Boeing conducted a preliminary 787 test flight Monday as it prepares to certify the fix proposed for the jet’s lithium ion battery system.

The jetmaker flew an undelivered 787 built for LOT Polish Airlines for the two-hour flight, hugging the coastline of Washington state and Oregon for most of the trip.

The flight was a normal Boeing production check flight intended to validate that all systems function as designed.

Later this week, Boeing will follow up with a formal certification flight, intended to demonstrate to the Federal Aviation Administration that the new battery system performs as intended during flight conditions.

Unlimited Digital Access. $1 for 4 weeks.

Also Monday, the National Tranportation Safety Board announced a two-day forum in Washington, D.C., on April 11-12, to examine the use of lithium ion batteries in transportation.

Dominic Gates: (206) 464-2963 or