Definition Of Terms; Operating Hours; Time Limits; Life Cycle - Rotax MML-912 Maintenance Manual

1) Definition of terms

1.1)

Operating hours

All of the maintenance intervals, such as the 100 hr. inspection and the
Definition
engine TBO, relate to the number of operating hours of the engine.
The operating hours are defined as follows in order to prevent misunder-
standings and to ensure safety:
- All time during which the engine is running is counted towards the total
- The time is counted irrespective of the load factor of the engine, such
NOTES:
- The planned inspections to be performed at certain intervals are based
1.2) Time limit
Time limits are predetermined time spans and intervals which are based
Definition
either on calendar intervals or the number of engine operating hours.
Once the time limits have been reached, the affected parts must either be
replaced for a general overhaul, or maintenance work must be per-
formed. These precautionary maintenance measures are designed to
avoid engine malfunctions or defects and ensure continued airworthiness
of the engine.
1.3)

Life cycle

The life cycle is always specified as an exact time span and is also
Definition
quoted in flight hours.
NOTES:
Effectivity: 912 Series
Edition 2 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
number of operating hours.
as idling or take-off power.
A mechanical hour meter is directly coupled to the engine
speed, the readings may deviate considerably from those
given by electronic remitters (e.g. TCU, FlyDat). Mainte-
nance and overhaul intervals are always dictated by the
readings of the electronic hour meter.
on experience from long test runs and field observations. They are
intended as precautionary maintenance measures in order to ensure
continued trouble-free operation of the engine.
Parts with a limited life cycle must be taken out of opera-
tion and overhauled if the specified time span or number
of flight hours is reached (whichever comes first).
05-10-00
page 3
October 01/2009