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Aircraft record

N21SG1976 Cessna 421C

Registration validUnclaimedSource: FAA, updated Oct 20, 2026

Safety record in brief:1 NTSB accident (substantial damage, Apr 2016)5 ADs may apply

Registration
Valid
expires Sep 30, 2028
Based in
Seattle, WA
owner city / state
Engine
GTSIO-520 SER · 435 hp
Cont Motor
Owners
1
since 2012
NTSB events
1
substantial, 2016
ADs may apply
5
confirm with A&P
Service reports
0
since 1995

Registration

FAA Aircraft Registry · Oct 20, 2026
Registered owner
Two One Sierra Golf LLC
Owner type
LLC
City, state
Seattle, WA
Certificate issued
Sep 18, 2012
Expires
Sep 30, 2028
Airworthiness
Standard · Normal
Airworthiness date
Apr 18, 1984

We never show street addresses, even though they appear in the public FAA file. Individual owners are shown by city and state only.

Airframe & engine

FAA Registry + type data

Airframe

Manufacturer
Cessna
Model
421C
Year
1976
Serial number
421C0039
Aircraft type
Fixed wing multi engine
Category
Land
Certification
Type Certificated
Seats
8
Engines
2
Max takeoff weight
Up to 12,499 lb
Mode S code
A1B8C0

Engine

Make and model
Cont Motor Gtsio-520 Ser
Type
Reciprocating
Power
435 hp

Total time and engine hours aren't public. They appear here once the owner adds logbooks.

Ownership history

Ownership history from FAA records
  1. 2012 – nowTwo One Sierra Golf LLCSeattle, WA · current

Individual owners are shown by city and state only.

Safety record

NTSB · Oct 15, 2026 · FAA ADs · Oct 20, 2026 · SDRs · Oct 16, 2026

NTSB events (1)

Accident · substantial damage

Apr 13, 2016 · Death Valley, CA

A runway overrun for reasons that could not be determined based on the available information.

Damage
Substantial
Injuries
None
Report
WPR16LA092

From NTSB records; matched by serial number.Read NTSB report (search CAROL for WPR16LA092)

Accident history for this model

ADs published since 1998 that may apply (5)

These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.

ADSubjectEffectiveApplies to
2016-17-08Elevator Tab Control SystemSep 12, 2016Airframe (421C)
2007-05-15Teledyne Continental Motors GTSIO-520 Series Reciprocating EnginesApr 16, 2007Engine (GTSIO-520 SER)
2005-20-25The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411…Nov 9, 2005Airframe (421C)Certain serial numbers: 401 655; 401 401-0001–401-0322; 401A 655; 401A 401A0001–401A0132; 401B 401B0001–401B0221; 402 402-0001–402-0322; …. Only with: Equipped with an avionics bus circuit breaker switch P/N CM3589-50, 593-250-101, 593-250-102, W31-X2M5A-50, or W31-X1000-50.
2000-01-16Cessna Aircraft Company 300 and 400 Series AirplanesFeb 15, 2000Airframe (421C)
98-04-28Cessna Aircraft Company Models T303, 310R, T310R, 335, 340A, 402B, 402C, 404, F406, 414…Mar 13, 1998Airframe (421C)

AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.

Service Difficulty Reports (0)

No Service Difficulty Reports found for this airframe since 1995.

Sources

  • FAA Aircraft RegistryRegistration, owner city and state, airframe, engineupdated Oct 20, 2026
  • NTSB accident and incident databaseAccidents and incidents since 1982updated Oct 15, 2026
  • FAA Airworthiness Directives (Federal Register)ADs published since 1998updated Oct 20, 2026
  • FAA Service Difficulty ReportsReports since 1995updated Oct 16, 2026

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