Lockheed Martin proposes to use different engines in fifth-generation F-35 Lightning II fighters, although this would result in billions in additional costs

We wrote that Greg Ulmer, Lockheed Martin's executive vice president, has advocated that the F-35 aircraft get an adaptive engine instead of an upgrade. Such a solution has a drawback, but the top executive has found a solution.

Here's What We Know

The US Air Force decided to keep the adaptive engine, which is being developed under the Adaptive Engine Transition Program (AETP), for the sixth-generation fighter jet. One reason was that the new propulsion system was incompatible with the F-35B, which has a short takeoff and vertical landing.

Greg Ulmer believes that international operators of the F-35 will be free to choose which engine to use. For example, the Royal Air Force ordered only the F-35B, so they will have no choice but to equip the aircraft with an upgraded F135 propulsion system. Countries that have ordered the F-35A will have a choice between the F135 and the AETP.

To be honest, it is hard to believe that the Pentagon would make such a decision. Additional infrastructure would be needed to support more than one engine type. That said, Ulmer said it is the new capabilities that an adaptive engine would bring that should be a priority.

Another reason why the Pentagon is unlikely to agree to develop two projects in parallel is the cost. The cost of developing the AETP was also one of the factors why the adaptive engine was retained for the sixth-generation fighter.

The AETP programme could get nearly $590m in extra funding in fiscal 2024, with Greg Ulmer saying $150m would be enough to keep the project going until next year. By then, the Joint Program Office will decide on requirements for future F-35 propulsion system.

Source: Breaking Defense