User manual

Page 92
Aircraft Operation Manual
Piper Cheyenne I, IA, II, IIXL
For ight simulation use only
Descent
During descent, a 3° descent angle is desired. To calculate the correct top of
descend, use this simple formula: Difference in ight level divided by 10 and
multiplied by 3 gives you the distance needed to establish a 3° descend angle.
The descent rate is calculated by ground speed (GS) * 5.
Example: You want to descent from FL260 to FL120, and your ground speed (GS)
is 250 kts. According to our formula we need 42nm for the descent (260 – 120 =
140. 140 / 10 x 3 = 42nm) with a sink rate of 1250 fpm (250 x 5 = 1250fpm).
In clean air you may want to accelerate your airspeed just below the red line
indicator which depicts the maximum allowed airspeed. Reduce power settings as
needed for the descent. When descend is established, select the aireld elevation
+500 feet on the cabin altitude controller, and monitor the pressurization gauges
for the cabin altitude to drop. As torque increases during descent, reduce power
further to stay within limits. No-smoking and seatbelt signs may be set as desired.
Also, turn ON the landing lights just before entering the approach phase.
Approach
During the approach phase you may have to follow a dened arrival and approach
procedure, or just get vectors to the nal by ATC. As it is likely that there is other
trafc around you, try to keep your speed high as long as practicable. Typical
airspeeds should be around 180 to 200 KIAS. Be advised that you need to reduce
speed before intercepting the ILS localizer and glideslope.
Maximum 180 KIAS to the localizer and maximum 160 KIAS to the glideslope are
typical values, unless ATC instructs you otherwise. High speeds on the GS are not
recommended, because for speed reduction you need to extend the aps and
the landing gear. Maximum speeds are around 170-180 KIAS for 15° aps and 150
KIAS for gear extension (check the limitation tables for precise values). As you
want to handle your plane gently, try to stay somewhat below these values.
According to above rules you may set the aps to 15° when the glideslope becomes
alive. Appropriate torque settings are around 450 ft-lb, just above the point where
automatic ignition is turned on. At 145 KIAS extend the landing gear and raise the
TQ to 500 ft-lb. This will give you a nal approach speed of125-130 KIAS.