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ECTM® Engine Condition Trend Monitoring
The accuracy of a trend analysis will depend on the
quality of the data input into the program. There is only one
flight configuration where engine reaction is predictable it
is the cruise condition. The following restrictions apply for
the data to be valid:
Record data once per day.
If a flight has more than one leg, select the one with the longest
cruise, and that is at a representative altitude and airspeed.
The trend will be more accurate, if the readings that are taking
from day to day remain with in the same altitude band (±
3000 ft.). There will of course be flights where this is not
possible.
Don’t write the altitude in flight levels. If the altimeter
indicates 24.020 ft. write that, not FL 240 (Record altitude
at 1013 mb / 29.92” Hg).
Always use Captains altimeter and speed indicator.
Set cruise power. Allow the engines to stabilise for 5 minutes,
without any power lever movement.
Do not adjust the power- or prop levers, to get nice identical
figures, before readings are made. This is called targeting
and will make the trend very inaccurate. It is separate engines,
they are not supposed to run identical.
The same flight configuration must be repeated (i.e. electrical
load, bleed air extraction).
Avoid reading mistakes (parallax errors), lean over so that
readings are made directly in front of the instruments, and
not from the side.
Get a decimal point reading when possible (don’t round
numbers).
The mechanic must remember to add maintenance codes, if there
has been performed work on the aircraft that can affect the
ECTM®.
To download the Cheklist Acrobat Reader is
requiered. In case you do not have Acrobat Reader installed
on your computer, please use the following link for a free download.
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