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Aircraft record

N5988M1972 Cessna 421B

Registration validUnclaimedSource: FAA, updated Oct 20, 2026

Safety record in brief:No NTSB accidents or incidents since 19827 ADs may apply2 service difficulty reports

Registration
Valid
expires Dec 31, 2032
Based in
Somerton, AZ
owner city / state
Engine
GTSIO-520-C · 340 hp
Cont Motor
Owners
1
since 2025
NTSB events
None
since 1982
ADs may apply
7
confirm with A&P
Service reports
2
since 1995

Registration

FAA Aircraft Registry · Oct 20, 2026
Registered owner
Individual owner
City, state
Somerton, AZ
Certificate issued
Dec 3, 2025
Expires
Dec 31, 2032
Airworthiness
Standard · Normal
Airworthiness date
Mar 22, 1972

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
421B
Year
1972
Serial number
421B0231
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
A7BE9B

Engine

Make and model
Cont Motor Gtsio-520-C
Type
Reciprocating
Power
340 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. 2025 – nowIndividual ownerSomerton, AZ · 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 (0)

No NTSB accidents or incidents found for this airframe since 1982.

Accident history for this model

ADs published since 1998 that may apply (7)

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
2023-05-16Reciprocating Engine Power SectionMar 15, 2023Engine (GTSIO-520-C)
2020-16-11Reciprocating Cylinder SectionSep 21, 2020Engine (GTSIO-520-C)Only with: Engines originally manufactured, rebuilt, or modified with a cross-flow cylinder assembly replacement on or after November 1, 2014, with cross-flow cylinder assembly P/N 658538, 658540, 658542, 658591, 658595, 658613, 658624, 658539, 658541, 658590, 658594, 658603, 658623, or 658630 installed.
2016-17-08Elevator Tab Control SystemSep 12, 2016Airframe (421B)
2007-05-15Teledyne Continental Motors GTSIO-520 Series Reciprocating EnginesApr 16, 2007Engine (GTSIO-520-C)
2005-20-25The Cessna Aircraft Company Models 401, 401A, 401B, 402, 402A, 402B, 402C, 404, 411…Nov 9, 2005Airframe (421B)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.
Show all 7 ADs
ADSubjectEffectiveApplies to
2000-01-16Cessna Aircraft Company 300 and 400 Series AirplanesFeb 15, 2000Airframe (421B)
98-04-28Cessna Aircraft Company Models T303, 310R, T310R, 335, 340A, 402B, 402C, 404, F406, 414…Mar 13, 1998Airframe (421B)

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

Service Difficulty Reports (2)

Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.

  • Reciprocating engine · cylinder head · crackedApr 27, 2004

    AIRCRAFT NDT SERVICE WAS CONTRACTED TO VERIFY CRACKS IN THE ENGINE CYLINDER HEADS BETWEEN THE SPARK PLUG AND FUEL INJECTOR MOUNTING BOSS. AN EDDY CURRENT EXAMINATION DETERMINED THAT ALL TWELVE CYLINDER HEADS WERE CRACKED. THE OPERATOR REPLACED ALL TWELVE CYLINDER HEADS WITH FRESH OVERHAULED HEADS.…

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Reciprocating engine · rod · departedFeb 24, 2001

    AIRCRAFT ARRIVED WITH RIGHT ENGINE OIL LEAK. FOUND OIL LINE TO BE LEAKING. REPAIRED OIL LINE AND SERVICED BACK UP WITH OIL. ENGINE WAS RERUN AND A ROD CAME LOOSE AND PENETRATED THE CRANKCASE. NO OTHER INFORMATION WAS RECEIVED, EXCEPT THAT THE ENGINE RAN OUT OF OIL DURING FLIGHT, WHICH PROBABLY…

    From FAA Service Difficulty Reports; matched by N-number and serial number.

Related aircraft

Show all 8 related aircraft
All 225 registered Cessna 421B aircraft

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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