Incident Boeing 787-9 Dreamliner A4O-SH, Wednesday 18 October 2023

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Date:	Wednesday 18 October 2023
Time:
Type:	Boeing 787-9 Dreamliner
Owner/operator:	Oman Air
Registration:	A4O-SH
MSN:	38894/785
Year of manufacture:	2018
Fatalities:	Fatalities: 0 / Occupants: 161
Other fatalities:	0
Aircraft damage:	None
Category:	Incident
Location:	77.5 nm W of Muscat - Oman
Phase:	En route
Nature:	Passenger - Scheduled
Departure airport:	Muscat International Airport (MCT/OOMS)
Destination airport:	Paris-Charles de Gaulle Airport (CDG/LFPG)
Investigating agency:	OTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
Oman Air flight WY131, a Boeing 787-9 Dreamliner, took off from runway 08L at Muscat Airport and routed to point IVETO, LOPIL and thereafter point ITRAX during its climb to the cruising level. The aircraft encountered turbulence during climb and some of the cabin crew got injured during the turbulence and glasses and plates fell down and broke. The aircraft cleared turbulence and continued with the flight and landed safely at destination airport LFPG.
Three cabin crew members suffered minor injuries.

Probable cause of the incident
The flight crew operating flight WY131 with registration marks A4OSH entered clouds and experience severe turbulence without preparing the cabin crew and passengers for turbulence, as a results some cabin crew members suffered minor injuries as they were not safely secured during turbulence.

Contributory Factors
1 The flight crew switched the seat belt sign-on well in advance, however omitted to follow Oman Air procedure which required PA Announcement to Passengers and Cabin Crew.
2 At the time the flight crew switched the seat belt sign-on at approximately 12800 feet, the CD omitted to follow Oman Air Procedure to enquire from the PIC, about the level of turbulence and duration in order to prepare the cabin.
3 The crew resource management was found to be lacking between the CD and Flight Crew.

Accident investigation: