A failed FAA Public ADS-B Performance Report (PAPR) does not necessarily mean your ADS-B equipment is defective. In many cases, the issue is related to system configuration, installation, or data being transmitted incorrectly rather than a hardware failure.

Common causes of a failed or unsatisfactory PAPR include:

• Incorrect aircraft registration (N-number) or Flight ID
• Improper ICAO 24-bit aircraft address programming
• Incorrect aircraft emitter category
• GPS position source or accuracy issues
• Transponder or ADS-B software configuration errors
• Altitude encoder discrepancies
• Wiring or installation problems
• Outdated software or firmware
• Intermittent antenna or RF performance issues

Many of these issues can be corrected without replacing the existing equipment.

Because the PAPR evaluates how your ADS-B Out system actually performed during flight, it is an excellent diagnostic tool for identifying configuration or installation issues that may not be apparent during normal ground testing.

If your report identifies one or more failures, the first step is to have the report reviewed by an experienced avionics technician. In many cases, the issue can be resolved through proper troubleshooting, software updates, or system reconfiguration.

Southeast Aerospace can assist with interpreting PAPR reports, diagnosing ADS-B performance issues, and recommending the most practical corrective action. If a system is approaching obsolescence or no longer cost-effective to maintain, we can also help evaluate modern ADS-B upgrade options that improve both compliance and situational awareness.

After any ADS-B installation, repair, software update, or configuration change, it's a good practice to request a new PAPR following a qualifying flight. Verifying your system's performance before your next trip can help prevent unexpected compliance issues and ensure your equipment is operating as intended.

The FAA's Public ADS-B Performance Report (PAPR) is a free online tool that evaluates how well your aircraft's ADS-B Out system is performing during an actual flight. After a qualifying flight, aircraft owners, operators, or maintenance personnel can request a report that identifies whether the ADS-B installation is transmitting data correctly and meeting FAA performance requirements.

For additional information:

https://adsbperformance.faa.gov/PAPRRequest.aspx

The Honeywell MST-70B was originally designed as a fit, form, and function replacement for the legacy Honeywell MST-67A Mode S transponder with the added capability of meeting ADS-B Out requirements when installed correctly.

While the MST-70B is a key component of an ADS-B compliant solution, the transponder alone does not guarantee compliance. Several additional factors must be considered to ensure the installation meets both regulatory and STC requirements.

Key items typically required for ADS-B compliance with the MST-70B include:

1. Approved GPS Position Source
ADS-B Out requires an approved GPS position source that meets the accuracy and integrity standards defined by an ADS-B mandate.

• The MST-70B does not contain an internal GPS so it must receive position data from an external, approved WAAS GPS such as the NXG-900.
• The GPS source must be specifically listed or approved for use with the MST-70B under the applicable STC.

2. Applicable STC or Approved Data

ADS-B compliance with the MST-70B must be accomplished under an approved Supplemental Type Certificate (STC) or other FAA-approved installation data.

• STC coverage varies by aircraft make and model.
• The STC defines approved GPS sources, antenna requirements, wiring configurations, and configuration settings.These are only two considerations among others such as proper antennas & cabling, correct configuration & aircraft data programming, and post-Installation ADS-B performance validation

The MST-70B was designed to simplify upgrades for operators replacing an MST-67A, however ADS-B compliance is a system-level requirement not just a transponder swap. Aircraft-specific approvals, GPS compatibility, installation quality, and configuration all play a critical role.

For this reason, Southeast Aerospace strongly recommends working with an experienced avionics shop familiar with Honeywell transponder installations and the applicable STCs to ensure proper and compliant installation.

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.