Kelly MFG RCA41
RC Allen RCA41-11A is a 3-inch percent tachometer (0–110 % RPM), P/N 100-0034-25, driven by a remote two-pole tach generator to MIL-G-9398. It weighs 1.4 lb and connects through an MS3106-10SL-3S connector.
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- RCA41-11A
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RC Allen RCA41-11A is a 3-inch percent tachometer made by Kelly Manufacturing Company, P/N 100-0034-25. It indicates engine speed from 0 to 110 % RPM with a large pointer and a small pointer that reads in 1 % increments on a 360° dial. The instrument is driven by a remote two-pole tach generator conforming to MIL-G-9398, which powers its three-phase AC synchronous motor.
The case is 3 in in diameter and at most 5 in (127 mm) long, and the instrument weighs 1.4 lb (0.64 kg). It connects through an MS3106-10SL-3S connector and carries NSN 6680-00-944-3117. The RCA41-11 (P/N 100-0034-24) is the same tachometer without a bezel. In an EASA aircraft, the installation follows approved data for the type and ends with a Certificate of Release to Service. Fit depends on the aircraft type and the P/N of the installed indicator.
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