Owners of a popular brand of Mode S transponder must ensure they’re running the proper software. The FAA has issued an Airworthiness Directive for Garmin GTX 330 and 330D Mode S transponders after it was discovered that, under certain circumstances, they don’t always reply to the interrogation pulse of another aircraft. “The inaccurate replies could result in reduced vertical separation or unsafe TCAS resolution advisories,” the AD says. The fix is to install Software Upgrade Version 3.03, 3.04 or 3.05. The transponders are installed in hundreds of different types of aircraft.
Transponder AD Requires Software Upgrade
Key Takeaways:
- The FAA has issued an Airworthiness Directive (AD) for Garmin GTX 330 and 330D Mode S transponders.
- The AD addresses a fault where these transponders may not consistently reply to interrogation pulses from other aircraft.
- This inaccuracy could lead to reduced vertical separation or unsafe TCAS resolution advisories.
- Owners must install Software Upgrade Version 3.03, 3.04, or 3.05 to correct the issue.
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