REVUE THOMMEN AG
CH-4437 Waldenburg
AD20 Standby Altimeter
Page 19 of 72
07-Sep-2009 Document No: AD-INSOP-800 Revision: 1.6
2 Section II
2.1 General Information
This Section provides the description, the theory of operation and functional modes required to
understand and operate of AD20 Standby Altimeter unit. Refer to the following paragraph for the brief
description of the instrument. The AD20 Standby Altimeter belongs to the Solid State Flight
Instruments Family of REVUE THOMMEN AG.
2.2 Description
2.2.1 Instrument Description
The implementation of the AD20 Standby Altimeter provides measured barometric (corrected)
altitude. The static pressure is sensed by the integrated solid state pressure sensor and computed
internally. The instrument provides both dedicated digital liquid crystal display (LCD) and analog
pointer which features high intensity backlighting for daylight conditions. The altitude can be
displayed in both metric units as well as English (see section II, part 2, B.2.4).
It can be configured for different installations as per parameter upload via the RS232 serial
maintenance interface. The corrected Altitude is displayed in digital format on a high contrast LCD
and by a stepper motor driven pointer.
The extensive Built-In-Test (BIT) guarantees safe operation using watch dog circuitry on each power
on. The low power consumption and its low weight have been optimized for applications in state-of-
the-art avionics.
The REVUE THOMMEN AD20 Standby Altimeter is a simple designed modular unit and hence
having easy maintenance. By RS232 serial maintenance interface the AD20 Standby Altimeter can
be configured for different applications as per the aircraft requirements. Therefore its application
range reaches from Business Aviation up to Regional Aircraft, Transporters and Helicopters.
The REVUE THOMMEN AD20 Standby Altimeter meets or exceeds the requirements of ETSO/TSO-
C10b.
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