A new airworthiness directive for the MD Helicopters MD500N, MD600N and MD900 requires determining the cure date for each Notar fan blade tension-torsion strap (T-T strap). The light at the end of ...

For 1981 there was an entirely new engine, the single remnant of the old being the bore staying at 88 mm, with the stroke now growing to 82 mm for a grand total of 498 cc. A pair of ...