Copyright of RotorSport UK Ltd
Document number RSUK0288
Page 14 of 55
SECTION 5
THE MAINTENANCE CHECK CYCLE
Check title
Content
Period
Check A
Check A
Prior to the first flight of the day
First 25 hour check
25 hour check items (one
time check, after new build)
Not exceeding 25 flying hours, or 1
year, whichever is the sooner
100 hour check
100 hour check items
Not exceeding 100 flying hours
Annual check
As 100hr check items.
Not exceeding 12 months from
previous 100hr or annual check (see
Note 5)
Use forms F175 25hr Service and F176 100hr Service/Annual Inspection Worksheets
PERMITTED VARIATIONS (see Notes)
Tasks controlled by flying hours
Maximum Variation
25 hour
+/- 5hrs
100 hour
+/- 10hrs
Tasks controlled by calendar time
Maximum Variation
6 months
1 month
Annual
Prior to Permit renewal
(see 5. and 6. below)
Tasks controlled by more than one limit
The more restrictive limit shall be applied
Notes
1. Permitted variations may not be applied to applicable airworthiness life limitations,
airworthiness directives or overhaul and test periods.
2. Permitted variations for tasks controlled by flying hours should not be understood to be
a maintenance planning tool, but as an exceptional means to allow the operator to fly for a
limited period of time until the required maintenance is performed.
3. Any application of a permitted variation to the maintenance check cycle period must be
recorded in the appropriate log book(s) together with the reason for the variation by a
person who is authorised to sign the log book entry for that particular check. Details of the
permitted variation must be made visible to the pilot.
4. Permitted variations are not required to be deducted from the next scheduled check.
5. The annual check may be anticipated by a maximum period of 62 days without loss of
the continuity of the maintenance check cycle. Thus, for example, where the full 62 days is
invoked, the following annual check would become due 14 months after the completion of
the annual check that was anticipated. The period by which the annual check was
anticipated and the date of the next annual check shall be recorded in the appropriate log
book(s).
6. Where the aircraft requires an annual inspection, and was supplied new within that
preceding year, it is permissible for the 25hr airframe inspection to be accepted in lieu of
the annual inspection, provided the service has been undertaken within the 62 days
requirement in note 5.
Page issue 2, dated 11.03.13
