The Air Force hopes to get another 25 years out of its B-52 Bomber fleet but it’s running into some cost, scheduling and performance challenges.

The B-52 was first introduced in 1955 and the Air Force is hoping that a series of updates can keep the fleet in the air until 2050. It intends to spend $21 billion to improve the engines, radar, communications, software and weapon systems for the more than 70 B-52s still in service.

The Air Force already has the B-1 and B-2 along with the in-development B-21, but it said the B-52 still remains critical to the U.S.’s ability to deploy nuclear capabilities. Plus, it can fly nearly 9,000 miles without refueling and carry up to 70,000 pounds.

However, the U.S. Government Accountability Office (GAO) found that the Commercial Engine Replacement Program (CERP), which represents the bulk of modernization costs, has increased by about $3 billion since a 2023 estimate, and initial operational capability has been delayed more than 15 months. While 10 out of the 13 B-52 modernizations experience challenges, the GAO said the Air Force still wants to proceed with engine production before critical flight testing is completed.

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