18-16 Autorotational RPM Adjustment
Use the following procedure for checking and adjusting autorotational RPM:
WARNING
Failure to properly adjust autorotational RPM (RPM too low)
may prevent the rotorcraft from achieving proper RPM at low
gross weights.
1. Perform autorotation RPM check at minimum practical gross weight (less than 1900
lb). Calculate the takeoff gross weight of the helicopter. Record the time on the
hourmeter.
Take-Off gross weight:
Take-Off hourmeter reading:
2. Set the altimeter to 29.92” Hg (1013.2 millibars) prior to performing the autorotation.
Autorotate with the collective control firmly held against the down stop with an airspeed
of 50 KIAS.
WARNING
Do not allow the rotor to overspeed when performing autorotation
checks. Progressively lengthen both main rotor pitch link rod
ends until full down collective can be obtained without over-
speeding the rotor.
Take at least 3 RPM readings at 500 to 1000 foot altitude intervals.
Record the following in-flight data:
Test #
Hourmeter
Reading OAT
Pressure
Altitude
Test %
RPM
1
2
3
4
5
Page 18.12 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010
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