AD 68-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion A (Army L-17B and L-17C) | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion B | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion D | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion E | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion F | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion G | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion H | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Models Navion through Navion H Airplanes |
Unsafe Condition
Failure of the Rudder Horn, P/N 145-24401, due to horizontal cracks or corrosion in the edge, which may appear as delaminations or swelling under the paint.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for horizontal cracks or corrosion in the edge of the rudder horn. Replace corroded or cracked rudder horns with new or unused part of the same part number or FAA approved equivalent part before further flight.
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, and each annual inspection thereafter
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Navion Models Navion through Navion H Airplanes manufactured by Sierra Hotel Aero, Inc., including Navion A (Army L-17B and L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Rudder Horn Inspection
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_68-20-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-20-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Navion Models Navion through Navion H Airplanes Subject: Rudder Horn Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/03/1968 Make: Sierra Hotel Aero, Inc. Model: Navion A (Army L-17B and L-17C) | Navion B | Navion D | Navion E | Navion F | Navion G | Navion H | ...Show more Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 68-20-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-663 AD NUMBER: 68-20-06 SUBJECT HEADING: Airworthiness Directives; Navion Models Navion through Navion H Airplanes ACTION: SUMMARY: DATES: Effective October 3, 1968. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_68-20-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-20-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Navion Models Navion through Navion H Airplanes Subject: Rudder Horn Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/03/1968 Make: Sierra Hotel Aero, Inc. Model: Navion A (Army L-17B and L-17C) | Navion B | Navion D | Navion E | Navion F | Navion G | Navion H | ...Show more Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 68-20-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-663 AD NUMBER: 68-20-06 SUBJECT HEADING: Airworthiness Directives; Navion Models Navion through Navion H Airplanes ACTION: SUMMARY: DATES: Effective October 3, 1968. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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. FOOTER:
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.
Related Airworthiness Directives
2008-05-14 Recurring
final ruleAirworthiness Directives; Sierra Hotel Aero, Inc. Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H Airplanes
Unsafe Condition: Leaking or improperly operating fuel selector valves may disrupt fuel flow to the engine, leading to engine power loss.
62-03-03
final ruleAirworthiness Directives; Navion Models Navion, Navion A, Navion B, Navion D, Navion E, Navion F, and Navion G Aircraft
Unsafe Condition: The landing gear selector valve end fitting P/N 145-58145-3 (heat treated and non-heat treated) has a service history of failure during attempts to extend the gear.
49-05-03
final ruleAirworthiness Directives; Navion Airplanes Equipped With Continental Model E185-3 Engines Having Serial Numbers 4289-D to 5110-D Inclusive, and Engines Which Have Been Equipped at Overhaul With Tri-Metal Front Main Bearing Inserts and Bronze Thrust Washers in Accordance With Continental Bulletin No. M48-7.
Unsafe Condition: Unsatisfactory service experience with Continental E185-3 engines equipped with No. 530497 Tri-Metal front main bearing inserts and thrust washers/pins (Nos. 530494, 530495, 530544 and 530545 dowel...
49-12-02
final ruleAirworthiness Directives; NAVION All Airplanes Equipped With Romec Engine-Driven Fuel Pumps.
Unsafe Condition: A 1/16-inch hole in the 1/8-inch pipe plug of Romec engine-driven fuel pumps creates a fire hazard by allowing fuel to squirt into the generator and engine compartment in case of pump seal failure.
