Boeing Starliner returning to Earth early after mission failure

Boeing's newStarlinerspacecraft will return toEarthon Sunday, six daysearly,aftera clock problem prevented a rendezvous with the International Space Station, NASA and the aerospace giant confirmed Saturday.

The uncrewedStarlinercapsule is now scheduled to land Sunday at 05:47 am at the White Sands Missile Range in New Mexico.

The capsule is currently in a low, 250-kilometreorbit.Boeingengineers are programming it to re-enter the atmosphere over the Pacific Ocean.

Parachutes will slow its descent, and huge airbags will be deployed to cushion its desert landing.

Starliner'sfailurewas the latest serious setback forBoeing, which is still reeling from two fatal crashes of its 737 Max airliner. The crashes, in October 2018 in Indonesia and in March 2019 in Ethiopia, claimed a total of 346 lives.

The aerospace company plans to suspend production of the plane in January.

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Too much propellant burned

TheStarlinercapsule was launched Friday from Cape Canaveral, Florida, but shortlyafterseparating from its Atlas V launch rocket its thrusters failed to activate as planned, preventing it from reaching an orbit high enough to meet up with the ISS.

The space station orbits at an altitude of about 400 kilometres above sea level.

Aftercalculating that the craft had burned too much propellant for several minutes -- owing to a clock problem --Boeingand NASA determined that theStarlinerwould have to return toEarthwithout fulfilling its plannedmission.

Jim Chilton, senior vice president ofBoeing's space and launch division, told reporters that "we started the clock at the wrong time."

The craft, assuming it was at a different stage of its flight, burned much more propellant than it should have.

NASA finds a bright side

The flight,carrying only a dummy into space,was meant to be a final dress rehearsal before a crewed flight.

But NASA Administrator Jim Bridenstine insisted that themissionwas not a completefailure.

"The NASA team and theBoeingteam have been workinghand in glove to accomplish as many of the test objectives as we can," he said.

Thus,Starlinerwas able to establish a communications link with the ISS, and to test in space its docking mechanism as well as its solar panels, batteries, thrusters and heat regulation system.

Chilton said the vehicle's status is "really excellent."

But a major test awaits:Starliner's landing Sunday in the New Mexico desert,one of the most dangerous phases for any spacemission, particularly when the vehicle is designed to transport astronauts.

Starlineris set to re-enter the atmosphere at 25 times the speed of sound. Its thermal shield will have to resist the intense heat created by friction with the atmosphere, and its three parachutes will have to deploy correctly.

In a test in November only two parachutes opened, although they proved sufficient for the landing.

"The entry, descent and landing is not for the faint of heart," Chilton said.

NASA will have to decide whether to carry out another test flight or to trust that the vehicle is safe to carry astronauts.

Starliner's first crewed flight had been scheduled forearly2020 -- no specific date has been announced -- a much-anticipated development ever since NASA sent up its last space shuttle in 2011.

Another vehicle, the Crew Dragon, has been developed by SpaceX corporation for NASA. It is expected to be ready for launch in the next several months.

NASA has committed to pay $8 billion toBoeingand SpaceX, which in return are to deliver six trips carrying four astronauts each from now to 2024.