The Federal Aviation Administration is undertaking a comprehensive review of the critical systems of Boeing's 787s, the aircraft maker's newest and most technologically advanced plane, after a fire and a fuel leak earlier this week.

The review will include the design, manufacture and assembly of those systems, the FAA said in a statement Friday. Officials plan to detail the review at a news conference Friday morning.

The FAA statement gave no indication that the agency intends to limit or prohibit the 787 from flying during the review.

New components

The 787, which Boeing calls the "Dreamliner," relies more than any other modern airliner on electrical signals to help power nearly everything the plane does.

It's also the first Boeing plane to use rechargeable lithium ion batteries, which charge faster and can be moulded to space-saving shapes compared to other airplane batteries.

A Boeing official said the company is working with the FAA.

"We are absolutely confident in the reliability and performance of the 787," Boeing spokesman Marc Birtel said. "We are working with the FAA and our customers to ensure we thoroughly understand any introductory issues that arise. While we take each issue seriously, nothing we've seen in service causes us to doubt the capabilities of the airplane."

A fire ignited Monday in the battery pack of an auxiliary power unit of a Japan Airlines 787 empty of passengers as the plane sat on the tarmac at Boston's Logan International Airport. It took firefighters 40 minutes to put out the blaze. Also this week, a fuel leak delayed a flight from Boston to Tokyo of another Japan Airlines 787.

On Friday, Japan's All Nippon Airways reported two new cases of problems with the aircraft. ANA spokeswoman Ayumi Kunimatsu said a very small amount of oil was discovered leaking from the left engine of a 787 flight from southern Japan's Miyazaki airport to Tokyo.

The jet returned to Miyazaki, but after checks found no safety risk it flew to Tokyo. ANA said on another flight, to Matsuyama on the island of Shikoku, glass in a cockpit window cracked and the aircraft was grounded for repairs.

Boeing has insisted that the 787's problems are no worse than what it experienced when its 777 was new in the mid-1990s. That plane is now one of its top-sellers and is well-liked by airlines.