User's Manual

Airbus Iridium SATCOM System
165E5733-00 L-3 Aviation Recorders Proprietary
Issue, Rev. 02
21 January 2014
Page 49
 When any of the LGCIU discrete inputs are in the inactive state, the aircraft is considered as
‘in the air.
6.10.2 Function Assignment
The discrete inputs are software configurable. Once a function is selected for any given input, it is no
longer available for assignment to any of the other inputs. See Figure 6-7.
The ‘Mic On’, and ‘Call Light’ functions are used in conjunction with the Extension 1 audio interface
and are discussed in §6.12.1.1 below.
Discrete Input No. 1 (Din 1) is dedicated as a LGCIU input. Only Discrete Inputs Din 2 through Din 15
are software-configurable. Discrete Input No. 16 (Din 16) is dedicated as “aircraft on ground” (LGCIU
HPP).
None
When an input is not connected to an active system (e.g. no connection, or wiring provisions
only are installed), the input should be configured as “None.”
System Reset
The System Reset Discrete Input, when configured, will reset the system only after an inactive
to active transition. The system will reset only once even if the discrete input is left active. The
System Reset function is independent of the 'In-Air' or 'On-Ground' status of the aircraft.
Landing Gear Control Interface Unit 2 (LGCIU2)
A second Landing Gear Control Interface Unit input may optionally be provided to the AFIRS
system. Refer to §6.10.1 for the logic used when a ‘LGCIU2’ input is provided.