OPERATION
SECTION 3
3.1 GENERAL
The purpose of the AR850 Altitude Reporter is to establish a digital code
which is a direct function of aircraft altitude. Since the AR850 is TSO'd,
the parallel digital code is that set forth in the International (ICAO)
Standard code for SSR Pressure Altitude Transmission.
3.2 OPERATION
The AR850 is a remote mounted unit that is fully automatic in operation. The
companion transponder normally controls the operation of the AR850 by
automatically enabling or inhibiting its operation. It is in operation
(enabled) any time the transponder is set to the altitude (Mode C) mode of
operation. The information is inhibited (removed) any time the altitude mode
is turned OFF or to IDENT (MODE A).
When the transponder has internal circuitry designed to inhibit the
transmission of altitude information independent of the AR850, then the
AR850 may be permanently "enabled".
┌───────────────────────────────────────────────────────────────┐
│OPERATION NOTE: │
│ │
│ When power is applied to the AR850, the altitude encoding │
│ outputs are
inactive for approximately 3 minutes until the
│
│ sensor's heater temperature has reached minimum value. │
└───────────────────────────────────────────────────────────────┘
7/03 3-1
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