MD Helicopters 369E, Rotorcraft Flight Manual

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Limitations
CSP − E − 1 ROTORCRAFT FLIGHT MANUAL
MD 500E
(Model 369E)
Revision 16
2 − 5
FAA Approved
2 − 7. POWERPLANT LIMITATIONS ROLLS ROYCE 250 − C20B
Engine torque limits:
Maximum takeoff (5 minute): 87.2 psi torque.
Maximum continuous:
81.3 psi torque with TOT at or below 738
°
C.
74.3 psi torque with TOT greater than 738
°
C.
Transient torque limits:
87.3 to 93.0 psi torque for 15 seconds at 103 percent N
2
.
93.1 to 97.6 psi torque for 3 seconds at 103 percent N
2
.
Turbine outlet temperature limits:
Maximum takeoff (5 minute): 810
°
C
Maximum for starting (lightoff): 150
°
C
Maximum continuous:
755
°
C with torque at or below 74.3 psi torque.
738
°
C with torque greater than 74.3 psi torque.
Transient limits:
During start and shutdown: 810
°
C and above for 10 seconds or less with
a momentary peak temperature of 927
°
C for not more than 1 second.
During power changes in flight: 810
°
C to 843
°
C for 6 seconds.
Gas producer (N
1
) speed limits:
Maximum continuous: 105%.
Minimum: ground idle speed 64%.
Transient limits:
106% for 15 seconds.
Power turbine (N
2
) speed avoid range:
Avoid steady state operations between 75% and 88%. Transition through the
speed avoid range is to be accomplished as quickly as possible.
Maximum allowable time in the speed avoid range is 1 minute.
NOTE
: Refer to Rolls − Royce CEB A − 1400.
CAUTION