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Learjet 25D - Differences

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DIFFERENCES
The two CJ610 engine configurations vary
generally in the gearbox and accessory area.
On the CJ610-1, power to drive the engine-
mounted accessories is extracted from the en-
gine through the power takeoff assembly. A
driver shaftgear is coupled to the aft end of the
compressor drive shaft by means of a spline
and contains six holes for venting the main
sump. The forward end of the driver shaftgear
is a bevel gear which engages with another bevel
gear mounted in the power takeoff housing per-
pendicular to the engine centerline. A radial
shaft, which is splined to the driver shaftgear,
transmits the power radially out of the engine
through the six o’clock mainframe strut. The out-
board end of this radial drive shaft is splined to
the transfer gearbox in the CJ610-1, and di-
rectly to the accessory gearbox in the CJ610-4,
-6 and -8 engines.
GE CJ610-1 and -4 engines are rated at 2,850
pounds of thrust. CJ610-6 and -8A engines
are rated at 2,950 pounds.
7-20
FOR TRAINING PURPOSES ONLY
LEARJET 20 SERIES PILOT TRAINING MANUAL
FlightSafety
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