N21SG is a 1976 Cessna 421C (fixed wing multi engine) with serial number 421C0039, registered in Seattle, WA. Its FAA registration is valid and runs until Sep 30, 2028; the renewal window opens on Mar 30, 2028. It is powered by a Cont Motor GTSIO-520 SER rated at 435 hp. Its airworthiness certificate is in the standard class (normal), issued Apr 18, 1984. It is one of 496 421C aircraft in the FAA registry, 3 of them registered in Washington. About 76% of them were built after it. The NTSB accident database lists one record for this airframe since 2008, the latest on Apr 13, 2016.
Registration
- FAA status
- Valid registration
- Expires
- Sep 30, 2028
- Registrant type
- LLC
- Registered owner
- TWO ONE SIERRA GOLF LLC
- Location
- Seattle, WA
- Local FAA office (FSDO)
- Seattle FSDO (SEA FSDO) · (206) 231-3828 or (800) 354-1940
- Certificate issued
- Sep 18, 2012
- Last FAA action
- Jun 10, 2023
- Mode S code (hex)
- A1B8C0
- Mode S code (octal)
- 50334300
- Official record
- registry.faa.gov
Aircraft
- Manufacturer
- CESSNA
- Model
- 421C
- Type certificate (TCDS)
- A7CE (Textron Aviation Inc.)
- Year manufactured
- 1976
- Serial number
- 421C0039
- Aircraft type
- Fixed wing multi engine
- Engine type
- Reciprocating
- Engine
- CONT MOTOR GTSIO-520 SER (435 hp)
- Engines / seats
- 2 / 8
- Weight class
- Up to 12,499 lb
- Airworthiness
- Standard since Apr 18, 1984
- Approved operations
- Normal
Public airports near Seattle
| Airport | ID | Distance | Tower | Fuel |
|---|---|---|---|---|
| Kenmore Air Seattle, WA | W55 | <1 mi | Non-towered | - |
| Seattle Seaplanes Seattle, WA | 0W0 | 1 mi | Non-towered | - |
| Boeing Fld/King County International Seattle, WA | KBFI | 7 mi | Towered | 100LL, A |
Straight-line distance from the registration city, from the FAA airport directory (NASR). The registry does not say where an aircraft is based.
NTSB accident and incident records
| Date | Place | Aircraft (as NTSB recorded it) | Damage | Highest injury | NTSB no. |
|---|---|---|---|---|---|
| Apr 13, 2016 | Death Valley, CA | Cessna 421C this airframe | Substantial | None | WPR16LA092 |
From the NTSB aviation accident database (events since 2008, data through Oct 28, 2026), matched by N-number. An N-number can move between aircraft, so each row is checked against the serial number on the current registration.