To: Aviation Dealers and GTX 330/330D Owners of Record
From: Bob Haase, Field Service Engineering Manager
Date: April 17, 2003

Dear Valued Garmin Customer,

Recently, Garmin became aware of an important issue relating to the GTX 330 and GTX 330D Mode S transponders. In certain conditions, an aircraft with an operating GTX 330/330D may not be visible to certain TCAS, TCAD and TAS systems. However, to the best of our knowledge, these Garmin products currently comply with all regulatory requirements relative to this issue. Garmin will shortly issue a mandatory Software Service Bulletin (SSB) #0304 which will facilitate field update of GTX 330/330D units to remedy the condition.

This message is intended to provide notification about this issue. We strongly urge incorporation of SSB #0304 as soon as it becomes available, which is expected to be on or about Friday, April 25, 2003.