Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
2 Set the published official airport altitude (such as shown on
flight charts) under the index arrow by turning the center
control knob.
3 Turn the index arrow of the rate control knob (lower left corner
of the control) to the 12 o’clock position (approx. 500 fpm).
These steps set the system to pressurize at approximately
700 feet above the runway after takeoff. The system will hold
this cabin altitude until the maximum differential altitude is
reached (see “Cabin Altitude with minimum Flight Level
Setting” line of
Figure 7-18) or a different cabin pressure is
selected.
4 After having cleared the airport area and established the climb
and being on course to the destination (see “a” on
Figure 7-18),
select the flight level corresponding to the intended cruise
altitude in the center dial and align that with the index arrow.
This alignment also indicates the approximate cabin altitude
(within approx. 700 feet) at the index on the larger numbers
marked “Airport Alt.”.
5 Increase or decrease the rate at which the cabin changes altitude
for the best comfort level from normal 500 fpm by turning the
rate knob counter clockwise for decrease or clockwise for
increase the rate.
It is usually the best to set the rate to reach the changed cabin
pressure (referenced from the Airport Alt.) slightly ahead of
reaching the cruising altitude (550 fpm in the sample of
Figure
7-18
). This selected altitude will be maintained until the aircraft
changes altitude sufficiently to reach the max. differential
pressure or descends sufficiently to go below the selected
airport altitude / cabin pressure.
6 When the aircraft reaches the proximity of the destination and
starts to descend (see “b” on
Figure 7-18), set the selector knob
to the published airport altitude.
7 Set the rate such that the selected airport altitude is reached in
the cabin prior to descending to that altitude (650 fpm in the
sample of
Figure 7-18).
When approaching the runway, the pressurization will cease
approximately 700 feet above the landing field prior to landing.
Should any slight pressure remain, the remainder will dump
when the squat switch makes contact. However, this is an
additionally safety device, because landing with cabin
pressurized is not allowed.
7-62 26. January 2011
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