Pratt & Whitney Accelerates CCA Engine Testing as Raytheon Scales Mk 104 Rocket Motor Production

Two key propulsion programs are advancing in parallel as the U.S. military prepares for next-generation air combat and missile defense. Pratt & Whitney has entered a critical phase of engine testing for the U.S. Air Force’s Collaborative Combat Aircraft (CCA) program, while Raytheon has expanded production of its Mk 104 dual-thrust rocket motor that powers the Navy’s SM-2 and SM-6 interceptors. These developments underscore a broader push to modernize propulsion systems across both manned-unmanned teaming platforms and naval missile arsenals.

Pratt & Whitney’s CCA Engine Enters Rigorous Test Phase

As part of the U.S. Air Force’s Next Generation Air Dominance (NGAD) family of systems, the Collaborative Combat Aircraft (CCA) program aims to field autonomous or semi-autonomous UAVs capable of flying alongside manned fighters like the F-22 and future NGAD platforms. Pratt & Whitney confirmed that it is conducting full-scale engine testing for a powerplant designed specifically for one of the CCA variants.

The company is leveraging its Adaptive Engine Transition Program (AETP) experience—particularly from the XA101 engine developed for sixth-generation fighters—to inform its CCA propulsion design. While specific performance parameters remain classified, officials have emphasized that thrust-to-weight ratio, thermal management capacity, and modularity are key requirements. The engine under test is reportedly a scaled-down or derivative variant optimized for unmanned operation with high fuel efficiency and extended loiter capability.

The tests are being conducted at Pratt & Whitney’s West Palm Beach facility in Florida using specialized test rigs that simulate high-altitude flight conditions. According to company statements and recent USAF budget documents, this phase includes performance validation under variable inlet conditions and stress environments mimicking contested airspace operations.

Collaborative Combat Aircraft Program Timeline and Industry Players

The U.S. Air Force plans to field at least 1,000 CCAs by the early 2030s to augment its shrinking fighter fleet and increase mass in future peer conflicts. The program envisions multiple mission-specific variants—ranging from ISR-focused drones with advanced sensors to strike-capable UCAVs carrying stand-off munitions or electronic warfare payloads.

In August 2024, Boeing, Lockheed Martin’s Skunk Works division, Northrop Grumman Aeronautics Systems, General Atomics Aeronautical Systems Inc., and Anduril were each awarded contracts under the CCA Increment 1 competition. These awards focused on preliminary design work leading toward a downselect in FY2025–2026 for prototype flight demonstrations.

While propulsion providers like Pratt & Whitney are not prime contractors on these efforts, they play a critical role in enabling performance tradeoffs between payload capacity, range/endurance, stealth shaping constraints, and cost per unit—all crucial variables in making CCAs affordable yet effective force multipliers.

Raytheon Ramps Up Mk 104 Rocket Motor Production

In parallel with airborne propulsion advancements, Raytheon has expanded production capacity for its Mk 104 dual-thrust solid rocket motor—the primary booster stage used in Standard Missile-2 (SM-2) Block III/IV and SM-6 interceptors deployed aboard Aegis-equipped surface combatants.

The expansion comes amid rising demand from both domestic U.S. Navy needs and foreign military sales partners such as Japan and Australia who operate Aegis-class destroyers. The increased output will support ongoing procurement under multi-year contracts awarded by Naval Sea Systems Command (NAVSEA), including Lot buys through FY2027.

The Mk 104 provides initial boost followed by sustained flight thrust via two-stage solid propellant grains encased within an aluminum case with integral nozzle assembly. It plays a vital role in enabling long-range engagement envelopes against cruise missiles or maneuvering aerial threats when paired with active radar-guided seekers on SM-series interceptors.

Strategic Implications for U.S. Naval Missile Defense

The Standard Missile family forms a cornerstone of layered maritime air defense architecture alongside Evolved Sea Sparrow Missiles (ESSM) and close-in weapons systems like Phalanx CIWS or RAM launchers. With China increasing its inventory of long-range anti-ship ballistic missiles (ASBMs) such as DF-21D/DF-26B variants—and Russia fielding hypersonic glide vehicles—the Navy is prioritizing interceptor readiness across Indo-Pacific deployments.

• SM-6 Dual I: Offers both anti-air warfare (AAW) and terminal ballistic missile defense capabilities via active seeker homing.
• SM-2 Block IV: Provides area defense against saturation attacks using semi-active radar guidance supported by shipboard illuminators.
• Mk 72 booster + Mk 104 sustainer: Together form the two-stage propulsion stack used across multiple variants depending on mission profile.

An increase in Mk 104 production ensures stockpile replenishment amid high operational tempo—especially given recent transfers of older SM-series rounds to allies like Ukraine under emergency drawdown authorities—and supports future integration with emerging sensors such as SPY-6 radar arrays on Flight III Arleigh Burke-class destroyers.

A Converging Focus on Propulsion Modernization

The simultaneous acceleration of both airborne UAV engines and naval missile boosters reflects broader trends in U.S. military modernization strategy: investing heavily in propulsion technologies that enable distributed lethality across domains without requiring entirely new platforms upfront.

This approach aligns with Pentagon priorities outlined in recent National Defense Strategy documents emphasizing survivability through dispersion; speed through autonomy; and lethality through precision effects—all dependent on robust powerplants capable of supporting extended operations without logistical overreach.

Moreover, industrial base resilience remains a key concern—highlighted by recent DoD assessments identifying solid rocket motor supply chains as fragile due to limited qualified suppliers after mergers like Northrop Grumman’s acquisition of Orbital ATK (now part of Northrop’s Defense Systems sector). Programs like Raytheon’s ramp-up serve dual purposes: meeting near-term demand while sustaining critical manufacturing skills domestically.

Outlook

If successful during current test phases, Pratt & Whitney’s CCA engine could become a reference architecture not only for USAF drones but also export-oriented UCAV designs seeking NATO interoperability standards such as STANAG-compliant powerplants or digital twin-enabled maintenance models via Prognostic Health Management (PHM).

Meanwhile, continued investment into legacy yet adaptable systems like the Mk 104 ensures that existing missile frameworks remain viable well into the next decade—especially when paired with software-defined updates to seekers or data links such as Cooperative Engagement Capability (CEC).