AD 73-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Alexandria Aircraft, LLC | 17-30A | Airworthiness Directives; Bellanca Model 17-30A Airplanes |
Unsafe Condition
Bolt failures and subsequent washer ingestion into the engine due to AN4H-17A bolts attaching the air induction box to the throttle body.
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Required Actions
Replace AN4H-17A bolts with new ones, ensure proper installation of 4 washers between spacers and air induction box, torque bolts to 35-40 inch-pounds, safety wire them, and modify the air induction box per Bellanca Service Letter 75 or FAA-approved revisions. Alternate methods require approval from the FAA Chief, Engineering and Manufacturing Branch.
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Compliance Time
Within 10 hours time in service after the effective date of this AD for paragraph a, and within 50 hours time in service after the effective date for paragraph b.
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Affected Aircraft
Bellanca Model 17-30A airplanes with serial numbers 30263 through 73-30489.
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Federal Register Abstract
Engine Induction Box Bolts
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_73-03-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-03-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bellanca Model 17-30A Airplanes Subject: Engine Induction Box Bolts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/07/1973 Make: Alexandria Aircraft, LLC Model: 17-30A Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 73-03-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1591 AD NUMBER: 73-03-03 SUBJECT HEADING: Airworthiness Directives; Bellanca Model 17-30A Airplanes ACTION: SUMMARY: DATES: Effective February 7, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-03-03 BELLANCA: Amdt. 39-1591. Applies to Model 17-30A (Serial Numbers 30263 through 73-30489) airplanes. Compliance: Required as indicated unless already accomplished. To prevent bolt failures and subsequent washer ingestion into the engine, accomplish the following: a) Within 10 hours time in service after the effective date of this AD, remove the 4 AN4H-17A bolts attaching the air induction box to the throttle body and replace these bolts with new ones. When reassembling the air induction box, assure that the 4 washers between the spacers and the air induction box are properly installed and the bolts are torqued to 35-40 inch- pounds and safety wired. b) Within 50 hours time in service after the effective date of this AD, modify the air induction box in accordance with Bellanca Service Letter Number 75 dated January 3, 1973, or later FAA approved revisions. c) Any alternate equivalent method of compliance with Paragraphs a and b above must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Great Lakes Region. This amendment becomes effective February 7, 1973. FOOTER:
Document Text
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AD Final Rules - DRS_73-03-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-03-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bellanca Model 17-30A Airplanes Subject: Engine Induction Box Bolts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/07/1973 Make: Alexandria Aircraft, LLC Model: 17-30A 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: 73-03-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1591 AD NUMBER: 73-03-03 SUBJECT HEADING: Airworthiness Directives; Bellanca Model 17-30A Airplanes ACTION: SUMMARY: DATES: Effective February 7, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-03-03 BELLANCA: Amdt. 39-1591. Applies to Model 17-30A (Serial Numbers 30263 through 73-30489) airplanes. Compliance: Required as indicated unless already accomplished. To prevent bolt failures and subsequent washer ingestion into the engine, accomplish the following: a) Within 10 hours time in service after the effective date of this AD, remove the 4 AN4H-17A bolts attaching the air induction box to the throttle body and replace these bolts with new ones. When reassembling the air induction box, assure that the 4 washers between the spacers and the air induction box are properly installed and the bolts are torqued to 35-40 inch- pounds and safety wired. b) Within 50 hours time in service after the effective date of this AD, modify the air induction box in accordance with Bellanca Service Letter Number 75 dated January 3, 1973, or later FAA approved revisions. c) Any alternate equivalent method of compliance with Paragraphs a and b above must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Great Lakes Region. This amendment becomes effective February 7, 1973. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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