from
http://www.atsb.gov.au/publications/...302820_001.pdf
The Robinson Helicopter Company - Model R22 Maintenance Manual contained a
section on life-limited components. The section contained a list of ‘fatigue life-limited’
parts that included the main rotor blades, part number A016-2. The table of parts and
their maximum service life was required to be approved by the US Federal Aviation
Authority as part of the continuing airworthiness requirements for the R22 helicopter.
The maximum service life listed for the A016-2 main rotor blade was 2,200 hours.
The same section also contained information on the time-in-service recording for the
helicopter. The section stated that: It is the operator’s responsibility to maintain accurate time-in-service records of the
airframe and life-limited components. An hourmeter activated by engine oil
pressure is standard equipment in the R22 helicopter and is an acceptable means of
recording time-in-service.
The section also contained the following information on the use of a collective hour
meter when recording time in service:The approved overhaul intervals and the fatigue service lives listed in the
Airworthiness Limitations Section are based on FAA Advisory Circular 20-95
which assume that 10.5% of the operating time will be in autorotation, runup, or
shutdown. Therefore, if an hourmeter activated by the collective control is used to
record the time-in-service, the values recorded must be multiplied by 1.12 when
determining replacement times for the life-limited components, engine and
airframe overhaul periods and other periodic inspection requirements.
this seems to be saying that maintenance should be 1.12 x collective time (or presumably engine time), is this still what it says?