AD 88-12-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Burkhart Grob Luft-Und | G103 Twin Astir | Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWIN II, and G103A TWIN II ACRO Gliders |
| aircraft | Burkhart Grob Luft-Und | G103 Twin II | Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWIN II, and G103A TWIN II ACRO Gliders |
| aircraft | Burkhart Grob Luft-Und | G103A Twin II Acro | Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWIN II, and G103A TWIN II ACRO Gliders |
Unsafe Condition
The tow-hook knob may drop into the control stick boot during flight and obstruct control stick movement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the aft tow-hook knob for wear, cracks, or looseness within 10 hours time-in-service after the effective date. If wear, cracks, or looseness is found, relocate the tow-hook knob position before further flight. If no issues are found, relocate the knob within 20 hours time-in-service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 10 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR (Serial Numbers 3000 through 3291), G103 TWIN II (Serial Numbers 3501 through 3878), and G103A TWIN II ACRO (Serial Numbers 3501 through 3878 with supplement 'K' in the number).
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Tow-Hook Knob
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_88-12-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 88-12-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWI...Show more Subject: Tow-Hook Knob Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/09/1988 Make: Burkhart Grob Luft-Und Model: G103 Twin Astir | G103 Twin II | G103A Twin II Acro 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: 88-12-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5915 AD NUMBER: 88-12-08 SUBJECT HEADING: Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWIN II, and G103A TWIN II ACRO Gliders ACTION: SUMMARY: DATES: Effective June 9, 1988. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 88-12-08 GROB WERKE GMBH AND CO. KG (BURKHART GROB): Amendment 39-5915. Applies to the following models certificated in any category: G103 TWIN ASTIR, Serial Numbers 3000 through 3291. G103 TWIN II, Serial Numbers 3501 through 3878. G103A TWIN II ACRO, Serial Numbers 3501 through 3878 with supplement "K" in the number. Compliance is required as indicated, unless already accomplished. To prevent the tow-hook knob from dropping into the control stick boot during flight and obstructing control stick movement, accomplish the following: (a) If the guide-sleeve cut out is located at the bottom left hand (LH) corner of the instrument panel, as shown in Fig. 1 and Fig. 2 of Grob Service Bulletin (SB) TM 315-32, within the next 10 hours time-in-service after the effective date of this AD, visually inspect the aft tow- hook knob in the area of the guide sleeve for wear, cracks or looseness of the tow-hook knob. (b) If wear, cracked sleeve or looseness is determined, before further flight, unless already accomplished, relocate the position of tow-hook knob in accordance with Instruction 2 in Grob SB TM 315-32, dated June 12, 1987. (c) If the inspection of (a) determines that no wear, crack or looseness of any part in the tow-hook knob exist, accomplish the relocation of the knob as indicated in (b) within the next 20 hours time-in-service after the effective date of this AD. (d) Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Brussels Aircraft Certification Office, AEU-100, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, 15 Rue de la Loi B-1040 Brussels, Belgium, Telephone No. 513.38.30 ext. 2710 or the Manager, New York Aircraft Certification Office, Aircraft Certification Division, Federal Aviation Administration, New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581; telephone (516) 791- 6680. (e) Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Brussels Aircraft Certification Office or the Manager, New York Aircraft Certification Office, may adjust the compliance time specified in this AD. Grob SB TM 315-32, dated June 12, 1987, identified and described in this document, is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Grob Systems, Inc., Aircraft Division, I-75 and Airport Drive, Bluffton, Ohio 45817. These documents may also be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Rules Docket 88-ANE-15, between the hours of 8:00 a.m. and 4:30 p.m., Monday thru Friday, except federal holidays. This amendment, 39-5915, becomes effective on June 9, 1988. