AD 47-11-02

final rule
Data completeness: 60%

Airworthiness Directives; Navion Models Equipped With Hartzell HC12x20-1 Propeller Hubs and 8628 Blades

AD Number
47-11-02
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft Sierra Hotel Aero, Inc. Navion (Army L-17A) Airworthiness Directives; Navion Models Equipped With Hartzell HC12x20-1 Propeller Hubs and 8628 Blades

Unsafe Condition

Hartzell HC12x20-1 propeller hubs and 8628 blades may exhibit excessive vibration leading to potential blade failure when installed on Navion models.

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

Required Actions

Reduce propeller diameter from 86 inches to 84 inches by cutting 1 inch from the tip of each 8628 blade to make 18428R blades. The rework must be performed by Hartzell factory or certified propeller repair agency.

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

Compliance Time

not later than May 1, 1947

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

Affected Aircraft

Sierra Hotel Aero, Inc. Navion (Army L-17A) models equipped with Hartzell HC12x20-1 propeller hubs and 8628 blades.

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

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

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