Bell Boeing MV-22B Osprey. (Janes/Lindsay Peacock)

A fatal 8 June 2022 US Marine Corps (USMC) MV-22 crash in Glamis, California, was traced to dual hard clutch engagement (HCE) in the right engine assembly, according to a report released on 21 July. The accident report found no fault in either aircraft maintenance or the crew's conduct.

The crash killed five marines. The aircraft and crew were assigned to the 3rd Marine Aircraft Wing, based at Marine Corps Air Station Miramar, California, and were conducting low-altitude runs over a gunnery range when the incident happened.

The accident occurred when the right engine clutch, which connects the engine to the proprotor, disengaged and rapidly re-engaged, an occurrence called a hard clutch engagement. The strain from the HCE caused a shaft to shear in the tiltrotor's Single Engine and Interconnect Drive System (Single Engine/ICDS), which connects the two engines together such that one engine can power both proprotors. The Single Engine/ICDS failure resulted in a loss of thrust from the right proprotor, which sent the MV-22 into an unrecoverable turning descent, according to the accident report.

Bell Boeing MV-22B Osprey. (Janes/Lindsay Peacock)

A fatal 8 June 2022 US Marine Corps (USMC) MV-22 crash in Glamis, California, was traced to dual hard clutch engagement (HCE) in the right engine assembly, according to a report released on 21 July. The accident report found no fault in either aircraft maintenance or the crew's conduct.

The crash killed five marines. The aircraft and crew were assigned to the 3rd Marine Aircraft Wing, based at Marine Corps Air Station Miramar, California, and were conducting low-altitude runs over a gunnery range when the incident happened.

The accident occurred when the right engine clutch, which connects the engine to the proprotor, disengaged and rapidly re-engaged, an occurrence called a hard clutch engagement. The strain from the HCE caused a shaft to shear in the tiltrotor's Single Engine and Interconnect Drive System (Single Engine/ICDS), which connects the two engines together such that one engine can power both proprotors. The Single Engine/ICDS failure resulted in a loss of thrust from the right proprotor, which sent the MV-22 into an unrecoverable turning descent, according to the accident report.

Bell Boeing MV-22B Osprey. (Janes/Lindsay Peacock)

A fatal 8 June 2022 US Marine Corps (USMC) MV-22 crash in Glamis, California, was traced to dual hard clutch engagement (HCE) in the right engine assembly, according to a report released on 21 July. The accident report found no fault in either aircraft maintenance or the crew's conduct.

The crash killed five marines. The aircraft and crew were assigned to the 3rd Marine Aircraft Wing, based at Marine Corps Air Station Miramar, California, and were conducting low-altitude runs over a gunnery range when the incident happened.

The accident occurred when the right engine clutch, which connects the engine to the proprotor, disengaged and rapidly re-engaged, an occurrence called a hard clutch engagement. The strain from the HCE caused a shaft to shear in the tiltrotor's Single Engine and Interconnect Drive System (Single Engine/ICDS), which connects the two engines together such that one engine can power both proprotors. The Single Engine/ICDS failure resulted in a loss of thrust from the right proprotor, which sent the MV-22 into an unrecoverable turning descent, according to the accident report.

Bell Boeing MV-22B Osprey. (Janes/Lindsay Peacock)

A fatal 8 June 2022 US Marine Corps (USMC) MV-22 crash in Glamis, California, was traced to dual hard clutch engagement (HCE) in the right engine assembly, according to a report released on 21 July. The accident report found no fault in either aircraft maintenance or the crew's conduct.

The crash killed five marines. The aircraft and crew were assigned to the 3rd Marine Aircraft Wing, based at Marine Corps Air Station Miramar, California, and were conducting low-altitude runs over a gunnery range when the incident happened.

The accident occurred when the right engine clutch, which connects the engine to the proprotor, disengaged and rapidly re-engaged, an occurrence called a hard clutch engagement. The strain from the HCE caused a shaft to shear in the tiltrotor's Single Engine and Interconnect Drive System (Single Engine/ICDS), which connects the two engines together such that one engine can power both proprotors. The Single Engine/ICDS failure resulted in a loss of thrust from the right proprotor, which sent the MV-22 into an unrecoverable turning descent, according to the accident report.

Bell Boeing MV-22B Osprey. (Janes/Lindsay Peacock)

A fatal 8 June 2022 US Marine Corps (USMC) MV-22 crash in Glamis, California, was traced to dual hard clutch engagement (HCE) in the right engine assembly, according to a report released on 21 July. The accident report found no fault in either aircraft maintenance or the crew's conduct.

The crash killed five marines. The aircraft and crew were assigned to the 3rd Marine Aircraft Wing, based at Marine Corps Air Station Miramar, California, and were conducting low-altitude runs over a gunnery range when the incident happened.

The accident occurred when the right engine clutch, which connects the engine to the proprotor, disengaged and rapidly re-engaged, an occurrence called a hard clutch engagement. The strain from the HCE caused a shaft to shear in the tiltrotor's Single Engine and Interconnect Drive System (Single Engine/ICDS), which connects the two engines together such that one engine can power both proprotors. The Single Engine/ICDS failure resulted in a loss of thrust from the right proprotor, which sent the MV-22 into an unrecoverable turning descent, according to the accident report.

Bell Boeing MV-22B Osprey. (Janes/Lindsay Peacock)

A fatal 8 June 2022 US Marine Corps (USMC) MV-22 crash in Glamis, California, was traced to dual hard clutch engagement (HCE) in the right engine assembly, according to a report released on 21 July. The accident report found no fault in either aircraft maintenance or the crew's conduct.

The crash killed five marines. The aircraft and crew were assigned to the 3rd Marine Aircraft Wing, based at Marine Corps Air Station Miramar, California, and were conducting low-altitude runs over a gunnery range when the incident happened.

The accident occurred when the right engine clutch, which connects the engine to the proprotor, disengaged and rapidly re-engaged, an occurrence called a hard clutch engagement. The strain from the HCE caused a shaft to shear in the tiltrotor's Single Engine and Interconnect Drive System (Single Engine/ICDS), which connects the two engines together such that one engine can power both proprotors. The Single Engine/ICDS failure resulted in a loss of thrust from the right proprotor, which sent the MV-22 into an unrecoverable turning descent, according to the accident report.