The next day, a hinge bolt of one of the rotor blades failed due to a fatigue crack, and the helicopter fell to the ground.
42.
Fractography can determine whether a cause of train derailment was a faulty rail, or if a wing of a plane had fatigue cracks before a crash.
43.
The Federal Aviation Administration has ordered inspections of 1, 000 aging Boeing 727s for skin joint fatigue cracks, a problem first found at Delta Air Lines.
44.
The probable cause of the crash was determined to be the center wing section failing due to a fatigue crack in the lower central wing panel.
45.
DELTA-727 _ ATLANTA _ FAA orders inspections of 1, 000 older Boeing 727s for skin joint fatigue cracks, a problem initially discovered by Delta Air Lines.
46.
A descending cage carrying the men failed to slow down as it approached the bottom of the fatigue crack reached a critical size and the brake-rod parted.
47.
The NTSB found that there was a fatigue crack in the power control module, and that it was not possible to visually inspect that type of failure.
48.
Wildey said his investigation found minor corrosion and a few fatigue cracks in the 25-year-old plane but these were minor and played no part in the crash.
49.
Scoring of the wall of the hole and the absence of an interference fit left the inner lower boom vulnerable to developing fatigue cracks at Station 143.
50.
Several of the directives on McNally's jet mandated repairs on wing parts, and at least five of those directives noted " fatigue cracks " on the wings.
