The U.S. aircraft register, updated daily
Engines · piston (reciprocating) · data as of October 5, 2026

Continental GTSIO-520-M

6 aircraft on the U.S. register carry a Continental GTSIO-520-M engine, rated at about 375 horsepower. The Cessna 404 is the model most often fitted with it (5 aircraft). The aircraft carrying it were built between 1977 and 2007.

The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Continental GTSIO-520-M. FAA spelling: GTSIO-520-M.

Fitted to model families

Cessna 4045Mooney M-201

Cessna 404 · Mooney M-20

Where they are owner's state

Utah2Montana2Michigan1Kansas1

Kind of aircraft

Piston twins5 (83%)Piston singles1 (17%)

When the aircraft were built by decade

012233197012000

What the FAA has certified, ordered and been told about the Continental GTSIO-520-M the component layer

The design is held under 1 type certificate (E7CE, held by Continental Aerospace Technologies, INC.). The FAA has issued 25 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 157 failure reports with the FAA since 1995, 7 of them in the last ten years.

FAA orders 25 airworthiness directives · newest first

2023-03-152023-05-16 · Reciprocating Engine Power Section · engine
2023-02-232023-04-08 · Reciprocating Engine Power Section · engine
2023-02-172023-02-12 · Engine Air Intake System · engine
2022-08-152022-16-03 · Engine (RECIPROCATING) · engine
2020-09-212020-16-11 · SUMMARY: Reciprocating Cylinder Section · engine
2016-09-152016-16-12 · Cylinder assemblies · engine

All orders naming the Continental GTSIO-520-M

Failure reports 157 since · what operators and shops told the FAA

0510162195000512219

Parts most often reported as the reports name them

Bearing13Crankcase9Cylinder8Shaft7Stud7Connecting Rod6Pump6Adapter4Bracket4Engine4

Latest reports

2019-11-14Engine: failed
2019-06-15Case: cracked
2017-04-03Cylinder: damaged
2014-05-06Hose: deteriorated
2014-04-03Clutch: failed

Certificates and bulletins

E7CEType certificate held by Continental Aerospace Technologies, INC. · 10 models listed · revised February 23, 2023

Safety bulletins 6 · advice, not orders

2018-06-20NE-18-16 · POWERPLANT Alternator Drive Coupling
2016-03-08NE-16-13 · Powerplant - Prohibited use of sealant
2013-02-08NE-13-15 · Engine Controls: Continental Motors, Inc. (CMI) Throttle and Mixture Control Levers
2012-10-31NE-13-04 · Continental Motors, Inc. (CMI) Connecting Rod Piston Pin Bushing Inspection
2009-11-20NE-10-09 · Reciprocating Engine Power Section: Hydraulic Valve Lifters

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.

Connections how this engine series links to the rest of the register

Fitted to
Where they are
Biggest operators
Airworthiness

These connections as data: /graph/engine/continental-gtsio-520-m.json · about the eFlight graph.

Aircraft newest certificates first · 6

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N404CR Cessna
404
Fixed-wing, multi-engine Tvpx Aircraft Solutions INC Trustee
North Salt Lake, Utah
Standard 2025-05-21 ValidFAA registration status code V: Valid registration. All codes
N608RC Cessna
404
Fixed-wing, multi-engine Richland Aviation INC
Sidney, Montana
Standard 2023-01-20 ValidFAA registration status code V: Valid registration. All codes
N475RC Cessna
404
Fixed-wing, multi-engine Tvpx Aircraft Solutions INC Trustee
North Salt Lake, Utah
Standard 2021-06-05 ValidFAA registration status code V: Valid registration. All codes
N575RC Cessna
404
Fixed-wing, multi-engine Richland Aviation INC
Sidney, Montana
Standard 2015-01-22 ValidFAA registration status code V: Valid registration. All codes
N835RC Cessna
404
Fixed-wing, multi-engine Dodson International Parts INC
Rantoul, Kansas
Standard 2014-11-17 ValidFAA registration status code V: Valid registration. All codes
N12SN Mooney Airplane Co Inc
M20TN
Fixed-wing, single engine Nechvatal Equipment Leasing LLC
Grand Blanc, Michigan
Standard 2007-03-15 ValidFAA registration status code V: Valid registration. All codes

Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.