Northrop Grumman, working with the U.S. Air Force, has completed a key flight test of the Stand-in Attack Weapon, or SiAW, validating the missile’s safe separation from an F-16 aircraft, the company announced.
According to a press release from Northrop Grumman, the separation test was conducted recently and focused on confirming flight safety and aerodynamic performance as the missile moves closer to operational integration. The test also supports future plans to integrate SiAW with fifth-generation platforms, including the F-35.
The company said safe separation from the F-16 represents an important milestone for the program and demonstrates growing design maturity of the weapon system. Separation testing is a critical step in weapons development, ensuring that a missile can be released from an aircraft without interfering with the jet’s flight characteristics or damaging the aircraft.
Col. Gary E. Roos, senior materiel leader for the Adaptive Weapons Division at the Air Force Life Cycle Management Center, said the test provides both safety assurance and performance data.
“The separation test of SiAW from the F-16 is intended to provide the United States Air Force validation of the weapon’s safe separation characteristics and also generate invaluable data for optimizing its performance,” Roos said. “The results can reinforce SiAW’s ability to provide a critical advantage to warfighters in the face of evolving threats.”
Northrop Grumman officials described the test as a step that allows the program to move forward with confidence as development continues.
“This milestone is a key step forward for the SiAW program,” said Chuck Johnson, vice president of advanced weapons at Northrop Grumman. “With the insights from the separation test, we will continue missile development and ultimately, deliver a critical capability to the warfighter. Our work ensures the U.S. Air Force will have a highly survivable precision strike weapon that will meet current and future mission needs.”
SiAW is an air-to-ground strike missile designed to engage time-sensitive and high-value targets in contested environments. According to Northrop Grumman, the weapon is intended to expand the range of targets available to the U.S. Air Force, including heavily defended land targets that are difficult to strike with existing systems.
The missile is being developed using digital engineering methods and incorporates open-architecture interfaces. Company says this approach allows for faster upgrades to subsystems, enabling new capabilities to be added as threats evolve without redesigning the entire weapon.
The F-16 separation test is part of a broader integration effort. While the F-16 is a fourth-generation aircraft, it provides a flexible and well-understood test platform for early flight evaluations. Data collected during these tests is expected to support later integration work on stealth aircraft, including the F-35.
Northrop Grumman noted that SiAW is designed to be carried internally by fifth-generation fighters, preserving low-observable characteristics while providing a precision strike option against advanced threats. The company has previously emphasized survivability and adaptability as core design goals for the weapon.
The aircraft involved in the test, the F-16 Fighting Falcon, is manufactured by Lockheed Martin and operated by the U.S. Air Force. The platform continues to play a central role in weapons testing and operational missions due to its performance, availability, and extensive modification history.
SiAW is part of Northrop Grumman’s wider portfolio of advanced weapons, which includes missiles, interceptors, electronics, and weapon components. The company said lessons learned from SiAW development also inform other programs focused on contested-environment operations.