“One would hope that that’s being examined really hard,” said retired military crash investigator Tom Farrier. Since July 2022, there have been at least seven instances of metal chips found in the gear boxes, though no fatalities have resulted. Metal chips in the gear boxesĪn NBC News review of Osprey mishap and hazard data from the Navy and Marines, however, shows other incidents involving the propeller rotor gear boxes. ![]() While it was first believed that the Osprey grounding could last as long as a year, it’s now expected that the aircraft may return to flight soon, possibly within weeks, according to multiple military officials. The military’s joint program office for the aircraft told NBC News that the last of the 19 hard clutch engagements reported by all three service branches occurred in January 2023. In the past the Ospreys sometimes had a problem called a "hard clutch engagement," which in one June 2022 incident caused a crash that killed five Marines. In February 2023 the military said while they had still not determined a root cause for the hard clutch incidents, officials were 99% sure the clutch problem was fixed. ![]() Kota Kiriyama / The Yomiuri Shimbun via AP salvage vessel in Yakushima Town, Kagoshima Prefecture in December. An aerial photo shows an object believed to be part of the U.S. The military has about 400 Ospreys that are used by the Navy, Marines and Air Force, though most are flown by the Marine Corps. Ospreys can take off vertically like helicopters, but then tilt their two rotors to fly like dual propeller planes. Any disclosure of findings prior to investigations being finalized is premature and presumptive." At this time, the material failure that occurred is known but the cause of the failure has not been determined. ![]() In a statement after initial publication of this article, a spokesperson for Air Force Special Operations Command told NBC News that investigations into the incident "are still actively in progress and analysis is ongoing to determine the cause of the mishap. The cause of the crash off Japan is still under investigation and has not been established, according to those familiar with the investigation.
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