Looking at my pic of the CONDEC again you get a good view of the 'ducksbill' that featured in my story of the MSP hitting the a/c as it departed.
I was told that the 'ducksbill was where the Aircraft Data Recorder was supposed to have been fitted but never was. Would have really aided the investigation of the early crashes at least. I assume it was cost again.
Does the 'J' have one ?