Re; My previous thread on the 6A/711 Mk.II Artificial Horizon. This has now been released to be included in the disposals.
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Apparently. it was chosen to be an alternative to the standard Sperry 1B; but seeing as how both the horizon bar and background plate moved independently; it confused the hell out of pilots who read it as though the the representation of the aircraft was fixed; as with normal artificial horizons. Consequently the instrument was quietly dropped in favour of the standard Mk1 Sperry, 6A-599, and/or Mk1B Sperry, 6A/1519.

Anyone interested? PM me.