FD_TEST - Flight testing gauges
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GroundRoll:
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Measuring of take-off and landing roll distances. The gauge
consists of a display with four lines.

Clicking into the 4th line (red field), you can select one of five
modes:

LIFT-OFF: The take-off distance readout (3rd line) freezes at the
moment the plane becomes airborne.

OBSTACLE: The take-off distance readout (3rd line) freezes at the
moment the radio altitude exceeds a given obstacle height which can
be selected by left-/right clicking into the 1st line (blue field).

AIRSPEED: The take-off distance readout (3rd line) freezes at the
moment the plane exceeds a given (indicated) airspeed which can
be selected by left-/right clicking into the 1st line (blue field).

TOUCHDOWN: The distance measuring starts at the moment the plane
is touching the runway and it freezes at the moment the plane has
stopped.

LANDING: The distance measuring starts at the moment the plane
altitude is below the obstacle height (blue field) and it freezes
at the moment the plane has stopped.

The first line (blue field) allows to set two different limiting
values: airspeed and an obstacle height which is used if the
corresponding mode is active.
The values can be increased-/decreased by right-/left clicking,
airspeed in one knot steps, obstacle height in one ft steps.
Obstacle height is initialized with 50ft, if gauge is loaded.

The second line is just a readout field which can't be clicked, it
shows (dependent on the selected mode) either the current airspeed,
radio altitude or simply displays "Flying" or "On Ground".

The third line shows the distance in feet the plane covered since
the measuring has begun. The distance is displayed in green font,
if the measuring is active or white if it is freezed. Clicking
into this line allows to activate the measurement or to freeze and
reset it.

Pitch:
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2-Needle Gauge indicating Pitch (blue needle) and AoA (red needle)
There are two limit bugs defining a minimum and maximum AoA. The
bugs are initialized with 10 degrees minimum and 16 degrees max
and can be adjusted using the two knobs.

The gauge works as follows: If AoA exceeds the max limit, the
airspeed (IAS) is displayed until AoA drops belows min limit
again.