Bailey Moyes 912 Dragonfly Maintenance Manual Download

Page: 111 / 191

Page

110

Max EGT-Inc

N/U [ 0 ]

Maximum Increase in EGT from the Lean Point. This alarm
is active while lean point is active. This alarm will often
generate a false alarm when the load on the engine
significantly reduced during descent. To avoid this false
alarm, reset the Lean Point. (Selecting “Set Lean Page” and
“Yes” activates alarm; “Reset” de-activates alarm.)

Set limit based on experience. A
small value will allow sensitive
detection of EGT increases,
which is useful for detection of
intermittent problems. Normal
operation may require a larger
setting to prevent false alarms
due to normal EGT fluctuation
caused by turbulence or other
small power/load fluctuations.

Max EGT-Dec

N/U [ 0 ]

Maximum Decrease in EGT from the Lean Point. See also
Max EGT-Inc description.

Set limit based on experience.
You may find that this limit is
significantly different from the
Max EGT-Inc. See also Max
EGT-Inc description.

Max Crate

N/U [ 0 ]

Maximum Cooling Rate for CHT – The alarm is provided in
degrees/minute, and corresponds to the maximum rate of
decrease in CHT. No limit applies to the maximum rate of
increase. All cylinders are checked for this limit.

Set limit based on engine
manufacturer’s recommendation.
If no limit is provided, establish a
limit based on experience.

Max CHT

[ 275 F ]

Maximum Cylinder Head Temperature. Often engines will
normally operate significantly lower than the engine
manufacturer’s limit. Consider setting this limit lower than
the maximum to get early warning of abnormal CHTs.

Set according to engine
manufacturer’s recommendation.

Min CHT

[ 150 F ]

Minimum Cylinder Head Temperature. Intended for engine
troubleshooting problems. Also useful as an “engine not
warmed up yet” reminder.

Set limit based on experience or
to zero if not used.

Display

[ 1 ]

Define which page number is your favorite. The instrument
will select this page at power-up, or when leaving the set
pages, after all alarms (if any) are acknowledged. This page
is also selected by double clicking the “Display” button. See
figure 2 for page numbering. This is a very useful feature. Be
sure to use it!

Set the your favorite page
number.

Contrast

– The contrast of the LCD display is set on this page. Four levels of contrast may be

selected, 0-3, with the lower settings best for higher ambient temperatures, and the higher settings best
for normal and cooler temperatures. Make your selection to achieve the most desirable appearance of
the display. It may be necessary to change it in response to large ambient temperature changes,
although this is rare. The contrast setting will automatically reset to level 2 at power-up if it is set
below level 2.

INSTALLATION

5.1

Mounting the Instrument – Position and other considerations

The first step in mounting the instrument is selection of a suitable location in the aircraft. The location
must be selected such that it is not exposed to water or fuel, and preferably away from other devices
that generate heat. The instrument does not generate electrical noise that will interfere with radios, nor
is it affected by transmissions from radios or engine ignition systems. It is not likely to affect a
magnetic compass.

The excellent readability making in non-critical as to where the instrument is mounted with respect to
the pilots eyes. The instrument uses an anti-glare window to minimize reflections. Of course the
instrument should be positioned to allow easy access to its front panel buttons.