4-12 Fatigue Life-Limited Parts
The Airworthiness Limitations Section (ref. § 4-30) lists the mandatory replacement
schedule for fatigue life-limited parts.
If a part is fatigue life-limited or has a mandatory overhaul requirement and is interchanged
between an R44 and an R66 helicopter, and if the part life-limit or overhaul requirement
is different between an R44 and an R66 helicopter, the shorter life-limit or overhaul
requirement must be used. If a part is fatigue life-limited or has a mandatory overhaul
requirement, and the accumulated cycles and/or time in service are known but the
helicopter type is unknown, the shorter life-limit or overhaul requirement must be used.
Listed items (ref. § 4-30) must be removed from the helicopter at the specified intervals
and permanently retired from service, preferably by destroying or damaging each part so
it cannot inadvertently be returned to service.
4-20 Type Certificate Data Sheet (TCDS)
The Robinson R66 Type Certficate Data Sheet (TCDS) reprinted on the following pages is
subject to revision.
Visit the FAA Aircraft Certification Regulatory and Guidance Library to determine TCDS
revision status at: http://rgl.faa.gov.
Page 4.2 Chapter 4 Airworthiness Limitations JUL 2020
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