- Registered owner
- Four To One LLC
- Location
- Decatur, AL
- Owner type
- LLC
- Serial number
- 421C0073
- Year built
- 1976
- Type
- Fixed wing multi engine
- Engine
- Reciprocating
- Airworthiness
- Standard, normal
- Airworthiness date
- April 2, 1976
- Certificate issued
- July 16, 2022
- Expires
- July 31, 2029
- Mode S code
- A6FF17
From the FAA registry file of October 24, 2026.
On this page
Airworthiness directives that may apply · 33
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1972 | 2 |
|---|---|
| 1976 | 2 |
| 1977 | 1 |
| 1978 | 2 |
| 1980 | 3 |
| 1984 | 2 |
| 1986 | 1 |
| 1989 | 1 |
| 1990 | 1 |
| 1992 | 1 |
| 1994 | 1 |
| 1995 | 1 |
| 1996 | 1 |
| 1997 | 1 |
| 1998 | 3 |
| 2000 | 1 |
| 2001 | 1 |
| 2004 | 1 |
| 2005 | 3 |
| 2008 | 1 |
| 2016 | 2 |
| 2018 | 2 |
| 2023 | 2 |
See all 36 ADs
Information bulletins that may apply · 10
Advisory, not mandatory.
Airframe · Cessna 421C
SAIB CE-13-27R1Flight Controls Frayed Flap Extend CablesSAIB AIR-21-20TE FLAP CONTROL SYSTEM, Flight Controls –Flap Cable TensionSAIB CE-14-11R1Landing Gear; Nose Landing Gear TrunnionsSAIB CE-14-19Landing Gear; Main Landing Gear (MLG) Torque LinkSAIB CE-13-22Electrical Power System Circuit Breaker SwitchSAIB CE-11-29R1Flight Control SystemSAIB CE-10-01Fuel: Fuel Tank Selector Valve SystemsSAIB CE-03-17SAIB ACE-99-06SAIB ACE-99-05Historical bulletins · 2
NTSB investigations
No NTSB investigations matched to N55WSMatched by N-number and event date, checked against the reported serial number, make and model. Investigations from before this aircraft carried the mark are under Earlier aircraft. Investigations on Cessna 421C aircraft
FAA incident reports · 1
FAA accident and incident reports matched to this aircraft by N-number and event date, checked against the reported make and model.
Service difficulty reports
No reports matched to N55WSGeneral aviation reporting is voluntary. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Reports on Cessna 421C aircraft
STCs that may be installed · 258
Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do.
Airframe · Cessna 421C
STC SA02571SEInstallation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).STC SA01800SEFabrication and installation of new or replacement of existing instrument panel lights dimmer control.STC SA01861SEFabrication and installation of Landing Light Controller