Although there is a User's Guide published by the FAA to accompany the Public ADS-B Performance Report (PAPR), I still have difficulty interpreting my PAPR reports. Obviously, any parameter flagged red on the report is a problem, but I'm not sure what the FAA considers a "pass" when the total report is taken into consideration. NOTE: I'm NOT discussing testing for purposes of claiming an ADS-B installation rebate, but rather whether I have a basically satisfactorily-performing ADS-B installation or not.
Here's a specific example: I recently installed an ADS-B "out" device and have received at least two totally clean PAPR's with 0 errors in all parameter boxes. OK, that's great, BUT subsequent to that, I recently had a short flight (14 minutes) with a "Missing Elements" NACv error red-flagged (which I understand to be a GPS velocity parameter). It indicated a "13.55% Max Fail" with the maximum duration of the error (Max dT) of 1 min 48 seconds and 110 maximum consecutive failures (McF). All other parameters in the report had 0 errors.
However, earlier in the same report, it reported under "Exceptions" that NACv was "No," which according to the User's Guide, "No=Pass."
The User's Guide is confusing because on page 7 it states that a NACv Exception is whether the "aircraft failed to meet the performance standards of the identified parameter: Yes=Fail, No=Pass." Then, on page 8, where the Guide discusses "Missing Elements," it says "Missing Elements will be highlighted in red if the aircraft fails to meet the Performance Requirements."
So, am I to interpret that since there is no NACv Exception, that overall, this is a satisfactory/passing report? Does this mean that although the NACv parameter had a significant % error, the percentage was relatively high because it was such a short flight and therefore, not really of concern?
I'm hoping there's someone out there who is very familiar with these reports and can comment. If anyone can point me to a "plain-language" explanation of the PAPR reports and the significance or not of the various parameters, I'd really appreciate it!
Here's a specific example: I recently installed an ADS-B "out" device and have received at least two totally clean PAPR's with 0 errors in all parameter boxes. OK, that's great, BUT subsequent to that, I recently had a short flight (14 minutes) with a "Missing Elements" NACv error red-flagged (which I understand to be a GPS velocity parameter). It indicated a "13.55% Max Fail" with the maximum duration of the error (Max dT) of 1 min 48 seconds and 110 maximum consecutive failures (McF). All other parameters in the report had 0 errors.
However, earlier in the same report, it reported under "Exceptions" that NACv was "No," which according to the User's Guide, "No=Pass."
The User's Guide is confusing because on page 7 it states that a NACv Exception is whether the "aircraft failed to meet the performance standards of the identified parameter: Yes=Fail, No=Pass." Then, on page 8, where the Guide discusses "Missing Elements," it says "Missing Elements will be highlighted in red if the aircraft fails to meet the Performance Requirements."
So, am I to interpret that since there is no NACv Exception, that overall, this is a satisfactory/passing report? Does this mean that although the NACv parameter had a significant % error, the percentage was relatively high because it was such a short flight and therefore, not really of concern?
I'm hoping there's someone out there who is very familiar with these reports and can comment. If anyone can point me to a "plain-language" explanation of the PAPR reports and the significance or not of the various parameters, I'd really appreciate it!
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