Footage exhibits B-1 experiencing a catastrophic engine failure throughout a floor run-up at Dyess Air Pressure Base, Taylor County, Texas.
The footage on this publish is attention-grabbing. It exhibits what occurred on Apr. 20, 2022, when a U.S. Air Force B-1B Lancer bomber of the seventh Bomb Wing, serial 85-0089, skilled a catastrophic engine failure and hearth on a the #1 engine whereas present process upkeep on the primary ramp at Dyess AFB, Texas. The explosion injured one airman and precipitated injury to the plane price practically 15M USD.
In response to the official investigation report, the incident occurred at 22.16LT, as the upkeep crew, comprised of members from the seventh Plane Upkeep Squadron and the 489th Plane Upkeep Squadron, had been performing routine corrective upkeep, in accordance with technical orders, in response to the malfunctioning #1 engine variable space exhaust nozzle of the mishap plane.
Throughout run-up to most augmenter to confirm appropriate efficiency of the #1 engine variable space exhaust nozzle, the #1 engine catastrophically failed, ejecting its 2nd Stage Fan Disk from the consumption part and severing gas traces, which precipitated a hearth to erupt within the engine. The 2nd Stage Fan Disk continued to fly away from the plane and landed over 5 hundred toes from the MA [Mishap Aircraft]. The MMC [Mishap Maintenance Crew] executed emergency engine shutdown procedures and egressed away from the plane. Emergency crews rapidly responded and extinguished the hearth inside ten minutes.
The supersonic bomber suffered additionally intensive hearth injury to the left nacelle and wing. Particles from the explosion struck one Airman who suffered minor accidents and was handled promptly on the native hospital.
The Accident Investigation Board President discovered by a preponderance of the proof that prime cycle fatigue on the #1 engine’s 2nd Stage Fan Disk was the reason for the accident. Laboratory testing demonstrated that prime cycle fatigue initiated a crack on the floor of the 2nd Stage Fan Disk on the nook of a blade slot and the ahead face of the disk. The crack, as soon as initiated by the stress induced from repeated acceleration and deceleration of the engine, was propagated by a mixture of excessive cycle and low cycle fatigue. The crack and its preliminary progress elevated the stress past the 2nd Stage Fan Disk’s yield power, leaving it vulnerable to low cycle fatigue. The floor crack grew to a depth of roughly 0.7 inches earlier than the 2nd Stage Fan Disk broke aside inflicting the #1 engine to fail catastrophically. The foundation reason behind the excessive cycle fatigue that precipitated the preliminary crack within the 2nd Stage Fan Disk couldn’t be decided. No elements considerably contributed to this mishap.
Though the report by the AIB (Accident Investigation Board) was launched final yr (on Dec. 19, 2022), movies apparently shot by a surveillance IR digital camera in addition to a smartphone on the apron, present the mishap.