Maintenance and Modifications
Ohio firm awaits STC for re-engined Citation IIs
Clifford Development expects STC approval this month for its re-engined version of the Citation II.

Clifford Development expects STC approval this month for its re-engined version of the Citation II. Certification of the S-II should follow within about 30 days.

Both STCs replace the airplane’s original Pratt & Whitney Canada JT15D engines with the fadec-controlled Williams FJ44-3A. The 3,000-pound-thrust Williams engine (derated to 2,820 pounds) is the same one currently in use on the CJ3, and it gives the older Citation improved performance and lower fuel burn.

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