AD 80-01-04

final rule
Data completeness: 70%

TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines

AD Number
80-01-04
Status
final_rule
Effective Date
Product Category
engine
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
engine Continental Motors IO-520-A TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-B TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-BA TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-BB TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-C TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-CB TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-D TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-E TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-F TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines
engine Continental Motors IO-520-J TELEDYNE CONTINENTAL MOTORS Model IO-520 and TSIO-520 Series Engines

Unsafe Condition

Failure of cylinder holddown flanges due to insufficient .050 inch minimum corner radius in the area spot faced for installation of holddown nuts on Airmotive Engineering Corporation rebarrelled cylinders (Part Numbers AE-C-631397 T.T., AE-C-639272 T.T., and AE-C-639274 T.T.).

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Inspect to determine if Airmotive Engineering Corporation rebarrelled cylinders with specified part numbers are installed. If installed, inspect cylinders for .050 inch minimum corner radius. Replace cylinders without proper radius.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

within the next 50 hours time in service after the effective date of this AD, unless already accomplished

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Continental IO-520 and TSIO-520 series engines incorporating cylinder assemblies rebarrelled by Airmotive Engineering Corporation

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

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View Official Source ↗ Find More ADs for Continental Motors IO-520-A

Related Airworthiness Directives

86-13-04 R3

final rule

TELEDYNE CONTINENTAL MOTORS (TCM) Models GTSIO-520-C, -D, -H, -K, -L, -M, -N; TSIO-520-AF, -BB, -BE, -B, -CE, -C, -E, -EB, -G, -H, -J, -K, -LB, -L, -M, -N, -NB, -P, -R, -T, -UB, -VB, -WB; IO-520-A, -B, -BA, -BB, -CB, -C, -D, -E, -F, -J, -K, -L, -MB, -M; IO-550-B, -C Engines

Unsafe Condition: Cylinder Assemblies

Effective: Feb 24, 1988 Category: appliance

81-24-06

final rule

TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines

Unsafe Condition: Engine Driven Fuel Pumps

Effective: Nov 23, 1981 Category: engine

77-13-22

final rule

TELEDYNE CONTINENTAL MOTORS Model IO-520-A, -B, -BA, -C, -D, -E, -F, -J, -K, -L, and -M; TSIO-520-B, -C, -D, -E, -G, -H, -J, -K, -L, and -N; GTSIO-520-C, -D, -F, and -H Engines

Unsafe Condition: Crankcase Cracks

Category: engine

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