AD 70-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Entwicklungsgemeinschaft Sport- und Segelflug | Phoebus A1 | Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes |
| aircraft | Entwicklungsgemeinschaft Sport- und Segelflug | Phoebus B1 | Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes |
| aircraft | Entwicklungsgemeinschaft Sport- und Segelflug | Phoebus C | Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes |
Unsafe Condition
The rudder may become blocked by the back-slipping chute coupling.
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Required Actions
Replace the chute coupling with a modified coupling in accordance with Messerschmitt-Bolkow-Blohm Service Bulletin No. Phoebus-1/70 dated April 1970, or later LBA-approved issue or FAA-approved equivalent.
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Compliance Time
within the next 100 hours' time in service after the effective date of this AD
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Affected Aircraft
Entwicklungsgemeinschaft Sport-und Segelflug Model Phoebus A1, B1, and C Sailplanes up to and including S.N. 934 with a brake chute installed.
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Federal Register Abstract
Chute Coupling
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-21-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-21-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes Subject: Chute Coupling Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/05/1970 Make: Entwicklungsgemeinschaft Sport- und Segelflug Model: Phoebus A1 | Phoebus B1 | Phoebus C Product Type: Aircraft Product Subtype: Glider Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-21-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1088 AD NUMBER: 70-21-03 SUBJECT HEADING: Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes ACTION: SUMMARY: DATES: Effective November 5, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-21-03 ENTWICKLUNGSGEMEINSCHAFT: Amendment 39-1088. Applies to Model "PHOEBUS" A1, B1, and C Sailplanes up to and including S.N 934 which have a brake chute installed. To prevent the rudder from becoming blocked by the back-slipping chute coupling, within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, replace the chute coupling with a modified coupling in accordance with Messerschmitt - Bolkow - Blohm Service Bulletin No. Phoebus-1/70 dated April 1970, or later LBA-approved issue or an FAA-approved equivalent. This amendment becomes effective November 5, 1970. FOOTER:
Document Text
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AD Final Rules - DRS_70-21-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-21-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes Subject: Chute Coupling Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/05/1970 Make: Entwicklungsgemeinschaft Sport- und Segelflug Model: Phoebus A1 | Phoebus B1 | Phoebus C Product Type: Aircraft Product Subtype: Glider Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-21-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1088 AD NUMBER: 70-21-03 SUBJECT HEADING: Airworthiness Directives; Entwicklungsgemeinschaft Model "PHOEBUS" A1, B1, and C Sailplanes ACTION: SUMMARY: DATES: Effective November 5, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-21-03 ENTWICKLUNGSGEMEINSCHAFT: Amendment 39-1088. Applies to Model "PHOEBUS" A1, B1, and C Sailplanes up to and including S.N 934 which have a brake chute installed. To prevent the rudder from becoming blocked by the back-slipping chute coupling, within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, replace the chute coupling with a modified coupling in accordance with Messerschmitt - Bolkow - Blohm Service Bulletin No. Phoebus-1/70 dated April 1970, or later LBA-approved issue or an FAA-approved equivalent. This amendment becomes effective November 5, 1970. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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Related Airworthiness Directives
75-18-01
final ruleAirworthiness Directives; Entwicklungsgemeinschaft (Messerschmitt-Bolkow-Blohm GmbH) Model Phoebus A1 and B1 Gliders
Unsafe Condition: Cracks in the rudder control cable lever weld could lead to loss of rudder control.