Japan Airlines had to replace a Boeing 787-8 aircraft on the Tokyo Haneda-Beijing route after a minor pressure issue was discovered during a ground maintenance check.
After arriving at Haneda from Singapore, the aircraft's (registration JA827J) second scheduled service since JAL resumed 787 operations on 1 June, a maintenance team observed a pressure warning in the aircraft's aft battery compartment, says a company spokesman.
The compartment was opened and it was discovered that a piece of tape that had been part of the testing of the new enclosure had been accidentally left in place.
Meanwhile, the aircraft's planned flight on the Haneda-Beijing route was operated by a Boeing 767-300ER aircraft.
JAL has checked the battery compartments aboard its fleet of 787-8s and found no other incidents of leftover tape. JA827J has also returned to service.
The global fleet of 787s was grounded for several months after lithium-ion battery fires aboard two 787s operated by JAL and All Nippon Airways. Over the month of May, Boeing installed modified batteries and containment systems. The modifications paved the way for the resumption of 787 services.