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to make available to operations an aircraft, which is capable of performing as a minimum, one
additional sortie.
15. The term “Level of Maintenance” describes the depth of maintenance. “Line of
Maintenance” denotes the air maintenance organisation at which specific maintenance activities
are performed. These terms are linked to the Optimum Repair Level Analysis (ORLA) concept
and process, whose purpose is to optimise the overall economics of performing the total
maintenance function on specific aircraft weapon systems. There are three recognised levels of
aircraft weapons systems maintenance in the CF divided to accomplish the following:
a. Classification of preventative and corrective maintenance actions (including
modifications) according to scope, complexity, special knowledge and skills,
frequency, repair time and special tools, equipment or facilities required.
b. Forecasting of maintenance, repair pipeline requirements and turn-around times.
c. Determination of the overall economics of alternative repair policies (e.g., repair
versus scrapping), establishing maintenance capabilities and associated supply
support at various locations, and the selection of the optimum arrangement.
d. Estimation of maintenance labour hours and the determination of workforce
requirements.
e. Allocation of clear maintenance responsibilities to specific organisations so that
the total package will satisfy airworthiness and operational requirements while
making optimum use of resources, i.e., optimising maintenance for each aircraft
weapon system.
16. The three levels of maintenance for aircraft weapon systems are:
a. First Level. This is maintenance that is directly concerned with preparing aircraft
weapon systems for operations and keeping them in day-to-day order. First Level
maintenance is normally accomplished on-aircraft and consists of:
(1) aircraft servicing including ground handling, refuelling / de-fuelling, and
servicing level inspections;
(2) up loading / downloading of stores and role changing;
(3) on-aircraft fault diagnosis and simple corrective maintenance by
replacement or by adjustment (of parts, assemblies or components),
operational or functional checks;
(4) embodiment of simple modifications and the performance of special
inspections; and
Tactical Helicopter Operations
40 B-GA-440-000/AF-000
(5) record-keeping and reporting unique to First Level maintenance.
b. Second Level. Second Level maintenance is accomplished both on- and offaircraft
and consists of:
(1) aircraft Periodic and Supplementary Inspections and the resulting required
corrective maintenance by replacement of parts, assemblies or
components;
(2) on-aircraft fault diagnosis and corrective maintenance that is especially
time-consuming or complex;
(3) fault diagnosis, repair, test and inspection of aircraft equipment and related
components in maintenance shops;
(4) embodiment of prescribed modifications and carrying out of special
inspections;
(5) calibration of aircraft equipment and test equipment;
(6) maintenance of weapon systems software; and
(7) record keeping and reporting unique to Second Level maintenance.
c. Third Level. Third Level Maintenance usually involves prolonged aircraft
downtime or off-aircraft work, and is normally more complex than First and
Second Level maintenance. Further guidance on the Third Level of maintenance
is provided in CFAO 36-45, Third Line Maintenance of Material.
17. The number of maintenance lines will depend on the situation, but there are normally
three lines of maintenance organisation for aircraft weapon systems. Assuming maximum
aircrew for first level maintenance activities, tactical helicopter squadrons are established to
conduct first and second line maintenance. The three lines of maintenance are defined as
follows:
a. First Line. Aircrew are responsible to conduct First Level maintenance activities.
Depending on flexibility requirements and availability of resources, higher levels
of maintenance may be assigned to First Line. All tactical helicopter squadrons’
conduct first line maintenance. First line maintenance activities include:
(1) aircraft ground handling;
(2) loading and unloading of stores and air weapons;
(3) scheduled inspections; (e.g. 25hr, 100hr)
(4) record keeping particular to first level maintenance;
(5) refuelling/defuelling; and
Sustainment
B-GA-440-000/AF-000 41
(6) routine pre-flight and post-flight servicing and inspections.
b. The co-ordination of scheduled flying and the
supporting maintenance activity must be a
continuous process between squadron operations
　
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