The Department of Defense (DoD) recently announced that it will officially resume accepting deliveries of the Lockheed Martin F-35 Joint Strike Fighter after a year-long pause caused by software integration challenges.

The first two F-35A Lightning II aircraft equipped with the new Technology Refresh-3 (TR-3) software were delivered last Friday, July 19.

Resuming F-35 Deliveries

After careful deliberation and consultation with military leadership, pilots, maintenance crews, industry experts, and the program’s oversight board, Lieutenant General Mike Schmidt green-lit to accept the F-35s that were equipped with a scaled-back “truncated” version of the latest software, Defense News reported.

Software issues plagued the program, and this phased delivery approach taken by the Pentagon aimed to mitigate risks while ensuring a steady flow of aircraft to the US Air Force and its allies.

The F-35 program’s TR-3 software is an essential upgrade for Block 4, expected to further expand the advanced jet’s capabilities.

“These (TR-3 and Block 4) and further software updates over the life of the program will ensure the F-35 continues to be an effective deterrent and the cornerstone of joint all-domain operations now and decades into the future,” said Bridget Lauderdale, Lockheed Martin’s vice president and general manager of the F-35 Program.

F-35 upgrade
An F-35A Lightning II with Technology Refresh 3 software assigned to the 187th Fighter Wing arrives at Dannelly Field, Alabama. (DVIDS)

The TR-3 Software and its Challenges

Designed to enhance the F-35’s displays, computing power, and overall performance, TR-3 software proved challenging to implement due to software compatibility issues and hardware delays.

As a result, the DoD refused to accept the new F-35s last July and later on began withholding payments of about $7 million per plane, according to Bloomberg, despite production continuing.