AD 47-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sierra Hotel Aero, Inc. | Navion (Army L-17A) | Airworthiness Directives; Navion Serial Numbers NAV-4-2 to NAV-4-550, Inclusive |
Unsafe Condition
The existing rudder-nose gear steering bellcrank, part number 145-34175, may fail due to inadequate design or material, leading to loss of steering control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the existing rudder-nose gear steering bellcrank part number 145-34175 and replace it with a new part of the same number provided by North American, which must be identified by a yellow dot and the stamp (SPL).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
To be accomplished immediately.
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) serial numbers NAV-4-2 to NAV-4-550, inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Rudder-Nose Gear Steering Bellcrank
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-11-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-11-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Navion Serial Numbers NAV-4-2 to NAV-4-550, Inclusive Subject: Rudder-Nose Gear Steering Bellcrank Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sierra Hotel Aero, Inc. Model: Navion (Army L-17A) Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-11-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-11-01 SUBJECT HEADING: Airworthiness Directives; Navion Serial Numbers NAV-4-2 to NAV-4-550, Inclusive ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-11-01 NAVION: (Was Mandatory Note 1 of AD-782-3.) Applies Only to Serial Numbers NAV-4-2 to NAV-4-550, Inclusive. To be accomplished immediately. Remove present rudder-nose gear steering bellcrank, P/N 145-34175 and replace with new part of the same number furnished by North American. The replacement part is to be identified by a yellow dot and the stamp (SPL). (North American Service Bulletin No. 21, dated January 23, 1947, covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-11-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-11-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Navion Serial Numbers NAV-4-2 to NAV-4-550, Inclusive Subject: Rudder-Nose Gear Steering Bellcrank Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sierra Hotel Aero, Inc. Model: Navion (Army L-17A) 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: 47-11-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-11-01 SUBJECT HEADING: Airworthiness Directives; Navion Serial Numbers NAV-4-2 to NAV-4-550, Inclusive ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-11-01 NAVION: (Was Mandatory Note 1 of AD-782-3.) Applies Only to Serial Numbers NAV-4-2 to NAV-4-550, Inclusive. To be accomplished immediately. Remove present rudder-nose gear steering bellcrank, P/N 145-34175 and replace with new part of the same number furnished by North American. The replacement part is to be identified by a yellow dot and the stamp (SPL). (North American Service Bulletin No. 21, dated January 23, 1947, covers this same subject.) 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.
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62-03-03
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47-31-03
final ruleAirworthiness Directives; Navion Serial Numbers NAV-4-2 Through NAV-4-1010 Which Incorporate Koehler Model 2250 Fuel Strainers
Unsafe Condition: Loss of fuel pressure due to air leakage into the fuel system through the CCA-1550-1/8 drain cock on the Koehler Model 2250 fuel strainer.
