[Peetwo]

WOW! Popinjay produces a short investigation report inside 8 months?? - 

Via PJ HQ, attributed to this week's Director Transport Safety Kerri Hughes:

Trans-Tasman engine failure event highlights benefits of effective decision making



A 737 flight crew’s response to an engine failure over the Tasman Sea earlier this year highlights the benefits of effective decision-making and management of an unexpected situation, an Australian Transport Safety Bureau investigation notes.

During a scheduled passenger flight from Auckland to Sydney on 18 January 2023, the left engine of a Qantas-operated Boeing 737-838 shut down uncommanded.

In response, the flight crew declared a MAYDAY to prioritise communications with air traffic control, and to ensure they were cleared for an immediate descent from 36,000 ft to 24,000 ft.

The left engine could not be restarted in-flight, and the flight crew conducted an uneventful single-engine landing at Sydney Airport about an hour later.

“A subsequent engine teardown inspection identified separation of the radial driveshaft in the engine’s inlet gearbox, which resulted in a mechanical discontinuity between the engine core and accessory gearbox,” ATSB Director Transport Safety Kerri Hughes said.

“Loss of drive to the accessory gearbox resulted in a loss of fuel pump pressure and uncommanded shutdown of the engine.”

At the time of the engine failure, the aircraft was around 150 km closer to Norfolk Island than it was to Sydney Airport. However, a diversion to Norfolk Island would have required a deviation from the aircraft’s current track, and Norfolk Island presented changeable weather and operational conditions.

“In contrast, Sydney Airport was on the aircraft’s direct route, had favourable weather conditions forecast, had an extensive emergency response, and a straight-in approach on a very long runway,” Ms Hughes noted.

“The decision to continue to Sydney ensured no additional risk was added to an already high workload situation.”

Separately, the report notes that the aircraft’s cockpit voice recorder was inadvertently overwritten during maintenance activities after the aircraft arrived at Sydney.

Since the occurrence, Qantas has enhanced its procedures to prevent inadvertent overwriting of cockpit voice recorders and flight data recorders.

Read the report: Engine failure involving a Boeing Company 737-838, VH-XZB en route from Auckland, New Zealand to Sydney, New South Wales, on 18 January 2023.

Publication Date
03/08/2023

Plus via Oz Aviation: https://australianaviation.com.au/2023/0...obe-finds/

...The report also separately revealed how the aircraft’s cockpit voice recorder was inadvertently overwritten during maintenance activities after the aircraft arrived in Sydney.

Since the occurrence, Qantas has enhanced its procedures to prevent inadvertent overwriting of cockpit voice recorders and flight data recorders.

Qantas will now ensure that when a request is received to secure the cockpit voice recorder and/or flight data recorder, the following steps are to be carried out:

• Immediately notify the duty technical manager to raise a task in the maintenance software to have the requested item quarantined (or at a minimum, power to the recorders is to be removed).
  
• Follow up with a telephone call to the respective port and ensure the ground engineer is advised of the limited timeframe to secure the data.
  
• Continually follow up with the applicable ports until positive confirmation of the requested action has been confirmed.
  

Hmm...wonder if the Qantas crew simply didn't contemplate that the ATSB would want to actually review the CVR recordings because normally they just copy & paste the internal Qantas SMS investigation report?? -   

MTF...P2