In April 2006, Honeywell announced that the Sandisk flash card used in the database card for the MKXXI EGPWS was being replaced with a new flash card manufactured by Smart Modular Technologies.

This new database card will only work with MKXXI units with Mod or Service Bulletin 3 incorporated. This Service Bulletin consists of replacing the Processor Card Board in the unit.

As Honeywell considers this a product improvement, the cost to incorporate these mods is approximately $2500 and must be performed at the factory.