Sierra Nevada Corp. filed a lawsuit Tuesday seeking the reinstatement of a light air support contract from the Air Force.
The suit was filed with the U.S. Court of Federal Claims.
The action is in response to a lawsuit filed by Hawker Beechcraft following its disqualification in the competition.
The Air Force set aside the contract to Sierra Nevada in March, opened an investigation into the source selection process and reopened the competition.
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“The cancellation of the contract was an extreme response to what appears to be paperwork errors on the part of the USAF,” Sierra Nevada said in a statement.
Sierra Nevada alleges the revised Request for Proposal is “tilted in favor of the competition.”
The company has not received adequate explanation or justification for the contract’s termination, it said.
Sierra Nevada has partnered with Brazil-based Embraer to offer the Super Tucano to the Air Force.
Hawker Beechcraft’s bid is for the AT-6, an upgraded T-6 trainer used to train Air Force and Navy pilots.