Boeing confirmed Thursday that two of the five flight test 787s are on the ground having their horizontal tails fixed.

Boeing confirmed Thursday that two of the five flight test 787s are on the ground having their horizontal tails fixed.

Dreamliners No. 1 and 3 are being re-worked following discovery of poor quality workmanship in some 787 horizontal tails assembled by Boeing’s Italian partner Alenia. All 25 of the tails so far delivered had to be inspected — Boeing hasn’t said how many will require repairs.

The fix on both flight test planes is expected to be completed in the coming days. Dreamliner No. 3 is due to go to the Farnborough Air Show for the Dreamliner’s European debut in just over a week.

Dreamliner No. 2 is currently on the ground for planned maintenance and configuration upgrades. If No. 3 were not ready to fly to Farnborough, No. 2 could be used, said 787 spokeswoman Yvonne Leach.

Dreamliner No. 4 is flying in California. Dreamliner No. 5, the first one with GE engines, is flying out of Boeing Field.

The status of the flight test fleet was first reported Wednesday evening on the Flightblogger website of Flight International magazine.