NTSB History by Manufacturer & Model

See NTSB accident and incident counts for an aircraft manufacturer and model — combining FAA-registered aircraft with NTSB-only records for foreign-registered, military, and drone aircraft that never appear in the FAA's US civil registry. Counts only, not a rate or percentage — there's no reliable total fleet size for aircraft outside the FAA registry to compare against.

and, optionally,

54 NTSB records found for "PIPER AZTEC": 53 from FAA-registered aircraft, 1 from aircraft not in the FAA registry (foreign, military, or drone), 5 involving a fatality.