71-13-05 DORNIER GmbH: Amdt. 39-1233. Applies to Model Do-28D-1, Serial Nos. 4002 through 4049.
Within the next 50 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 100 hours' time in service from the last inspection, inspect the landing gear wheel forks for cracks in accordance with Dornier Service Bulletin No. 1039-1501 or an FAA-approved equivalent. If cracks are found during any inspection, before further flight replace the fork with a serviceable part of the same part number.
This amendment becomes effective June 23, 1971.