INTRODUCTION
This chapter describes the components and operation of the Learjet 45 powerplant. In
addition to the powerplant, engine-related sub-systems such as the oil, fuel, ignition,
engine controls and instrumentation, synchronization, and the thrust reverser system
are described.
The Learjet 45 is powered by two aft fuselage-
mounted TFE731-20R-1B or -20AR-1B tur-
bofan engines. The -20R and -20AR engines
have the same normal and APR thrust ratings
and the engines are interchangeable. The op-
erator will notice no difference in these en-
gines, but the -20AR does have extra
temperature margines. Hydraulically oper-
ated, target type thrust reversers are a standard
feature.
The TFE731 series engine is manufactured
by Honeywell International, Inc. The engine
is a lightweight, two-spool, geared front fan
engine.
Each engine develops 3,500 pounds of thrust,
static at Sea Level (S.L.), up to 88 degrees F
(+31 degrees C). Utilizing the automatic per-
formance reserve system, the engine will de-
velop 3,650 pounds of thrust, for the same
temperature conditions.
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