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 overhaul (TSO) was established. Cardex records for this unit indicate that following overhaul it was first installed in the No. 3 position on N 9742Z on January 14, 1963, with a TSO of 00 hours. The Cardex records further established that the unit was removed from N 9742Z on February 4, 1963, and was installed in the No. 3 position of N 189S with a TSO of 4.7 hours. There were no Cardex records entries for the unit from July 6, 1962 - January 14, 1963. However, an entry in the propeller logbook of aircraft N 9742Z indicates that the unit was installed in the No. 3 position of that aircraft on July 10, 1962. The records indicate that the TSO of this power unit from the date of installation on July 13, 1962, until its removal from N 9742Z on February 4, 1963, was 194.8 hours.

Additionally, the component overhaul time sheets in Standard's maintenance manual for N 9742Z, approved by the FAA on October 29, 1962, lists a power unit S/N 801 in the No. 3 position. TSO was shown as 411 hours, and approved overhaul time 2,500 hours.

Aircraft flight log entries relating to power unit S/N 165047 were examined and the following significant discrepancy write-ups on the unit were revealed: