Navy Helicopter Vibrated Before Falling Into the Sea, Report Says

A U.S. Navy helicopter that crashed off the coast close to San Diego final week, killing 5 sailors, landed on an plane service and skilled vibrations earlier than its foremost rotor struck the flight deck and the plane fell into the ocean, the Navy stated in a security report.

The MH-60S Seahawk helicopter had been working from the flight deck of the U.S.S. Abraham Lincoln, a Nimitz-class plane service, earlier than it crashed into the sea about four:30 p.m. native time on Aug. 31, the Navy stated.

Efforts to save lots of the 5 sailors who had been declared lacking after the crash ended on Saturday. One individual was rescued from the helicopter, in response to the Navy, and 5 individuals on the flight deck had been injured.

The Navy didn’t elaborate on what had occurred to the Seahawk, or what had triggered the accidents on the flight deck. But a day after the crash, an merchandise on Page 28 of a often revealed security report provided extra particulars.

According to the report from the Naval Safety Center, the helicopter touched down on the Lincoln earlier than it “experienced side-to-side vibrations causing main rotor to strike flight deck.” The plane then fell over the aspect of the service, the report stated. Details of the crash from the security report had been reported by Navy Times.

Lt. Bradley A. Foster

U.S. Navy, through Associated Press

Sarah F. Burns

U.S. Navy, through Associated Press

James P. Buriak

U.S. Navy, through Associated Press

Bailey J. Tucker

U.S. Navy, through Associated Press

Lt. Paul R. Fridley

U.S. Navy, through Associated Press

slide 1

slide 2

slide three

slide four

slide 5

Matthew Robinson, an plane security professional and former plane accident investigator with the Naval Safety Center, stated the crash may have been triggered — or exacerbated — by any variety of elements together with mechanical failures, poor upkeep, pilot error, the motion of the plane service in the ocean, and even wind circumstances.

“We need to be cautious about developing theories before evidence collection and analysis,” he stated.

The security report, he stated, appeared to point out some indication of “ground resonance,” a phenomenon triggered partly by an imbalance inside the rotor system that may trigger helicopters to shudder whereas on the floor, generally violently sufficient to tear the plane aside.

Mr. Robinson stated that the Seahawk may need additionally skilled a dynamic rollover — when a helicopter banks so steeply that it can not recuperate equilibrium — and added that blade injury from the rotor’s collision with the deck may have made stabilization unattainable.

Five search helicopters joined the U.S.S. Lincoln, the U.S.S. Cincinnati and Coast Guard vessels in the seek for the lacking sailors, who had been a part of the Navy’s Third Fleet. They had been declared useless on Saturday after a search that the Navy stated lasted greater than 72 hours. No stays have been discovered.

The helicopter had been conducting “routine flight operations” about 60 nautical miles off the coast, Navy officers stated. On Wednesday, a spokesman for the Third Fleet stated that the Navy had nothing so as to add to the report, and stated that the episode was nonetheless beneath investigation.

Navy officers on Sunday recognized the sailors as Lt. Bradley A. Foster, 29, a pilot from Oakhurst, Calif.; Lt. Paul R. Fridley, 28, a pilot from Annandale, Va.; James P. Buriak, 31, a second-class Naval aircrewman from Salem, Va.; Sarah F. Burns, 31, a second-class hospital corpsman from Severna Park, Md.; and Bailey J. Tucker, 21, a third-class hospital corpsman from St. Louis.

The MH-60S is a mannequin that has been in use since 2002, in response to the Naval Air Systems Command. The 14,000-pound helicopter has a variety of 245 nautical miles and might attain a prime velocity of 180 knots, in response to the command. The Navy has greater than 250 MH-60S helicopters in use, the command stated.

MH-60S helicopters are used for an array of functions, together with “vertical replenishment, combat search and rescue, special warfare support and airborne mine countermeasures” in response to Naval Technology, a web site that reviews on navy tools.