# AD 68-20-06: Rudder Horn Inspection

- Type: Airworthiness directive
- Status: Current
- Products: Sierra Hotel Aero Navion A (Army L-17B and L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, Navion H and Navion (Army L-17A)
- Effective: October 3, 1968
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-663
- Registered aircraft: 864 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/24BFF64F60748FC386256A5600702432.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/68-20-06

## The airworthiness directive

68-20-06 NAVION: Amendment 39-663. Applies to Navion through Navion H airplanes.

Compliance required within the next 50 hours time in service after the effective date of this AD, and each annual inspection thereafter.

To prevent failure of the Rudder Horn, P/N 145-24401, accomplish the following:

Inspect for horizontal cracks or corrosion in the edge of the rudder horn. These cracks would appear as delaminations or swelling under the paint. Replace corroded or cracked rudder horns with new or unused part of the same part number or Federal Aviation Administration approved equivalent part before further flight.

This amendment becomes effective October 3, 1968.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-782](https://openairdocs.org/tcds/A-782): Sierra Hotel Aero Inc.; names 8 of 8 models: Navion B, Navion H, Navion (Army L-17A), Navion F, Navion A (Army L-17B and L-17C), Navion D, Navion E, Navion G

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 864 (864 by airframe model, 0 by engine model)
- Makers: Ryan 359, North American 256, Navion 249

Models with the most aircraft:

- [North American NAVION](https://openairdocs.org/model/north-american-navion): 203 aircraft (airframe model)
- [Ryan NAVION](https://openairdocs.org/model/ryan-navion): 170 aircraft (airframe model)
- [Ryan NAVION A](https://openairdocs.org/model/ryan-navion-a): 115 aircraft (airframe model)
- [Navion NAVION A](https://openairdocs.org/model/navion-navion-a): 99 aircraft (airframe model)
- [Ryan NAVION B](https://openairdocs.org/model/ryan-navion-b): 68 aircraft (airframe model)
- [Navion NAVION G](https://openairdocs.org/model/navion-navion-g): 61 aircraft (airframe model)
- [North American NAVION A](https://openairdocs.org/model/north-american-navion-a): 46 aircraft (airframe model)
- [Navion NAVION B](https://openairdocs.org/model/navion-navion-b): 42 aircraft (airframe model)
- [Navion NAVION H](https://openairdocs.org/model/navion-navion-h): 36 aircraft (airframe model)
- [Navion NAVION F](https://openairdocs.org/model/navion-navion-f): 6 aircraft (airframe model)
- [Navion NAVION D](https://openairdocs.org/model/navion-navion-d): 5 aircraft (airframe model)
- [North American NAVION B](https://openairdocs.org/model/north-american-navion-b): 3 aircraft (airframe model)
- [Ryan NAVION G](https://openairdocs.org/model/ryan-navion-g): 3 aircraft (airframe model)
- [North American NAVION F](https://openairdocs.org/model/north-american-navion-f): 2 aircraft (airframe model)
- [Ryan NAVION D](https://openairdocs.org/model/ryan-navion-d): 2 aircraft (airframe model)
- [North American NAVION D](https://openairdocs.org/model/north-american-navion-d): 1 aircraft (airframe model)
- [North American NAVION G](https://openairdocs.org/model/north-american-navion-g): 1 aircraft (airframe model)
- [Ryan NAVION E](https://openairdocs.org/model/ryan-navion-e): 1 aircraft (airframe model)

All 19 models: https://openairdocs.org/ad/68-20-06/models.md
Every aircraft: https://openairdocs.org/ad/68-20-06/aircraft.md

Its text cites no advisory circulars or STCs.

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