Delivery schedule of 787s unaffected: ANA

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All Nippon Airways (ANA) says its delivery schedule for Boeing 787 aircraft on order remains unchanged - at least until the completion of investigations into a battery problem that caused an emergency landing.

"At this moment, there are no plans to change the delivery schedule," says an ANA spokesman. "We have to figure out what happened first before we consider any possibility of changing the schedule."

The statement comes after one of the carrier's 787s had to make an emergency landing at Takamatsu airport because of a battery problem on 16 January.

The airline would only say that the affected battery is "one of the main batteries", but it is not able to specify the battery's exact location yet.

The ANA aircraft, with registration JA804A, had to make the emergency landing, after pilots observed an error message related to "battery malfunction". There was also an "unusual smell" in the aircraft cockpit and cabin.

ANA has since grounded its fleet of 17 787-8s for checks, cancelling several flights and using other aircraft types on several other routes.

"The aircraft is to be checked and the cause to be investigated in cooperation with the Japan Transport Safety Board," says the spokesman.

ANA has a further 19 787-8s and 30 787-9s on order.

Japan Airlines, which has a fleet of seven 787-8s, has also confirmed that its 787s will not be used to operate any services on 16 January. Both Japanese carriers could not state how long the aircraft will be grounded for.