GQM vs "Bestand und Bewegungsmeldungen"

[kalender1973]

Hello,

I have always interests if the “Bestand und Bewegungsmeldungen”(BBM) and GQM loss list are consistent and the data correlation between two lists is possible. As sample, I take an lost list from Martin Pegg’s “Hs 129” for year 1942(april-december) for II./SchG 1 and data for this unit from Michael Holm page. The result is some confusing for me. On the one hand, the loss summary is quite the same: 54 plane lost due Martin Pegg loss list (based as I assume on GQM list) and 56 plane lost due Holm’s page. But on the other hand, the monthly distribution is different. I could not found the month where the numbers from GQM and numbers from BBM are the same. The differences are sometimes high, e.g. april: due GQM 3 losses, due BBM no losses or june 8 losses due GQM vs 5 losses due BBM.

I am sure that for the other units and aircraft types I will have the same problem.

Could somebody explain this ?

Furthemore it looks for me that even the 15% plane damage caused, that plane must be withdraw from unit for external repair, otherwise the differences are even higher.

Best regards and thanks