AD 98-12-04

Applies to

Model DG-500M gliders, all serial numbers, certificated in any category.

The FAA's summary

This amendment adopts a new airworthiness directive (AD) that applies to all Glaser-Dirks Flugzeugbau GmbH (Glaser-Dirks) Model DG- 500M gliders. This AD requires installing a rudder gap seal and modifying the cooling liquid reservoir mount. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent rudder vibrations caused by flow separation at the rudder gap, which could result in flutter with consequent loss of rudder control.

Filed under

The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.

Official sources

• The Federal Register document · document 98-14618, the legal text
• FAA Dynamic Regulatory System (DRS) · search 98-12-04 for its current status and any corrections