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_88-12-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 88-12-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWI...Show more Subject: Tow-Hook Knob Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/09/1988 Make: Burkhart Grob Luft-Und Model: G103 Twin Astir | G103 Twin II | G103A Twin II Acro 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: 88-12-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5915 AD NUMBER: 88-12-08 SUBJECT HEADING: Airworthiness Directives; GROB WERKE GMBH AND CO. KG (BURKHART GROB) Model G103 TWIN ASTIR, G103 TWIN II, and G103A TWIN II ACRO Gliders ACTION: SUMMARY: DATES: Effective June 9, 1988. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 88-12-08 GROB WERKE GMBH AND CO. KG (BURKHART GROB): Amendment 39-5915. Applies to the following models certificated in any category: G103 TWIN ASTIR, Serial Numbers 3000 through 3291. G103 TWIN II, Serial Numbers 3501 through 3878. G103A TWIN II ACRO, Serial Numbers 3501 through 3878 with supplement "K" in the number. Compliance is required as indicated, unless already accomplished. To prevent the tow-hook knob from dropping into the control stick boot during flight and obstructing control stick movement, accomplish the following: (a) If the guide-sleeve cut out is located at the bottom left hand (LH) corner of the instrument panel, as shown in Fig. 1 and Fig. 2 of Grob Service Bulletin (SB) TM 315-32, within the next 10 hours time-in-service after the effective date of this AD, visually inspect the aft tow- hook knob in the area of the guide sleeve for wear, cracks or looseness of the tow-hook knob. (b) If wear, cracked sleeve or looseness is determined, before further flight, unless already accomplished, relocate the position of tow-hook knob in accordance with Instruction 2 in Grob SB TM 315-32, dated June 12, 1987. (c) If the inspection of (a) determines that no wear, crack or looseness of any part in the tow-hook knob exist, accomplish the relocation of the knob as indicated in (b) within the next 20 hours time-in-service after the effective date of this AD. (d) Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Brussels Aircraft Certification Office, AEU-100, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, 15 Rue de la Loi B-1040 Brussels, Belgium, Telephone No. 513.38.30 ext. 2710 or the Manager, New York Aircraft Certification Office, Aircraft Certification Division, Federal Aviation Administration, New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581; telephone (516) 791- 6680. (e) Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Brussels Aircraft Certification Office or the Manager, New York Aircraft Certification Office, may adjust the compliance time specified in this AD. Grob SB TM 315-32, dated June 12, 1987, identified and described in this document, is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Grob Systems, Inc., Aircraft Division, I-75 and Airport Drive, Bluffton, Ohio 45817. These documents may also be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Rules Docket 88-ANE-15, between the hours of 8:00 a.m. and 4:30 p.m., Monday thru Friday, except federal holidays. This amendment, 39-5915, becomes effective on June 9, 1988. 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.
Related Airworthiness Directives
2005-26-14
final ruleAirworthiness Directives; BURKHARDT GROB LUFT-UND RAUMFA HRT GmbH & CO KG Model G103 TWIN ASTIR Sailplanes
Unsafe Condition: Cracks in the elevator lever, part number 103-3521, could cause the elevator lever to fail, resulting in loss of control of the sailplane.
2005-26-12
final ruleAirworthiness Directives; BURKHARDT GROB LUFT-UND RAUMFAHRT GmbH & CO KG Models G103 TWIN ASTIR, G103 TWIN II, G103A TWIN II ACRO, G103C TWIN III ACRO, and G 103 C Twin III SL Sailplanes
Unsafe Condition: Cracked center of gravity (CG) release hook attachment brackets could lead to abnormal or uncontrolled sailplane release, resulting in reduced or loss of sailplane control.
2003-19-14 R2
final ruleAirworthiness Directives; BURKHART GROB LUFT--UND RAUMFAHRT GmbH & CO KG Models G103 TWIN ASTIR, G103A TWIN II ACRO, and G103C TWIN III ACRO Sailplanes
Unsafe Condition: Damage to the fuselage during limit load flight could result in reduced structural integrity and loss of control of the sailplane.
97-24-10
final ruleAirworthiness Directives; Burkhart Grob Luft-und Raumfahrt, GmbH. Model G 103 Twin Astir Sailplanes
Unsafe Condition: Cracked airbrake over-center levers could result in asymmetrical airbrake deployment, leading to uncontrollable roll and possible loss of control.