AD 85-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105S | Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters |
Unsafe Condition
Cracks in the vertical fin spar and skins and possible failure of the vertical fin.
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Required Actions
Accomplish modifications specified in MBB BO-105 Service Bulletin No. 30-13, Rev. 2 (for S/N S1-S310) and Service Bulletin No. 30-18, Rev. 3 (for S/N S1-S350). Aircraft may be flown to a base for compliance under FAR Sections 21.197 and 21.199. Equivalent means require FAA approval.
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Compliance Time
within 50 hours time in service after the effective date of this AD
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Affected Aircraft
MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 series helicopters, S/N's S1 through S350, equipped with empennage P/N 105-30101
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Federal Register Abstract
Vertical Fin Spar And Skins
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_85-08-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 85-08-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters Subject: Vertical Fin Spar And Skins Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/26/1985 Make: Airbus Helicopters Deutschland GmbH Model: BO-105A | BO-105C | BO-105S Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 85-08-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5038 AD NUMBER: 85-08-01 SUBJECT HEADING: Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters ACTION: SUMMARY: DATES: Effective April 26, 1985. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 85-08-01 MESSERSCHMITT-BOLKOW-BLOHM GmbH: Amendment 39-5038. Applies to Model BO-105 series helicopters, S/N's S1 through S350, certificated in all categories, that are equipped with empennage P/N 105-30101. Compliance is required within 50 hours time in service after the effective date of this AD, unless already accomplished. To prevent cracks in the vertical fin spar and skins and possible failure of the vertical fin, accomplish the following modifications: (a) For helicopters with S/N's S1 through S310, incorporate the tail fin modification and reinforcement specified in MBB BO-105 Service Bulletin No. 30-13, Rev. 2, dated April 24, 1978. (b) For helicopters with S/N's S1 through S350, incorporate the gearbox mount and upper fin modification specified in MBB BO-105 Service Bulletin No. 30-18, Rev. 3, dated October 30, 1984. (c) Aircraft may be flown in accordance with FAR Sections 21.197 and 21.199 to a base where compliance may be accomplished. (d) Equivalent means of complying with this AD must be approved by the Manager, Aircraft Certification Office, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Belgium. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part thereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies of the service bulletins upon request to MBB Helicopter Corporation, P.O. Box 2349, West Chester, Pennsylvania 19380. The documents also may be examined at the Office of the Regional Counsel, Southwest Region, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas. This amendment becomes effective April 26, 1985. FOOTER:
Document Text
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AD Final Rules - DRS_85-08-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 85-08-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters Subject: Vertical Fin Spar And Skins Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/26/1985 Make: Airbus Helicopters Deutschland GmbH Model: BO-105A | BO-105C | BO-105S Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 85-08-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5038 AD NUMBER: 85-08-01 SUBJECT HEADING: Airworthiness Directive; MESSERSCHMITT-BOLKOW-BLOHM GmbH Model BO-105 Series Helicopters ACTION: SUMMARY: DATES: Effective April 26, 1985. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 85-08-01 MESSERSCHMITT-BOLKOW-BLOHM GmbH: Amendment 39-5038. Applies to Model BO-105 series helicopters, S/N's S1 through S350, certificated in all categories, that are equipped with empennage P/N 105-30101. Compliance is required within 50 hours time in service after the effective date of this AD, unless already accomplished. To prevent cracks in the vertical fin spar and skins and possible failure of the vertical fin, accomplish the following modifications: (a) For helicopters with S/N's S1 through S310, incorporate the tail fin modification and reinforcement specified in MBB BO-105 Service Bulletin No. 30-13, Rev. 2, dated April 24, 1978. (b) For helicopters with S/N's S1 through S350, incorporate the gearbox mount and upper fin modification specified in MBB BO-105 Service Bulletin No. 30-18, Rev. 3, dated October 30, 1984. (c) Aircraft may be flown in accordance with FAR Sections 21.197 and 21.199 to a base where compliance may be accomplished. (d) Equivalent means of complying with this AD must be approved by the Manager, Aircraft Certification Office, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, Brussels, Belgium. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part thereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies of the service bulletins upon request to MBB Helicopter Corporation, P.O. Box 2349, West Chester, Pennsylvania 19380. The documents also may be examined at the Office of the Regional Counsel, Southwest Region, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas. This amendment becomes effective April 26, 1985. FOOTER:
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Retrieved: Apr 8, 2026
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