Pilot's Operating Handbook
Section 7
Description
Edition 0 - March 05, 2019
Rev. 1
Page 7.13.1
7.13 - Vacuum system and instruments
- see figure 7.13.1
The airplane is fitted with a vacuum system providing the suction necessary to operate
the cabin pressurization and the leading edge deicing.
Vacuum system includes :
-
A pressure regulator
-
An ejector
-
A regulating and relief valve
-
A pressure switch
Compressed air necessary for the ejector to create decompressed air is taken from
the powerplant. The air flow is regulated before going into the ejector which creates
necessary vacuum by venturi effect.
A relief valve fixed in cabin to frame C2, maintains the vacuum for pressurization
system. In case of pressure drop, a pressure switch, installed in the system, indicates
the failure by causing
VACUUM LOW
to light on.
Standby attitude module (MD302)
The Mid-Continent Instrument and Avionics MD302 Standby Attitude Module
consists of two LCD screens. The first screen displays the airplane attitude (pitch, roll
and magnetic heading) and the second screen displays the airplane altitude and
airspeed. The MD302 is powered from the ESSENTIAL BUS 2 or internal replaceable
battery ensuring that the airplane can continue safe flight and landing in the event of a
loss of primary attitude and air data displays. Pitot and static pressures are provided to
the MD302 solid state electronic sensors using the airplane pitot probe and static
sources.
The magnetic heading data is provided by MD32 magnetometer installed on the left
wing.
The standby attitude module is located in the top left hand corner of the instrument
panel.
PIM - DO NOT USE FOR FLIGHT OPERATIONS