Date:	Wednesday 16 February 2000
Time:	12:43
Type:	NAMC YS-11A-213
Owner/operator:	ANK- Air Nippon
Registration:	JA8727
MSN:	2095
Year of manufacture:	1969
Total airframe hrs:	53347 hours
Engine model:	Rolls-Royce Dart 543-10J/K
Fatalities:	Fatalities: 0 / Occupants: 41
Aircraft damage:	Destroyed, written off
Category:	Accident
Location:	Sapporo-Okadama Airport (OKD) -   Japan
Phase:	Landing
Nature:	Passenger - Scheduled
Departure airport:	Hakodate Airport (HKD/RJCH)
Destination airport:	Sapporo-Okadama Airport (OKD/RJCO)
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
The YS-11 overran runway 14, and ran into the snow bank located on the right side of the runway overrun area causing damage to the landing gear, propeller and front fuselage.

PROBABLE CAUSE: "When the a/c tried to land on the snow covered rwy, it passed over the rwy threshold with speed of 23 kts above target threshold speed (tts). The a/c touched down further away from the touch down zone with high speed. This resulted in overrun from the rwy, collision with the snow bank and substantial damage to the a/c."

CAUSAL FACTORS:
a) high air speed at the rwy threshold, 23 kts above tts.
b) extended landing roll distance due to the following factors:
1) higher touch down speed.
2) due to higher touch down speed, time elapsed before the propeller ground fine pitch effect became positive.
3) the rwy covered with snow was slippery and braking was not effective enough to stop the a/c within the rwy.
c) the flight crew failed to execute go-around even though they had chances to do so during such time frame as:
1) guidance limit to da.
2) passing over the rwy threshold with higher-than-tts air speed; and
3) making an elongated touch down.
d) it was estimated possible that then meteorological conditions affected the proper operations of the a/c.
e) insufficient flight crew coordination such as:
1) air speed monitor by the pnf.
2) standard call-out procedure by the pf and the pnf; and
3) close coordination between the captain and the cockpit.

ICAO Adrep Summary 2/00 (#74)
ICAO File : 00000380

photo (c) JTSB; Sapporo-Okadama Airport (OKD/RJCO); February 2000

photo (c) JTSB; Sapporo-Okadama Airport (OKD/RJCO); February 2000

photo (c) via Werner Fischdick; Tokyo-Haneda Airport (HND); October 1976

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