CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 201
Revision 35
04-00-00
FAA Approved
AIRWORTHINESS LIMITATIONS
MAINTENANCE PRACTICES
1. General
The Airworthiness Limitations Schedule gives
the mandatory replacement times for life-lim
ited components on MDHI Model 900 rotor
craft.
At the specified life-limit hours, components or
assemblies must be removed from the rotor
craft and permanently retired from service.
At the specified inspection interval, the
components or assemblies must be examined
with the instructions given in the Rotorcraft
Maintenance Manual (RMM) or applicable
component maintenance manual (CMM) or
engine manual (EM).
Components not listed in Table 201 have
on-condition inspections and maintenance
practices. The life of these components is more
than 20,000 hours.
2. Mandatory Replacement Time
The mandatory replacement time or life-limit
of a component of the rotorcraft is the maxi
mum number of permitted hours of operation.
Some rotorcraft assemblies and components
have a hourly life-limit established by MDHI
and approved by the FAA. The number of
hours assigned to different components varies
according to engineering fatigue tests, part
experience, etc.
For example, a component with an assigned
life of 1000 hours, may accumulate 1000 hours
of operation in service. Upon completion of the
1000 hours of operation, the useful life of the
component is ended. The components specified
in this section must be removed from the
rotorcraft at the number of hours indicated.
When a component with a life-limit or an
assembly that incorporates a component with
a life-limit is installed on a new or used
rotorcraft, the nomenclature, part number,
serial number and current rotorcraft hours
must be recorded in the Rotorcraft Log Book.
The remaining number of useful life hours for
the component with the life-limit denotes the
subsequent time at which the item must be
removed from the rotorcraft.
Destroy or conspicuously mark
components with a life-limit re
moved at retirement to prevent inadvertent
return to service.
If a component with a life-limit is part of an
assembly, the assembly must be removed from
the rotorcraft when the remaining number of
useful life hours for the component with the
life-limit expires. The assembly may be
overhauled and restored to maximum number
of hours of useful life by installing new
life-limited components plus all other parts
specified in the overhaul instructions (refer to
the applicable CMM).
3. Airworthiness Limitations Schedule
The schedule in Table 201 gives the mandato
ry replacement requirements.
The first column is the rotorcraft model the
mandatory replacement is applicable to.
The second column is the component
description.
The third column is the component part
number.
The fourth column is the component
life-limit.
CAUTION
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