The Japanese carrier, known as ANA, is also likely to use the Dreamliner initially for cargo flights once the new battery system is installed, to reassure the public about safety before restarting passenger flights, one of the sources said.
Regulators grounded all 50 Dreamliners in use by airlines worldwide in mid-January after lithium-ion batteries overheated on two separate aircraft, on a Japan Airlines jet parked at Boston's Logan airport and on an ANA flight in Japan. ANA operates 17 of the carbon-composite jets and has cancelled more than 3,600 flights through the end of May.
Anticipating regulatory clearance, ANA will put its roughly 200 Dreamliner pilots through flight resumption simulator training so that they will be ready to fly the jets again in June, the sources with knowledge of ANA's operations said.
Since the Dreamliner was grounded, the pilots have been undergoing simulator training every month, but their next training will be specifically for flight resumption, the sources said. The training will start around mid-April, one of the sources said.
"The company is making as many assumptions as it can and is preparing based on them. In order to resume flights from June, it needs all 200 of the pilots ready to be flying by then," a source said.
The sources declined to be identified because they were not authorized to speak publicly about the matter.
Without having found what caused the battery incidents in January, Boeing last month unveiled a new battery system and predicted the 787 could be back in the air within weeks, which drew scepticism from some experts and regulators.
ANA said last week that it was including Dreamliner jets in its June flight schedules.
"It's not that we have decided to resume flights, but rather that we have not decided on canceling flights," spokesman Ryosei Nomura told Reuters.
He added that he had not heard anything about the flight resumption simulator training.
Boeing Tests
Boeing is conducting ground and flight tests to check the new lithium-ion battery system that it plans to install in the Dreamliner jets. The results will be submitted to the U.S. Federal Aviation Administration , which will decide whether to certify the fix.
"More than half of the testing is complete with the remaining ground and flight tests set to occur within the next several days," Marc Birtel, a spokesman for Boeing, told Reuters by email.
Boeing is planning to conduct one more test flight, and the data collected from the flight will be submitted to the FAA . Once the FAA certifies the fix, Boeing will have its engineers install the new battery system in the grounded jets.
"Our baseline plan is to deliver the new battery systems in roughly the same order as initial deliveries," Birtel said.
ANA, as the launch customer, will be the first to have its jets fixed.
It is still unclear how long the FAA will take to approve Boeing 's battery fix. After the FAA 's certification, Japan's Civil Aviation Bureau is likely to certify the fix around the same time.
The U.S. National Transportation Safety Board, which is investigating the Dreamliner's battery trouble, is conducting a two-day forum on April 11-12 to examine the design and performance of lithium-ion batteries in transportation, as well as a separate hearing on April 23-24 on the 787 battery.
The NTSB is likely to make non-binding recommendations to the FAA at the end of an investigation. The two agencies work closely together.
Cargo Flights
A few dozen Boeing engineers are already in Japan so that they can start work on the battery fix as soon as approval is received, the sources said. ANA estimates it may take a month to install the new battery system for its 787 fleet.
Once the new systems are installed, ANA is
