CHAPTER 5
INSPECTIONS
5-10 Life-Limited Components
5-11 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. The collective-activated hourmeter may be used to determine
time in service for maintenance purposes, including time in service for all life-limited
components.
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 a life-limited replacement part or overhauled component is installed in the helicopter,
record the part name, part number, serial number, and previous time in service in the
aircraft maintenance record, including the installation date and helicopter total time.
Previous time in service must be included when calculating remaining component life or
time between overhaul (TBO).
CAUTION
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.
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.
5-12 Retirement Procedure
The FAA-approved Airworthiness Limitations section in Chapter 4 lists the mandatory
replacement time for affected components. Life-limited components must be removed
from the helicopter at specified intervals and permanently retired from service by destroying
or damaging each part beyond repair or beyond appearance of serviceable condition.
MAY 2015 Chapter 5 Inspections Page 5.1
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