Nr – The non SAS Ac are used extensively by the AAC and I have to admit we have crashed a fair few through tail rotor handling errors - the corrective actions for which, have been accurately described above. In the early days there were a few egotistical types who tried to baffle the rest of us with their wacky theories on ‘Fenestron stall’, I still remember standing in the hangar with about 20 other people while a certain prat waffled on about this and that and when he had finished, people started clapping! I couldn’t help thinking at the time; “This blokes talking b*ll*cks”. I got nice warm feeling a few weeks later when Boscombe Down stated that the so-called phenomena categorically did not exist.