The war diary (until September 1943) of this pilot is online on You Tube (
https://youtu.be/8-08qTJ1-M0) though only in german language.
In general it seems reasonable except for some passages for his time in JFS 5 and Ergänzungsjagdgruppe West which raise some questions.
One (in part 14) is the capture of a Sunderland flying boat flying from Cazeaux on 19.05.42
Kirchmayr´s plane was the only armed Bf.109, he led his 3 students for a Tieflugübung, when a flyingboat appeared with a small corcade at low-level; Kirchmayr managed to force the Sunderland off course with 2 second salvoes (3 times) from the left in front of the plane and showed the pilot to put his plane down on the water in Arcachon Bay, where boats of the KM „Schnellboot“ captured the crew and freight of weapons for the french resistance.
I found no RAF Sunderland loss for that date, nor an entry in the War diary of "Seekriegsleitung"
Does anyone have information about this incident?