NASA's Boeing Starliner is scheduled to launch third manned test flight on June 5 after experiencing power supply issues during the countdown

New Delhi: Boeing's Starliner is scheduled to make a third attempt at its manned test flight on June 5, NASA announced Monday.

“NASA's BoeingSpace Crew Flight Test mission teams are preparing to support a launch on June 5 at 10:52 a.m. ET,” NASA said in a post on

Reason for the termination of the second attempt on 1 June

The mission's second attempt on June 1 was aborted at the last minute. NASA said the attempt was aborted because mission officials at United Launch Alliance (ULA) “discovered a problem with a single ground power supply that was experiencing problems during the countdown.”

The ULA team found the power supply in one of the three redundant chassis that provides power to a subset of computer boards that control various system functions. They also identified the board responsible for the stable refill valves for the Centaur upper stage. All three chassis must enter the final phase of the launch countdown to ensure crew safety.

“On Sunday, the chassis containing the defective ground power system was replaced and ULA confirmed that all hardware is functioning normally,” NASA said.

The company has suffered a series of setbacks. The first manned mission, scheduled to launch on May 7, was aborted two hours before liftoff due to a valve problem on the upper stage of ULA's Atlas V rocket.

After the abort, the launch was rescheduled to May 10, and later to May 21, and then May 25 due to a helium leak. Meanwhile, the company also has a “backup launch opportunity on June 6.” The spacecraft will carry NASA astronauts Butch Wilmore and Indian-born Sunita Williams to the space station for about a week before returning to Earth aboard the reusable crew capsule. The Starliner mission aims to carry astronauts and cargo to low Earth orbit and beyond for future NASA missions.