TM 55-2840-231-23
Section VIII. ENGINE TESTING IN MOBILE OR FIXED FACILITIES
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General
Preparation For Test
Instrumentation Requirements
Engine Testing
Engine Motoring Procedure
Engine Operating Procedures
Operating Limits
Test Requirements
Functional Test Schedule
Health Indicator Test (HIT)
Engine Performance Check
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1-63. GENERAL.
This section provides instructions for conducting functional tests following repair or replacement of parts.
1-64. PREPARATION FOR TEST. Engine testing may be accomplished with the engine installed in the
airframe AVUM or on a mobile engine test stand AVIM.
Engine Installation in Airframe. Install the engine in the airframe as outlined in the applicable aircraft
maintenance manual TM 55-1520-214-23 or TM 55-1520-228-23.
Engine Installation on Test Stand. Install the engine on the mobile engine test stand, part No. LTCT 10465-02
(NSN 4920-00-167-9178), as outlined in TM55-4920-328-13.
1-65. INSTRUMENTATION REQUIREMENTS. Engine testing may be accomplished using no more than
standard aircraft instrumentation to monitor the following parameters.
a. Turbine Outlet Temperature 0oC-1000oC)
b. Output Shaft Torque (0-110 psi).
c. Oil Pressure (0-150 psi).
d. Gas Producer (Nl) Speed (0-110%).
e. Power Turbine (N2) Speed (0-120%).
1-66. ENGINE TESTING.
1-67. ENGINE MOTORING PROCEDURE.
a. Engine installed in airframe.
(1) Disconnect the power input lead from the ignition exciter or pull the IGN ENG circuit braker (refer to
TM 55-1520-235-10).
(2) Insure that the throttle (twist grip) is in the FUEL CUTOFF position.
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