2-9. POWER PLANT LIMITS - ROLLS ROYCE MODEL 250-C20W
Takeoff power (5-minute limit): 61.7 psi torque; 810°C maximum
TOT.
Maximum continuous operation: 57.8 psi torque; 738°C maximum
TOT.
Maximum continuous N
1
RPM: 105%.
Maximum N
1
RPM during transient: 106% for 15 seconds.
N
1
idle speed: 59 to 65%
Limitations
Schweizer RSG, LLC.
Model 269D Helicopter
Pilot's Flight Manual
2-9
R
eissued: 16 Jan 2019
FAA Approved
Maximum N2 RPM: 97.4% transient overspeed 3 seconds
Maximum continuous N2 RPM:
Avoid engine N
2
steady-state operation 71%
to 88%. Operation within the speed
avoidance range is permitted for the preflight
checks specified in this flight manual.
Transient operation through the speed range
is to be accomplished as expediently as
possible. In autorotation, with N
2
split from
N
R
and the throttle in the GROUND IDLE
position, unrestricted operation within the
speed avoidance range is permitted.
Transient operation in the speed avoidance
range during recovery from autorotation is
permitted.
NOTE: Transient operation is defined as not
dwelling at any N
2
speed for more than
1 second.
CAUTION
Book 3.indd 57 8/4/19 1:25 PM
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