This STILES STAN HATZ CB-1 airframe/engine combination has 8 current type-applicable Airworthiness Directives (0 airframe, 9 engine) and 1 historical. AD applicability is type-based — compliance status for N4257 must be verified against the aircraft maintenance logbooks.
Search FAA DRS for applicable ADs →N4257 is one of 1 STILES STAN HATZ CB-1 aircraft on the U.S. registry.
2 possible NTSB record matches for N4257 — see verification below.
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