Embraer EMB-145 suffers runway excursion after landing at Maputo, Mozambique

Embraer EMB-145 suffers runway excursion after landing at Maputo, Mozambique

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Report: Corrosion cracking caused Korean Air Boeing 777 main gear axle failure on landing

Report: Corrosion cracking caused Korean Air Boeing 777 main gear axle failure on landing

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Airbus A220 PW1500G engine failures prompt inspection AD

Airbus A220 PW1500G engine failures prompt inspection AD

The FAA issued an airworthiness directive (AD), requiring initial and repetitive inspections on certain Pratt & Whitney geared turbofan engines following two recent incidents.

The first inflight shutdown occurred on July 25, 2019 and the second occurred on September 16, 2019. In both cases, the aircraft involved was a Swiss International Air Lines Airbus A220-300 with Pratt & Whitney PW1524G-3 engines.
These inflight shutdowns were due to failure of the low-pressure compressor (LPC) stage 1 rotor, which resulted in the rotor disk releasing from the LPC case and damaging the engine.

To prevent recurrences, the FAA requires initial and repetitive borescope inspections of the LPC inlet guide vane (IGV) and the LPC stage 1 rotor and, depending on the results of the inspections, replacement of the LPC.

Although these incidents occurred on PW1524G-3 model turbofan engines, the FAA is including PW1900 engines because similarities in type design make these engines susceptible to the same unsafe condition. The required inspections have to be performed within 50 flight cycles from September 26, and thereafter at intervals not to exceed 50 flight cycles until the engine accumulates 300 flight cycles.

The investigation into both incidents has been delegated to the NTSB.

Parts from the low-pressure compressor stage 1 rotor in the July 25 incident

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DHC-8 failed to rotate due to underestimated mass and distribution

DHC-8 failed to rotate due to underestimated mass and distribution

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NTSB issues 7 safety recommendations to FAA related to Boeing 737 MAX crash investigations

NTSB issues 7 safety recommendations to FAA related to Boeing 737 MAX crash investigations

The NTSB issued seven safety recommendations to the Federal Aviation Administration (FAA) as part of their support in the investigations of two Boeing 737 MAX accidents.

The NTSB is supporting the investigation of Lion Air flight 610 that crashed in the Java Sea following a loss of control after takeoff and the crash of Ethiopian Airlines flight 302 under similar circumstances.

The seven safety recommendations issued to the FAA are derived from the NTSB’s examination of the safety assessments conducted as part of the original design of Boeing’s Maneuvering Characteristics Augmentation System (MCAS) on the 737 MAX and are issued out of the NTSB’s concern that the process needs improvement given its ongoing use in certifying current and future aircraft and system designs.

The NTSB notes in the report that it is concerned that the accident pilots’ responses to unintended MCAS operation were not consistent with the underlying assumptions about pilot recognition and response that were used for flight control system functional hazard assessments as part of the Boeing 737 MAX design.

The NTSB’s report further notes that FAA guidance allows such assumptions to be made in certification analyses without providing clear direction about the consideration of multiple, flight-deck alerts and indications in evaluating pilot recognition and response. The NTSB’s report states that more robust tools and methods need to be used for validating assumptions about pilot response to airplane failures in safety assessments developed as part of the U.S. design certification process.

The seven recommendations issued to the FAA urge action in three areas to improve flight safety:

  • Ensure system safety assessments for the 737 MAX (and other transport-category airplanes) that used certain assumptions about pilot response to uncommanded flight control inputs, consider the effect of alerts and indications on pilot response and address any gaps in design, procedures, and/or training.
  • Develop and incorporate the use of robust tools and methods for validating assumptions about pilot response to airplane failures as part of design certification.
  • Incorporate system diagnostic tools to improve the prioritization of and more clearly present failure indications to pilots to improve the timeliness and effectiveness of their response.

NTSB investigators continue to assist the KNKT and AAIB in their ongoing investigations. The NTSB has full access to information from the flight recorders, consistent with standards and recommended practices for the NTSB’s participation in foreign investigations.

The KNKT’s accident report is expected to be released in the coming months, and their analysis of the Lion Air accident may generate additional findings and recommendations.

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Disconnected nosegear torque link assembly caused Cessna 750 aborted takeoff accident, Cork, Ireland

Disconnected nosegear torque link assembly caused Cessna 750 aborted takeoff accident, Cork, Ireland

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Thai Cessna 208 Caravan rain making plane crashed during training flight, killing two

Thai Cessna 208 Caravan rain making plane crashed during training flight, killing two

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Loss of situational awareness factor in near collision of two Caravans at Sibson, U.K.

Loss of situational awareness factor in near collision of two Caravans at Sibson, U.K.

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Cessna 208B Grand Caravan crashed in Serengeti National Park, Tanzania, killing two

Cessna 208B Grand Caravan crashed in Serengeti National Park, Tanzania, killing two

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Boeing 787-9 went around at Melbourne after ATC noticed landing gear was not down

Boeing 787-9 went around at Melbourne after ATC noticed landing gear was not down

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