AD 93-11-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
Unsafe Condition
Degradation of the structural capabilities of the nose landing gear drag strut attachment fitting due to the use of MS rivets.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the six MS rivets with hi-strength Hi-Lok fasteners per Modification 7/2572 and Service Bulletin 7-53-32. For airplanes with serial numbers 3 through 27, install a new outer drag strut attachment fitting per Modification 7/1328 and Service Bulletins 7-53-31 and Notice of Status Change 7-53-31-1. Alternative methods may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 months after the effective date of this AD (July 22, 1993).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland DHC-7 series airplanes (models DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103) certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Nose Landing Gear Drag Strut Attachment Fitting
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-11-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-11-09 Document Type: AD Final Rules Docket Number: 92-NM-205-AD Subject Heading: Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes Subject: Nose Landing Gear Drag Strut Attachment Fitting Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/22/1993 Make: Viking Air Limited Model: DHC-7-1 | DHC-7-100 | DHC-7-101 | DHC-7-102 | DHC-7-103 Product Type: Aircraft Product Subtype: Large 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: 93-11-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-205-AD AMENDMENT: 39-8599 AD NUMBER: 93-11-09 SUBJECT HEADING: Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes ACTION: SUMMARY: DATES: Effective July 22, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-11-09 DE HAVILLAND, INC.: Amendment 39-8599. Docket 92-NM-205-AD. Applicability: All Model DHC-7 series airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent degradation of the structural capabilities of the affected airplanes, accomplish the following: (a) For all affected airplanes: Within 6 months after the effective date of this AD, replace the six MS rivets with hi-strength Hi-Lok fasteners, Modification 7/2572, in the drag strut attachment fitting of the nose landing gear, in accordance with de Havilland Service Bulletin S.B. 7-53-32, dated March 15, 1991. (b) For airplanes having serial numbers 3 through 27, inclusive: Installation of a new outer drag strut attachment fitting, Modification 7/1328, in accordance with de Havilland Service Bulletin 7-53-31, dated December 15, 1989, as revised by Notice of Status Change 7-53-31-1, dated April 20, 1990, constitutes an acceptable alternative method of compliance with the requirements of this AD. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (e) The replacement shall be done in accordance with de Havilland Service Bulletin S.B. 7-53-32, dated March 15, 1991. The installation shall be done in accordance with de Havilland Service Bulletin 7-53-31, dated December 15, 1989; and Notice of Status Change 7-53-31-1, dated April 20, 1990, for de Havilland Service Bulletin 7-53-51, dated December 15, 1989. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, New York Aircraft Certification Office, Engine and Propeller Directorate, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on July 22, 1993. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-11-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-11-09 Document Type: AD Final Rules Docket Number: 92-NM-205-AD Subject Heading: Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes Subject: Nose Landing Gear Drag Strut Attachment Fitting Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/22/1993 Make: Viking Air Limited Model: DHC-7-1 | DHC-7-100 | DHC-7-101 | DHC-7-102 | DHC-7-103 Product Type: Aircraft Product Subtype: Large 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: 93-11-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-205-AD AMENDMENT: 39-8599 AD NUMBER: 93-11-09 SUBJECT HEADING: Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes ACTION: SUMMARY: DATES: Effective July 22, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-11-09 DE HAVILLAND, INC.: Amendment 39-8599. Docket 92-NM-205-AD. Applicability: All Model DHC-7 series airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent degradation of the structural capabilities of the affected airplanes, accomplish the following: (a) For all affected airplanes: Within 6 months after the effective date of this AD, replace the six MS rivets with hi-strength Hi-Lok fasteners, Modification 7/2572, in the drag strut attachment fitting of the nose landing gear, in accordance with de Havilland Service Bulletin S.B. 7-53-32, dated March 15, 1991. (b) For airplanes having serial numbers 3 through 27, inclusive: Installation of a new outer drag strut attachment fitting, Modification 7/1328, in accordance with de Havilland Service Bulletin 7-53-31, dated December 15, 1989, as revised by Notice of Status Change 7-53-31-1, dated April 20, 1990, constitutes an acceptable alternative method of compliance with the requirements of this AD. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (e) The replacement shall be done in accordance with de Havilland Service Bulletin S.B. 7-53-32, dated March 15, 1991. The installation shall be done in accordance with de Havilland Service Bulletin 7-53-31, dated December 15, 1989; and Notice of Status Change 7-53-31-1, dated April 20, 1990, for de Havilland Service Bulletin 7-53-51, dated December 15, 1989. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, New York Aircraft Certification Office, Engine and Propeller Directorate, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on July 22, 1993. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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