CHAPTER 4
AIRWORTHINESS LIMITATIONS
4-10 Life-Limited Components
4-11 Time-In-Service Records
It is the operator’s responsibility to maintain a record of time in service for the engine,
airframe, and all life-limited components, as well as the number of start cycles for the
engine. Two hourmeters are provided: the hourmeter on the console records all run
time including ground idle and is provided for reference. The hourmeter located outboard
of the pilot's seat is collective-activated and records run time only when the collective
is raised off the down stop. Both hourmeters are connected to main rotor gearbox oil-
pressure switch. The collective-activated hourmeter may be used to determine time in
service for maintenance purposes, including time in service for all life-limited components.
Calendar time in service for the airframe and engine begins on the date of the original RHC-
issued Export (or Standard) Certificate of Airworthiness for the helicopter. For spares
without a storage limit specified in § 10-20, calendar time in service begins on the date
of the RHC-issued Airworthiness Approval Tag (Authorized Release Certificate) issued
with the invoice.
If a component or an inspection is scheduled for hourly and calendar intervals, comply
with whichever requirement comes first, then reset interval unless otherwise specified.
Engine life is limited by engine time in service and accumulated start cycles. The engine
is equipped with an electronic Engine Monitoring Unit (EMU), which may be used to verify
time in service and accumulated start cycles. An official, independent record of start
cycles must be maintained by the operator.
When installing a life-limited part or a part with an overhaul requirement, record in the
helicopter maintenance record the installation date, part number, part name, serial number,
helicopter total time, and time in service accumulated by part since new or since last
overhaul, as applicable.
WARNING
Components with mandatory overhaul times or life-limits whose
time in service is not reliably documented cannot be considered
airworthy and must be removed from service.
JUL 2020 Chapter 4 Airworthiness Limitations Page 4.1
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