Seemingly back on track toward a Tuesday liftoff, the Firefly Aerospace Alpha rocket team instead scrubbed the launch attempt for the second day in a row at Vandenberg Space Force Base, but will try for a Wednesday departure.

“We are standing down for today’s Alpha Flight 7 launch attempt after the team saw some off-nominal readings during fluids loading,” Firefly officials said Tuesday. “We continue to be intentionally cautious with a focus on quality and reliability leading up to this test flight.”

On Wednesday, Firefly confirmed that after running additional tests on the fluids system they would aim for liftoff during a two-hour window that will open at 5:50 p.m.

A livestream of the countdown will begin about 20 minutes before liftoff and can be found by clicking here.

Tuesday marked the second delay in a row for the departure of the Alpha rocket which stands 96.7 feet tall.

On Monday, Firefly officials delayed the departure to investigate an out-of-range sensor reading. 

By Tuesday afternoon, Firefly said the employees had completed testing and verified nominal readings for all sensors.

At the start of the month, the team had to await favorable weather after upper-level winds exceeded safety limits. 

The Stairway to Seven mission will serve as a demonstration flight to prove the first- and second-stage boosters perform as planned.

Firefly also intends to test some features that will appear on the upgraded Alpha rocket for the program’s eighth liftoff.  

That Block II configuration will include a 7-foot increase to Alpha’s length, consolidated batteries and avionics built in house, an enhanced thermal protection system, and stronger carbon composite structures built with automated machinery.

Texas-based Firefly created Alpha to carry smaller payloads for national security, commercial and civil missions.