AD 77-25-04
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Alexander Schleicher GmbH & Co. | Rhonlerche II | Airworthiness Directives; Alexander Schleicher Model Rhonlerche II Gliders |
Unsafe Condition
Shearing of the cotter pins which safety the aileron control Clevis pins and possible loss of aileron control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect Clevis pins connecting aileron control cables to main control shaft and re-insert from aft to front with new cotter pins if not properly oriented. Inspect skid thickness and replace if 3/4 inches or less in thickness, focusing on the area 24 to 32 inches in front of the wheel-axle. Revise flight and service manual to include Clevis pin insertion direction and skid thickness requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 5 hours time in service after the effective date of this AD, unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Alexander Schleicher GmbH & Co. Model Rhonlerche II gliders, all serial numbers
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Clevis Pins
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_77-25-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-25-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Alexander Schleicher Model Rhonlerche II Gliders Subject: Clevis Pins Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/27/1977 Make: Alexander Schleicher GmbH & Co. Model: Rhonlerche II Product Type: Aircraft Product Subtype: Glider Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-25-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3095 AD NUMBER: 77-25-04 SUBJECT HEADING: Airworthiness Directives; Alexander Schleicher Model Rhonlerche II Gliders ACTION: SUMMARY: DATES: Effective December 27, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-25-04 ALEXANDER SCHLEICHER: Amendment 39-3095. Applies to Model Rhonlerche II gliders, all serial numbers, certificated in all categories. Compliance is required within the next 5 hours time in service after the effective date of this AD, unless already accomplished. To prevent shearing of the cotter pins which safety the aileron control Clevis pins and possible loss of aileron control, accomplish the following: (a) Inspect the Clevis pins connecting the aileron control cables to the main control shaft and if found not to be inserted from aft to front (Head of Clevis pin must face wheelbox), re-insert the Clevis pins from aft to front and install new cotter pins. (b) Inspect the skid. If it is found to be 3/4 inches or less in thickness, replace the skid with a serviceable skid of the same part number or an equivalent approved by the Chief, Aircraft Certification Staff, Federal Aviation Administration, Europe, Africa, and Middle East Region, c/o American Embassy, A.P.O. New York, N.Y. 09667. NOTE: During the inspection required by this paragraph, particular attention should be given to the skid in the area from 24 to 32 inches in front of the wheel-axle. (c) Revise the Rhonlerche II flight and service manual as follows: (1) On Page 5, after the words "connect at the control shaft", insert the words "the Clevis pins must be inserted from aft to front". (2) On Page 9, prior to the words "If the glider is used much on rocky and . . .", insert the sentence "Measured 24 to 32 inches forward of the wheel-axle, the skid must not be thinner than 3/4 inch". Note: Alexander Schleicher Technical Note No. 14 dated September 15, 1977, deals with the same subject as this AD. This amendment becomes effective December 27, 1977. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_77-25-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-25-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Alexander Schleicher Model Rhonlerche II Gliders Subject: Clevis Pins Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/27/1977 Make: Alexander Schleicher GmbH & Co. Model: Rhonlerche II 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: 77-25-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3095 AD NUMBER: 77-25-04 SUBJECT HEADING: Airworthiness Directives; Alexander Schleicher Model Rhonlerche II Gliders ACTION: SUMMARY: DATES: Effective December 27, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-25-04 ALEXANDER SCHLEICHER: Amendment 39-3095. Applies to Model Rhonlerche II gliders, all serial numbers, certificated in all categories. Compliance is required within the next 5 hours time in service after the effective date of this AD, unless already accomplished. To prevent shearing of the cotter pins which safety the aileron control Clevis pins and possible loss of aileron control, accomplish the following: (a) Inspect the Clevis pins connecting the aileron control cables to the main control shaft and if found not to be inserted from aft to front (Head of Clevis pin must face wheelbox), re-insert the Clevis pins from aft to front and install new cotter pins. (b) Inspect the skid. If it is found to be 3/4 inches or less in thickness, replace the skid with a serviceable skid of the same part number or an equivalent approved by the Chief, Aircraft Certification Staff, Federal Aviation Administration, Europe, Africa, and Middle East Region, c/o American Embassy, A.P.O. New York, N.Y. 09667. NOTE: During the inspection required by this paragraph, particular attention should be given to the skid in the area from 24 to 32 inches in front of the wheel-axle. (c) Revise the Rhonlerche II flight and service manual as follows: (1) On Page 5, after the words "connect at the control shaft", insert the words "the Clevis pins must be inserted from aft to front". (2) On Page 9, prior to the words "If the glider is used much on rocky and . . .", insert the sentence "Measured 24 to 32 inches forward of the wheel-axle, the skid must not be thinner than 3/4 inch". Note: Alexander Schleicher Technical Note No. 14 dated September 15, 1977, deals with the same subject as this AD. This amendment becomes effective December 27, 1977. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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Related Airworthiness Directives
76-15-02
final ruleAirworthiness Directives; Alexander Schleicher Model Rhonlerche II Gliders
Unsafe Condition: Cracks in the welded area between the flight control horizontal torsion tube and the front control stick mount could lead to front control stick separation from the mount.