Bailey Moyes 912 Dragonfly Maintenance Manual Download

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7.7

TachSen

Each tachometer input includes a sensitivity adjustment, identified as Tach1Sen and Tach2Sen on the
configuration set pages. The "L" (low) sensitivity setting is best for most tachometer connections as it
provides the greatest amount of filtering and tolerance of noise on the tachometer signal from the
engine. The "H" (high) sensitivity setting is best for connections to electronic ignition systems that
provide a 0-5V pulse output. Since less filtering is provided when the high sensitivity setting is used, it
should not be used unless required.

The tachometer input can tolerate signals of 200V or greater, regardless of the TachSen setting.

7.8

Peak – Leaning Function Sensitivity Adjustment

( Not Used for Dragonfly )

This entry serves as a sensitivity adjustment for the digital leaning functions. For a detailed description
of its use, refer to the section “Digital Leaning Page”.

7.9

Max Fuel – (Fuel Capacity Entry for Fuel Flow Option)

( Not Used for Dragonfly )

This entry is used by the fuel flow function to provide a simple means of resetting the fuel quantity to
the airplane’s usable fuel capacity. By pressing the left and center button together while on the FUEL
set page, it will be set to the entry made on this page.

7.10

Hours (Setting Hourmeter)

This function allows you to set the hour meter so that it matches the actual time on your engine. The
hour meter may be set to any value between 0 and 6553.5 hours. The hour meter will advance only
when the tachometer is above the TIM-RPM entry. It will reset to zero after 6553.5 hours.

7.11

Tim-RPM (Hourmeter & Flight Timer RPM Threshold)

This entry controls the RPM that will activate the Hourmeter and Flight Timer. While the engine RPM
displayed by the EIS is less than the entry on this page, the hourmeter and flight timer will not
advance. Setting this entry slightly above the power setting used for taxi will more accurately measure
the actual flying time, and will more closely match the tach time. Setting this entry to zero will allow
the hourmeter and flight timer to run whenever the engine is running.

7.12

AspdLo, AspdHi, TachLo, TachHi (Landing Checklist Reminder/RPM Range Limit)

( Not Used for Dragonfly )

These entries can be used to generate a landing checklist reminder, or as an alarm when operating
within a restricted RPM band. The landing checklist reminder is especially desirable in aircraft with
retractable landing gear, or for those of you like myself that just can't remember to perform a pre-
landing checklist. This is an excellent feature, and I encourage you to use it. It’s the kind of
automation that helps overcome the unreliability of the human pilot.

7.12.1

Landing Checklist Reminder

( Not Used for Dragonfly )

The landing checklist reminder function will generate an airspeed and/or tachometer warning when the
following condition is met.

a) The airspeed must exceed the AspdHi setting, and then go below the AspdLo setting. This will
generate an airspeed warning (the red warning light will flash, the page will change to the labeled
page that includes airspeed, and the airspeed will flash). (Of course, this requires that your instrument
includes the airspeed option.)