AXP340 Transponder Installation Manual
10 March 2014
01201-00
Issue AF
AVIDYNE CORPORATION
Page 5
3.3 Installation Approval
The conditions and tests required for the TSO approval of the AXP340 Mode S Transponder are minimum
performance standards. It is the responsibility of those desiring to install this transponder on or within a
specific type or class of aircraft to determine that the aircraft operating conditions are within the TSO
standards. The transponder may be installed only if further evaluation by the user/installer documents an
acceptable installation that is approved by the appropriate airworthiness authority.
3.4 TSO Failure Condition Classification
The AXP340 Mode S Transponder has been designed to the major failure condition classification as
described by TSO C112d and C166b. Malfunction of the functions defined in paragraph 3.a of these TSO’s
are a major failure condition.
3.5 Non
– TSO Functions
The AXP340 Mode S Transponder contains the following non-TSO functions:
Stopwatch and Flight Timer. The transponder provides a simple stopwatch and flight timer
function, displayed on the front panel.
Altitude Monitor. The Altitude Monitor activates an audio annunciator or annunciator light
(depending on installation) when the aircraft pressure altitude differs from the previously selected
altitude by more than 200 feet.
Altitude Repeater. This is a serial altitude output that can connect to a GPS or other device needing
serial altitude data – this allows the transponder to act as a repeater for the altitude input instead of
requiring a second altitude encoder.
The operation of each of these functions is described later in this manual.
The non-TSO functions defined in this section are not part of the TSO approval. The non-TSO function data
included in this section is approved under 14 CFR 21.305(d).
