CR-MM-1-0-00
PS-28 Cruiser
PS-28N Cruiser
CHAPTER 12 – INSTRUMENTS AND AVIONICS
Date of issue: 2021-01-15
Revision No.: 25
12 - 9
12.2 Description and operation
12.2.1 Pitot-static system
The pitot-static tube for sensing static and total pressure is located under the left half of the
wing close to the rib No. 4. Total pressure is sensed through the hole in the pitot-tube face and
static pressure is sensed through the holes on the tube circumference. Pressure distribution
to individual instruments is performed by means of flexible plastic hoses (see Fig. 12-8).
Pitot-static tube for VFR Night airplane is equipped with heater element inside the tube. The
switch and indicator of heating are on Fig. 12-7.
Airplanes equipped with analog instruments:
Static pressure is lead to the ALT, ASI, VSI and altitude encoder. Total pressure is connected
to the ASI only.
Airplanes equipped with EFIS:
Static pressure is lead to the ALT, ASI and EFIS. Total pressure is connected to the ASI and
EFIS.
Airplanes equipped with Skyview:
Static and total pressure is lead to the ADAHRS, ALT, ASI and transponder. The drain sumps
are installed on the both flexible hoses.
Airplanes equipped with Skyview and Garmin G5:
Static and total pressure is lead to the ADAHRS, Garmin G5 and transponder. The drain
sumps are installed on the both flexible hoses.
Fig. 12-6
: Location of the pitot heat light and pitot heat switch
12.2.2 Stall warning system
The airplane can be optionally equipped with an vane–type lift detector. The lift detector is
located on the bottom of the left wing’s leading edge. Should the critical angle of attack be
approached (close to stall speed), the vane is actuated by the differences in pressures acting
on its front and the rear surfaces. Actuation of the vane triggers the stall warning system’s
electrical circuit. When the stall warning system is triggered, an audio alert is activated
(through the horn located behind the cabin) and the red
STALL WARNING
light (1, Fig. 12-7)
will illuminate on the left instrument panel. The audio and visual alerts will remain on
throughout the event.
1
PITOT HEAT
light
2
PITOT HEAT
switch
1
2
