# Proposed AD FAA-2008-1078: BURKHART GROB LUFT--UND RAUMFAHRT GmbH & CO KG G103 Series Gliders

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Burkhart Grob Luft-und
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 9, 2008, 73 FR 59571
- Comments due: November 10, 2008
- Docket: FAA-2008-1078 (https://www.regulations.gov/docket/FAA-2008-1078, where comments are filed)
- Project: 2008-CE-051-AD
- FR document: E8-23973
- Official PDF: https://openairdocs.org/files/sha256/65/4a/654a93f8433e9e184342aed0a832839ac0c839a15eacc46398b2652d344b548a (from https://www.govinfo.gov/content/pkg/FR-2008-10-09/pdf/E8-23973.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/10/09/E8-23973/airworthiness-directives-burkhart-grob-luft-und-raumfahrt-gmbh-and-co-kg-g103-series-gliders
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4C4E2CD45EF70F62862574DD00551311.0001
- Page: https://openairdocs.org/proposed/FAA-2008-1078

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

The Luftfahrt-Bundesamt received a report from the Grob Company that a bolt in the airbrake control was found failed during a pre- flight inspection on a G 103C TWIN III ACRO. During an extensive investigation (metallurgical investigation) a double sided fatigue crack was found as root cause. As the bolt is insignificantly stressed by cyclic bending the crack was probably caused by mean stress supported by a bolt torque exceeding the limit. The actions specified by this airworthiness directive are intended to prevent further bolt cracking which can result in airbrake as well as elevator failure (elevator control is on the same pedestal) and reduced controllability of the power glider.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Oct 9, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-23973, comments due Nov 10, 2008 (https://www.federalregister.gov/documents/2008/10/09/E8-23973/airworthiness-directives-burkhart-grob-luft-und-raumfahrt-gmbh-and-co-kg-g103-series-gliders)

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