On April 14, 1999, about 1500 Pacific daylight time, an ICA-
Brasov IS-28B2, N843, registered to and operated by the pilot as
a public use instructional flight, collided with power lines
while on approach to a private airstrip near North Plains,
Oregon. Visual meteorological conditions prevailed and no flight
plan was filed. The glider was substantially damaged. The flight
instructor received minor injuries, while the pilot-rated
passenger, also a flight instructor, was not injured.  The
purpose of the flight was a currency check for the pilot-rated
passenger. The pilot-in-command (PIC) reported that the winds
were from the northeast at 15 knots, gusting to 20 knots. The
parallel runways are oriented in an east/west direction. At the
west end, a road runs perpendicular to the runways, with tall
fir trees on the west side of the road, and power lines (about
30 feet in height, and three strands) run along the road on the
east side. Normal operations are to take off to the east on the
north runway, and land to th