
FAA Approved
Revision 5
5
−
33
CSP
−
HE/HS
−
1
Performance Data
MD 500
(Models 369HE/HS/HM)
ROTORCRAFT FLIGHT MANUAL
5
−
8. POWER CHECK CHART
−
ALLISON 250
−
C20 ENGINE
Description
The Power Check Chart shows the relationship of engine torque, turbine outlet
temperature, and horsepower at various conditions of pressure altitude and
OAT for an Allison 250−C20 engine producing specification power as installed in
the Model 500 helicopter. The primary purpose of this chart is its use as an
engine performance trending tool to aid in determining whether the engine is
producing specification power, or if engine power deterioration has occurred.
NOTE
Power check data taken at regular intervals should be plotted to monitor trends
in engine condition. See Allison 250
−
C20 Series Operation and Maintenance
Manual for additional information on trend analysis.
The power check chart is based on the following conditions:
103 percent N
2
.
Cabin heat and engine anti−ice OFF.
Particle separator SCAV AIR OFF.
30 amperes electrical load.
WARNING
Do not exceed engine/aircraft limits.
Accessories required for safe flight should be operated during
each check.
Maintain separation from objects in air or on the ground.
CAUTION
Reset altimeter if required after obtaining pressure altitude.
Use Of Chart:
The primary use of the chart is illustrated by the example below and by the
sample arrows shown on the chart. To determine power check values, it is nec-
essary to read and record engine TORQUE PRESSURE, TURBINE OUTLET
TEMPERATURE, PRESSURE ALTITUDE, and OAT while the helicopter is
flown in level flight at 103 percent N
2
.
Содержание MILVIZ MD530F
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