This BELL 47D1 airframe/engine combination has 123 current type-applicable Airworthiness Directives (117 airframe, 9 engine) and 3 historical. AD applicability is type-based — compliance status for N9421H must be verified against the aircraft maintenance logbooks.
Search FAA DRS for applicable ADs →N9421H is one of 52 BELL 47D1 aircraft on the U.S. registry · fleet median year 1951.
6 possible NTSB record matches for N9421H — see verification below.
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