Boeing Co 747-438, VH-OJE

After a Boeing 747 had landed on runway 34L the crew was
instructed to taxi via runway 25 and taxiway Yankee (Y). Jeppesen
Sydney terminal chart 10-9, dated 18 December 1998, was used to
provide taxi guidance to the crew. That chart depicted taxiways G3
and Y leading off to the north of runway 25. However, the chart was
ambiguous in that there was another letter "Y" displayed to the
south of runway 25. The crew interpreted taxiway G3 to be taxiway Y
on the basis of that information. The crew subsequently turned the
aircraft onto taxiway G3, which was closed. The aircraft was then
stopped until cone markers and unserviceability lights, which
marked taxiway G3, had been removed.

The taxiway system in that area of the airport had been
undergoing significant changes. A Notice to Airmen (NOTAM) had been
issued advising that taxiway G3 was only available during daylight
hours. The end of daylight had occurred 29 minutes before the
incident.