Accident NAMC YS-11A-213 JA8729, Sunday 4 November 1979

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Date:	Sunday 4 November 1979
Time:	15:10
Type:	NAMC YS-11A-213
Owner/operator:	All Nippon Airways - ANA
Registration:	JA8729
MSN:	2097
Year of manufacture:	1969
Fatalities:	Fatalities: 0 / Occupants: 70
Other fatalities:	0
Aircraft damage:	None
Category:	Accident
Location:	40 nm E of Kushimoto VOR, Wakayama Prefecture - Japan
Phase:	En route
Nature:	Passenger - Scheduled
Departure airport:	Kochi Airport
Destination airport:	Tokyo International Airport
Investigating agency:	JTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
All Nippon Airways flight 564, a NAMC YS-11A, was en route when the aircraft encountered turbulence, injuring two passengers and two flight attendants.
The "fasten seat belt" sign had been turned. One seriously injured passenger did not have his seat belt fastened and the other had his seat belt loosely fastened. The aircraft encountered turbulence from plus 1.67 g to minus 0.66 g for 6 secs.
There was no damage to the aircraft.

Cause:
It is estimated that this accident was caused by the aircraft encountering strong turbulence that was difficult to predict while flying at cruising altitude.

Accident investigation: