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pdf Gfa ad 521 Cancelled 2017.02.07 Popular

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gfa ad 521 Cancelled 07.02.2017.pdf

Gfa ad 521 Cancelled 2017.02.07

EXTENSION OF SERVICE LIFE

CANCELLED - Refer Type Certificate Holders current data

Fatigue tests on fibre composite wings and wing spars have demonstrated that a service life expectancy of 12000 hours can be reached for these structural components. As these fatigue test programs did not examine the entire aircraft made of fibre composite, the service life of 12000 hours can be granted only if the long-term airworthiness of each individual aircraft is demonstrated in a special multi-stage inspection program (over and above the mandatory annual C of A inspections) for the purpose of increasing the service life of the Discus bT. This has to be incorporated in the Discus bT Maintenance Manual. Schempp-Hirth Flugzeugbau GmbH Technical Note No. 863-5 herewith becomes part of this AD.