IFD540 Hardware Mods Primer

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There are a handful of hardware mods that have been made to the IFD540s since original cert.  Some folks are interested in knowing what those were and what their cut-in dates were/does their box contain the mods.

There are exceptions to the following summary (e.g. an IFD came in for service after original ship date and may have had a mod(s) applied, an IFD may have been held in production test for some reason and had delayed shipment and therefore a mod(s) applied prior to ship, etc) but in general, here are the mods and their cut-in serial number and ship dates:
OBS Calibration - S/N 1433xxxxx and later,  15 Sep 2014 ship date or later
DME Hardware Mod - S/N 1445xxxxx and later, 24 Nov 2014 ship date or later  (there are 12 exceptions)
Standby Com - S/N 1450xxxxx and later,  27 Jan 2015 ship date or later (there are 18 exceptions)
Since there were a number of exceptions (at least 30), if you really want to know what your unit has, supply your IFD(s) serial number and I can tell you exactly.
One more tip - when reading serial numbers, the first two digits are the calendar year of manufacture and the next two digits are the week in that year of manufacture.