Cessna 421C — Airworthiness Directives & records checklist
495 Cessna 421Cs are on the U.S. registry. Here’s what a records review covers for one — the Airworthiness Directives that apply, the known trouble spots, and the checklist a buyer or owner should hold every logbook against.
Airworthiness Directives that apply to the Cessna 421C
- one-timeAD 05-19928 — Airworthiness Directives; The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411, 411A, 414, 414A, 421, 421A, 421B, 421C, 425, and 441 Airplanes · 2005-10-12
The FAA adopts a new airworthiness directive (AD) for certain The Cessna Aircraft Company (Cessna) Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411, 411A, 414, 414A, 421, 421A, 421B, 421C, 425, and 441 airplanes equipped with certain avionics bus circuit breaker switches. …
- one-timeAD 92-16-18 — Airworthiness Directives; CESSNA Models 401, 402, 402A, 402B, 402C, 404, F406, 421, 421A, 421B, 421C, and 441 Airplanes · 1992-01-01
- one-timeAD 84-03-04 — Airworthiness Directives; Cessna Model 414A, 421C, and 425 Airplanes · 1984-01-01
- one-timeAD 80-20-06 — Airworthiness Directives; REGULATORY TEXT: 80-20-06 CESSNA: Amendment 39-3937. Applies to Model 421C airplanes (Serial Number 421C0401 and on) having King K · 1980-01-01
This is the applicability list. Which of these are complied with, their computed next-due dates, and the 31 serial/mod-conditional ADs that actually apply to your aircraft come from its digitized logbooks — that’s the verified report.
Known trouble spots on the 421C
Many Hartzell and McCauley constant-speed props carry blade-shank or hub ADs plus a calendar/hours overhaul interval; blade corrosion and hub grease leaks are common findings. Confirm the prop AD status and last overhaul against the interval.
Twin Cessnas carry recurring wing-spar (lower cap / spar-strap) inspections and a complex hydraulic landing gear with known actuator, saddle and door-sequencing wear. Confirm the spar AD/SID inspection status and the landing-gear rigging and function checks.
The records checklist for a Cessna 421C
Enter a tail number and Tailplate reads its logbooks against this list — every AD matched to compliance evidence, next-due dates computed, damage history pulled, and a records-adjusted value.
Look up a tail number →or see the free AD listApplicability is derived from the FAA directive corpus and the aircraft’s type certificate; it is advisory and not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.