Turn and Slip Indicator 2 Minute Turn, Type MD-4A, MIL-I-7627A C-46 According to the Maintenance Interchangeability

According to the Maintenance Interchangeability gude dated Feb 1945

The manual covers instruments that were eventually used in aircraft of the Air Corps US Army and Air Force US Army during WWII

3in square

prompting a left/right turn towards the station

Turn and Slip Indicator 2 Minute Turn, Type MD-4A, MIL-I-7627A C-46 According to the Maintenance InterchangeabilityThis Turn and Slip Indicator Type MD 4A, MS28041, MIL I 7627A, 2 minute turn, was made by RC Allen. The case is open, and the internal mechanism can be removed to reveal the electrical gyroscope. Likely from the 1960s. It is in experienced condition given its age. The dial markings are clear and the glass is intact. Measures 2. 25inches diameter by ~5inches deep.