The Aviation Aircraft Vertical Rate of Climb Indicator Type RCAL Canadian 6AA-74 is a reliable avionics accessory designed for Aviat aircraft. Manufactured by Canadian Aircraft Instrument & Accessories LTD., this instrument provides accurate vertical rate of climb measurements. With its compatibility with the specified make and model, this indicator ensures pilots have essential information for safe and efficient flights. Its manufacturer part number, Ref No. 6AA-74, allows for easy identification and installation in aircraft.