AD 93-25-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; De Havilland Model DHC-8-311 Series Airplanes |
Unsafe Condition
Failure of the left- and right-hand underwing fairing angles, which could result in reduced structural integrity of the wing-to-fuselage attachment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a detailed visual inspection for cracking on the rear face of the underwing fairing angles (part number 85350927) by the earlier of 6,830 total landings or within 100 landings after 01/19/1994. If cracking found, replace with part numbers 85350927-107SP or 85350927-108SP before further flight. Repeat inspections every 6,930 landings if no cracks detected. Alternatively, replace all fairing angles with the new part numbers to terminate repetitive inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to the accumulation of 6,830 total landings, or within 100 landings after the effective date of this AD (01/19/1994), whichever occurs later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland Model DHC-8-311 series airplanes, serial numbers 240 through 279 inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Underwing Fairing Angles
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-25-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-25-01 Document Type: AD Final Rules Docket Number: 93-NM-91-AD Subject Heading: Airworthiness Directives; De Havilland Model DHC-8-311 Series Airplanes Subject: Underwing Fairing Angles Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/19/1994 Make: Bombardier Inc. Model: DHC-8-311 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 93-25-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 93-NM-91-AD AMENDMENT: 39-8767 AD NUMBER: 93-25-01 SUBJECT HEADING: Airworthiness Directives; De Havilland Model DHC-8-311 Series Airplanes ACTION: SUMMARY: DATES: Effective January 19, 1994. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-25-01 DE HAVILLAND, INC.: Amendment 39-8767. Docket 93-NM-91-AD. Applicability: Model DHC-8-311 series airplanes, serial numbers 240 through 279 inclusive, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent failure of the left- and right-hand underwing fairing angles, which could result in reduced structural integrity of the wing-to-fuselage attachment, accomplish the following: (a) Prior to the accumulation of 6,830 total landings, or within 100 landings after the effective date of this AD, whichever occurs later, perform a detailed visual inspection to detect cracking on the rear face of the left- and right-hand underwing fairing angles, having part number 85350927, in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993. (1) If no cracked fairing angle is found, repeat the inspection thereafter at intervals not to exceed 6,930 landings, in accordance with the service bulletin. (2) If any cracked fairing angle is found, prior to further flight, replace the cracked fairing angle with a new, non-reworked fairing angle, having part number 85350927-107SP or 85350927-108SP, in accordance with the service bulletin. (b) Replacement of the currently-installed left- and right-hand underwing fairing angles with new, non-reworked fairing angles, having part number 85350927-107SP or 85350927-108SP, in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993, constitutes terminating action for the repetitive inspection requirement of paragraph (a)(1) 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), 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 inspections and replacement shall be done in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993. 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, Engine and Propeller Directorate, New York Aircraft Certification Office, 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 January 19, 1994. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-25-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-25-01 Document Type: AD Final Rules Docket Number: 93-NM-91-AD Subject Heading: Airworthiness Directives; De Havilland Model DHC-8-311 Series Airplanes Subject: Underwing Fairing Angles Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/19/1994 Make: Bombardier Inc. Model: DHC-8-311 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: 93-25-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 93-NM-91-AD AMENDMENT: 39-8767 AD NUMBER: 93-25-01 SUBJECT HEADING: Airworthiness Directives; De Havilland Model DHC-8-311 Series Airplanes ACTION: SUMMARY: DATES: Effective January 19, 1994. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-25-01 DE HAVILLAND, INC.: Amendment 39-8767. Docket 93-NM-91-AD. Applicability: Model DHC-8-311 series airplanes, serial numbers 240 through 279 inclusive, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent failure of the left- and right-hand underwing fairing angles, which could result in reduced structural integrity of the wing-to-fuselage attachment, accomplish the following: (a) Prior to the accumulation of 6,830 total landings, or within 100 landings after the effective date of this AD, whichever occurs later, perform a detailed visual inspection to detect cracking on the rear face of the left- and right-hand underwing fairing angles, having part number 85350927, in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993. (1) If no cracked fairing angle is found, repeat the inspection thereafter at intervals not to exceed 6,930 landings, in accordance with the service bulletin. (2) If any cracked fairing angle is found, prior to further flight, replace the cracked fairing angle with a new, non-reworked fairing angle, having part number 85350927-107SP or 85350927-108SP, in accordance with the service bulletin. (b) Replacement of the currently-installed left- and right-hand underwing fairing angles with new, non-reworked fairing angles, having part number 85350927-107SP or 85350927-108SP, in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993, constitutes terminating action for the repetitive inspection requirement of paragraph (a)(1) 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), 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 inspections and replacement shall be done in accordance with de Havilland Alert Service Bulletin S.B. A8-53-46, Revision 'A', dated May 25, 1993. 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, Engine and Propeller Directorate, New York Aircraft Certification Office, 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 January 19, 1994. 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.