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Time of
Observation
11:00 JST 11:20 JST 11:36 JST 12:00 JST 12:38 JST 13:00 JST
Wind Direction
140
degrees
140
degrees
130
degrees
140
degrees
130
degrees
130
degrees
Wind Speed 28 kt
28 kt
(Gust
39kt)
28 kt 28 kt
29 kt
(Gust
42kt)
28 kt
Visibility
More
than10km,
light rain
6 km,
rain
8 km
Light rain
More
than10km,
light rain
4.5 km,
rain
6 km
rain
Cloud amount 1/8 1/8 1/8 1/8 1/8 1/8
Cloud type stratus stratus stratus stratus stratus stratus
Height of cloud
base
600 ft 600 ft 600 ft 500 ft 500 ft 500 ft
Cloud amount 5/8 5/8 5/8 5/8 5/8 5/8
Cloud type stratus stratus stratus stratus stratus stratus
Height of cloud
base
900 ft 900 ft 900 ft 900 ft 900 ft 900 ft
Cloud amount 7/8 7/8 7/8 7/8 7/8 7/8
Cloud type stratus stratus stratus stratus stratus stratus
13
Height of cloud
base
2,000 ft 1,800 ft 2,000 ft 2,000 ft 2,000 ft 2,000 ft
Temperature 7°C 6°C 7°C 7°C 7°C 7°C
Dew point 4°C 4°C 4°C 4°C 5°C 5°C
QNH 30.00 inHg
29.99 inHg
P/FR
29.97 inHg
29.94inHg
P/FR
29.92 inHg 29.91 inHg
2.7.3 Airport Gale Warnings, etc.
(1) Airport Forecast
The Airport Warning issued by the Hakodate Airport branch of the Meteorological
Agency’s Hakodate Oceanic Meteorological Office at 09:00 was as follows:
TAF RJCH 210000Z 210009 11025G35KT 6000 -RA FEW005 BKN012 BKN025
TEMPO 0003 11030G50KT 3000 RA.BR FEW003 BKN008 BKN018
TEMPO 0309 11030G50KT 2000 +RA BR VV005
(2) Airport Gale Warning
The Airport Gale Warning relating to strong wind issued by the Hakodate Airport
branch of the Meteorological Agency’s Hakodate Oceanic Meteorological Office at 11:40 were
as follows:
From now until 21 January 15:00 UTC, the south east wind will have a maximum speed
of between 35 and 40kt with gusts of up to 50 to 60kt. Thereafter, the wind will weaken
gradually.
2.8 Information related to Aeronautical Navigation Aids
2.8.1 Information related to Aeronautical Radio Navigational Aids
As a result of the inspections following the accident, no abnormalities were found in
aeronautical radio navigation aids including Hakodate VOR (VHF Omni-Directional Radio
Range) and the Hakodate Airport runway 12 Category I ILS.
2.8.2 Information related to Aeronautical Lighting
Hakodate Airport is equipped with lightings for Category I precision approaches, and all
lights are normal. And at the time of accident, according to the aeronautical meteorological
special report at 13:38 on January 21, 2002, these aeronautical lights were illuminated at
maximum brightness.
14
2.9 The Accident Site
Hakodate Airport is located around 7km East of Hakodate City. To the south of the
airport is the Tsugaru Channel to the south side of the airport, and to the north and east are
residential areas backed by mountains. The approach route leading up to the point of the
accident is to the west side of the airport, and proceeds from Hakodate City to the runway
passing over the Yunokawa Onsen hot spring. Along this approach route, the elevation is
around 4m in the vicinity of Hakodate City, and rises gently from the Matsukura River
around 1,000m west of the west side of the runway to an elevation of 111.9ft (34.1m) at the
airport. The elevation of the touchdown point of runway 12 is 103ft.
The runway runs almost parallel to the coastline, and is 3,000m long and 45m wide and
grooved along its full length. The distance from the south edge of the runway to the coast is
around 700m at the approach end threshold of the runway 12 and around 850m at the
departure end threshold. Further, the distance to the coastline is around 1,000m at a point
approximately 600m from the runway 12 departure threshold along the runway extended
centreline in the direction of departure. From a further 500m from this point along the
extended centreline, the coastline makes 50° turn in the direction of runway 12 and is
engulfed by the surrounding land area in the manner of an inlet.
The whole airport region is like an elevated plateau above the surrounding area. While
its slope ascends gradually from the coast for around 100 – 150 m, beyond that the slope
angle becomes 30 –45° and rises to around the same elevation as the airport.
The site of the accident was over the runway 12 end markings. Silver metallic traces
around 15.9 m long and with a maximum width of around 80 cm remained after the accident,
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