TO: ALL OWNERS, SENSENICH AND PIPER DISTRIBUTORS, PROPELLER REPAIR STATIONS

SUBJECT: REPLACEMENT OF SENSENICH M76AM-2 PROPELLERS INSTALLED ON 135 HP. LYCOMING O-29O-D2 ENGINES WITH THE MODEL M74DM

In view of recurring blade tip failures, it has became necessary to retire from service, as soon as possible, All M76AM-2 propellers which have been operated in a cut or nicked condition on the Lycoming O-290-D2 engine. Propellers which are undamaged and nick-free may be left in service for not more than 500 hours total flight time, provided continuous operation between 2450 and 2500 R.P.M. is avoided. A placard is being forwarded to each owner on record.

The M76AM-2 propeller should be replaced by a Model M74DM of the same pitch. It will be necessary also to replace the spinner with one of the type currently used an Piper 150 HP Tri-Pacers and Super Cubs.

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