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Manual Number 9018233, Revision A
Mid-Continent Instruments and Avionics
December 22, 2014
2.5 MODIFICATIONS
Each model MD302 (part number 6420302-( )) has a nameplate that identifies the manufacturer, part
number, description, certifications and technical specifications of the unit. It also includes the “MOD” or
modification number representing notable changes in the hardware design of the unit. Software revisions
are reflected in the custom ARINC 429 output label 320. The following are descriptions of the current
modification releases of the MD302 Standby Attitude Module.
MOD 0
Modification (MOD) 0 is identified on the nameplate by the lack of marking on the MOD numbers 1
through 9 (i.e. 1-9 are visible).
Mod 0 is the initial release of the MD302 Standby Attitude Module.
MOD 1
Modification (MOD) 1 is identified on the nameplate by the marking/blacking out of MOD number 1 (i.e. 1
is not visible and 2-9 are visible see Figure 2.2 below for example).
Mod 1 of the MD302 Standby Attitude Module contains the following changes from MOD 0:
-
Added EMI gasket materials to back plate and battery cover.
-
Improved ESD protection.
-
Increased design margin of the ARINC RX/TX function.
FIGURE 2.2
NAMEPLATE AND MOD STATUS
MOD 0
MOD 1
