User manual
Page 63
Aircraft Operation Manual
Piper Cheyenne I, IA, II, IIXL
For ight simulation use only
The IAS HOLD mode is cancelled by selection of GO-AROUND, ALT HOLD, SPD
PRF, Glideslope capture or FLT DIR off.
SPEED PROFILE (SPD PRF) mode
The speed prole mode is used primarily in climb or descend. The pilot engages
SPEED PROFILE at the speed appropriate to his altitude at the time of engage-
ment. Or he adjusts to the appropriate speed for his altitude with the vertical
trim switch after engagement. The reference airspeed may be adjusted at a rate
of two knots per second by use of the Vertical Trim switch on the Mode Control-
ler.
Engagement will cause „SPD PRF” to be lighted on the Annunciator Panel and
activate the command bars on the FCI to call for pitch maneuvers necessary to
maintain the airspeed appropriate for the current altitude. If the autopilot is en-
gaged, the airspeed will be automatically adjusted by 1.3 KIAS per 1000 feet in
climb or descent.
PITCH ATTITUDE SELECTOR KNOB OPERATION
Depending on the selected autopilot mode, clicking the UP/DN position of the
PITCH ATTITUDE SELECTOR KNOB (1) produces the following results:
Pitch mode: +/- 0.5° pitch per click
IAS mode: +/- 1kt per click
SPD PRF mode: +/- 1kt per click
No mode: Trim adjust +/- 1. Equals pressing the 1 or 7 keys
on the numeric keypad