FAA Approved Airplane Flight Manual Supplement

190-00716-02 Rev. 3 Hawker Beechcraft King Air 300/300LW
Page 159 of 167
Displayed waypoint altitudes should remain constant. Because the compensation may originally be
computed when the aircraft is at a much higher altitude than the approach waypoint altitudes,
compensation of published waypoint altitudes on the active flight plan page is based on the temperature
reported at the field elevation (rather than using the measured static air temperature at the aircraft
altitude).
Rather than adjusting the measured altitude (displayed as uncompensated barometric altitude on the
altimeter), temperature compensation is applied to each published approach waypoint altitude shown in
the active flight plan. This includes approach waypoints in the initial, intermediate, final, and missed
approach segments. When the altimeter reaches the barometric altitude displayed in the active flight
plan for the waypoint, this geopotential altitude is the original published MSL altitude for the waypoint.
Only published approach waypoint altitudes shown on the active flight plan are temperature
compensated. No altitude outside a published approach procedure, no user entered altitude, and
no altitude shown as a flight level is temperature compensated.
Temperaturecompensationofpublishedwaypointaltitudesontheactiveflightplanpageisnot
dependentonuseofbarometricaltitudeforverticalguidanceonthefinalapproachsegment,andis
thereforeavailableforanytypeofapproach.Useoftemperaturecompensationtoadjustthevertical
deviationalongthefinalapproachsegmentanddisplayoftemperaturecompensatedwaypointaltitudes
ontheactiveflightplanpagearetwoseparatefeatures.Enablingthedisplayoftemperature
compensatedaltitudesontheactiveflightplanpageforpublishedapproachwaypointsisindependentof
usingtemperaturecompensatedaltitudetocomputeverticaldeviationalongthefinalapproach
segment.

Figure 20 - Temperature Compensation Pop-Up Page