You can now read 5 articles in a month for free on Read as much as you want anywhere and anytime for just 99¢.

Problem in Boeing 787 planes still baffles

Joseph Kolly of the NTSB showed part of a burnt battery from a Boeing 787.

Associated Press

Joseph Kolly of the NTSB showed part of a burnt battery from a Boeing 787.

WASHINGTON — Although a fire destroyed one of two big batteries on a Boeing 787 parked at Logan International Airport in Boston three weeks ago, a quick examination of the second battery found ‘‘no obvious anomalies,’’ the National Transportation Safety Board said Sunday.

The second battery was of identical design but used for a different purpose than the first, the agency said. Its report added scattered details to what is known about the incident, one of two battery problems that led to the grounding of all 50 of the 787s in airline service.

Continue reading below

The board said its laboratory was continuing to study the destroyed battery, whose function was to start the auxiliary power unit, a small engine used mostly on the ground. The battery, which was not being charged or discharged, caught fire Jan. 7. The plane was empty.

The undamaged battery on which the board reported Sunday was a backup for cockpit instruments, located near the nose. The board has released photos of the damaged and undamaged batteries.

On Jan. 16, on a different 787 on a domestic flight in Japan, the battery used to back up cockpit instruments began belching smoke a few minutes after takeoff, forcing an emergency landing. Investigators have not said whether it was being charged at the time. The planes were grounded shortly afterward.

The batteries use a lithium-ion chemistry, which has been in use for many years in many applications but is new in airplanes. Investigators say the problem could be the batteries or with the associated electronics used to manage them.

The board said Sunday that at the time of the fire at Logan, the plane, which belonged to Japan Airlines, had completed 22 flights and 169 flight hours.

Loading comments...
Want each day's news headlines delivered fresh to your
inbox every morning? Just connect with us
in one of the following ways:
Please enter a valid email will never post anything without asking.
Privacy Policy
Subscriber Log In

You have reached the limit of 5 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week
Marketing image of
Marketing image of