Cessna 421C
N21SG is a Cessna 421C, a fixed-wing airplane with more than one motor with a piston engine, built in 1976. It has 8 seats. It is registered to Two One Sierra Golf LLC, an LLC in Seattle, Washington. The registration is valid: it was issued on September 18, 2012 and expires on September 30, 2028. It holds a standard airworthiness certificate for normal, dated April 18, 1984.
Aircraft
- Maker
- Cessna
- Model
- 421C · all 421Cs and related versions
- Serial number
- 421C0039
- Type
- Fixed-wing, multi-engine
- Power
- Piston (reciprocating), 2 motors · Cont Motor GTSIO-520 SER · 435 hp
- Seats
- 8
- Year built
- 1976
- Cruising speed
- 90 mph
- Transponder code
- A1B8C0 (octal 50334300)
Registration
- Status
- Valid registration
- Certificate issued
- September 18, 2012
- Expires
- September 30, 2028
- Last FAA action
- June 10, 2023
- Airworthiness
- Standard · Normal · April 18, 1984
- FAA region
- Northwest Mountain
- FAA record id
- 00970924
Owner as the FAA publishes it
- Name
- Two One Sierra Golf LLC
- Type
- LLC
- Address
- 3516 SW 110Th St
Seattle, WA 98146-1760
Owners can ask the FAA to withhold their name and address from public files. When they do, those fields are blank here as well. How that works.
Documents on file 0
No bills of sale, loans or other documents are indexed against this tail number.
Records check free · 2 to understand · 3 clear
The public federal record on N21SG, read the way a buyer, lender or insurer reads it: FAA registration, prior tail numbers keyed on the serial number, reuse of the tail number, recent registry filings, and the NTSB accident record under this and every earlier registration.
Valid registration to Two One Sierra Golf LLC, an LLC, certificate issued September 18, 2012, expires September 30, 2028. No fractional interest recorded. [1]
The airworthiness certificate on file is dated April 18, 1984, 8 years after the 1976 manufacture year. A re-issued certificate commonly follows export and re-import, a rebuild, or a return to the register after cancellation. The cause is documented in the FAA aircraft records file, which the full report obtains. [1]
No earlier tail number is recorded against serial 421C0039 for this model in the deregistered file. [2]
No other airframe has carried N21SG according to the deregistered file. [2]
No bills of sale, loans or releases have reached the registry in recent weeks. The index covers only recent filings; older liens are in the records file. [3]
1 NTSB record under N21SG: Accident on April 13, 2016 at Death Valley, CA: no injuries, substantial damage. Details below. [4]
These live in the FAA aircraft records file (every document ever filed against the aircraft) and, for larger aircraft, the International Registry. Part of the full report.
AD compliance against the logbooks and flight-activity reconciliation are researched layers of the full report.
NTSB records 1
Aircraft on the NTSB record: Cessna 421C · operated under 091
A runway overrun for reasons that could not be determined based on the available information.
Search the NTSB's CAROL system for WPR16LA092 for the docket and final report. Open CAROL
- FAA Releasable Aircraft Database, master file, file of October 2, 2026. registry.faa.gov/
- FAA deregistered aircraft file (part of the same download), file of October 2, 2026. registry.faa.gov/
- FAA document index: registry documents received in recent weeks, file of October 2, 2026. registry.faa.gov/
- NTSB aviation accident database (CAROL), records through August 27, 2026. data.ntsb.gov/carol-main-public/basic-search
This automated check reads the public federal record. Nothing here is a legal opinion, an appraisal or a statement about the aircraft's condition; a CLEAR line is a statement about the searched record, not the aircraft.
Source: FAA Civil Aviation Registry, Releasable Aircraft Database, October 2, 2026. See this record on the FAA site · This record as data