Overspeeds - Garmin GI 275 Installation Manual

E.4

Overspeeds

E.4.1 Overspeeds Configuration
NOTE
If the POH/AFM defines multiple Vne points, and the last point defines Vne at the aircraft
operating ceiling, the POH/AFM defined points must be used to configure the GI 275.
NOTE
If the Vne is defined as varying with altitude, and the Vne at the operating ceiling is not
defined, then the last ALT/IAS point entered must be calculated at the aircraft's operating
ceiling as a linear line from the last ALT/IAS point. In all cases, the last point entered
must define Vne/Vmo at the operating ceiling.
If the aircraft has a designated Mmo and Mmo level, or is specified as having a Vne/Vmo that varies with
altitude, set the Vne/Vmo/Mmo selection to Variable and configure the GI 275 airspeed tape to the aircraft
specifications using the Enter Overspeeds button. If only the Mmo/Mmo Level or the variable Vne is
defined, then those fields that are undefined, respectively, should not be configured.
NOTE
The Enter Overspeeds button does not appear unless Vne/Vmo/Mmo Mode is set to
"Variable".
NOTE
When Overspeeds are configured, the GI 275 ADI will display a variable red overspeed
range similar to a barber pole.
The Mmo Value and Mmo Level fields define a minimum altitude where Mmo is a limiting factor on
performance. Above the Mmo Level, Mmo may define the start of the red overspeed range. The Vne/Vmo
altitude and IAS section defines limitations on IAS at specified altitudes. The first ALT/IAS point entered
will define Vne/Vmo at all altitudes below the altitude specified.
If Vne/Vmo is only defined once, then this single point should be entered with the ALT field being the
aircraft's operating ceiling.
However, if Vne/Vmo is defined as varying with altitude, then at least two points will be required – the last
two of which will define a linear line for all altitudes past the last point entered. As such, the last point
entered must define Vne/Vmo at the aircraft's operating ceiling.
These overspeed configurations must match the Type Data (POH/AFM) for the specific aircraft being
modified.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page E-6