The altitude hold
autopilot maintains the altitude of the vehicle as it performs a maneuver.
I quickly reset our AFCS and enabled altitude hold
during our momentary respite.
(The altitude hold
function of the AFCS will overshoot selected altitudes due to limitations on its control authority, especially with a low power setting and high rates of descent.)
The Century III autopilot controls displayed roll, heading and pitch functions in the "on" positions with altitude hold
is a great tool, but an instrument scan is imperative when there is no reference to the horizon.
Maj Neaderhiser turned the aircraft away from the target area, turned off the altitude hold
, set max range airspeed, and reduced the throttle setting in an attempt to lower engine temperatures.
If you get to MDA and want George back on the job, just select altitude hold
mode and he'll hold that MDA, even with the missed approach altitude in the preselector.
This includes selectable track, altitude hold
(and altitude preselect), vertical speed command, plus the ability to track GPS courses.
The two-axis autopilot aboard Kennedy's airplane had an altitude hold
mode, but it was not configured for climbs and descents to preselected altitudes.
I'd set the autopilot to "altitude hold
" and was getting prepared to tank on a KC-135, the Iron Maiden.
The autopilot was on altitude hold
, and all were comfortably confident that we were at a carefully computed safe altitude.