T B M
850
SUPPLEMENT 65
MD302 STANDBY ATTITUDE MODULE
Edition 0 -- September 18, 2017
Rev. 0
Page 9.65.14
7.12 -- VACUUM SYSTEM AND INSTRUMENTS
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 the “VACUUM LOW” CAS
message 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 and roll) 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.
Compared to traditional standby instruments, the MD302 Standby attitude
module does not require suction from vacuum system to operate.
The standby attitude module is located in the top left hand corner of the
instrument panel.
PIM - DO NOT USE FOR FLIGHT OPERATIONS
Содержание TBM 850
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