
since this engine is the one you will most often
base enclosure assembly and a gas turbine
work on. We will occasionally point out some
assembly. The gas turbine assembly (fig. 2-1) has
similarities between the LM2500 GTE and the
a GG, a PT, a high-speed flexible coupling shaft,
Figure 2-1.--Gas turbine assembly.
2-1
