Principal Systems Engineer

Honeywell Aerospace is seeking an experienced Principal Systems Engineer specializing in Environmental Control System (ECS) modeling and analysis. This role focuses on developing and validating ECS system‑level models with an emphasis on steady state performance, thermodynamics, and aircraft environmental/thermal management. The ideal candidate will bring deep technical expertise and the ability to drive system‑level analysis that supports design, integration, and customer requirements.

Key Responsibilities: 

• Lead the creation, enhancement, and maintenance of ECS system‑level models for steady‑state performance prediction, trade studies, and design optimization
• Conduct system architecture studies, evaluating alternative ECS configurations, subsystem interactions, load paths, and integration strategies.
• Perform thermodynamic and fluid‑flow analysis of air cycle systems, air‑conditioning packs, bleed air systems, PTMS, NGS, and related ECS subsystems.
• Demonstrate strong expertise in VCS modeling and analysis through steady‑state model development, architecture trade studies, component‑to‑system integration assessments, and data‑driven design insights
• Serve as the proposal technical lead, defining system performance baselines, assessing technical risks, and identifying value‑engineering opportunities for new business pursuits.
• Conduct steady‑state simulations across environmental, load, and failure scenarios, and define system operating points, boundary conditions, and performance criteria aligned with aircraft requirements.
• Generate clear engineering recommendations that support decisions for system architecture, component sizing, control strategies, and integration.
• Support component and subsystem teams with analytical inputs, performance sensitivities, and system‑level impact assessments.
• Interface with internal and external customers to present results, participate in technical reviews, and justify analytical methods.
• Validate steady‑state models through correlation with test data and support verification and validation strategy development.
• Mentor junior engineers and contribute to advancing ECS modeling tools, methods, and best practices.
• Ensure compliance with Honeywell engineering processes, aerospace standards, and program deliverables.

Qualfications: 

• Bachelor’s degree in Mechanical Engineering, Aerospace Engineering, or a related technical field (Master’s or PhD preferred).
• 10–15+ years of experience in aerospace systems engineering, thermal systems, or ECS‑related analysis.
• Strong foundation in thermodynamics, heat transfer, and fluid mechanics.
• Proficiency with system‑level modeling tools such as VBA, Fortran, MATLAB/Simulink, or equivalent.
• Demonstrated experience in steady‑state system analysis, performance prediction, and trade studies.
   
• Experience with aircraft ECS, thermal management systems, air cycle systems, or vapor cycle systems.
• Familiarity with aircraft‑level requirements, safety analyses, and system integration.
• Proven ability to lead cross‑functional technical efforts and drive analytical strategy.
• Strong communication skills for conveying complex technical information to diverse audiences.

Pay Equity Language: 

Due to compliance with U.S. export control laws and regulations, candidate must be a U.S. person, which is defined as, a U.S. citizen, a U.S. permanent resident, or have protected status in the U.S. under asylum or refugee status. 

Export Compliance Language: 

The annual base salary range for this position is $154,000 - $192,000. Please note that this salary information serves as a general guideline. Honeywell considers various factors when extending an offer, including but not limited to the scope and responsibities of the position, the candidate's work experience, education and training, key skills, as well as market and business considerations. 

About us:

Join a company that's reintroducing itself to the aviation community we've helped advance for more than a century. At Honeywell Aerospace (NASDAQ: HONA), we're launching as an independent, publicly traded aerospace and defense company built on a legacy of operational excellence and mission-focused execution. 

Our new brand identity pairs that heritage with real momentum, as we build technology that helps pilots navigate with confidence, aircraft operate more efficiently, and operators stay ahead of change. With our systems on board 90% of the world's aircraft, your work here has reach that's rare to find anywhere else.

Focusing on our customers, investing in innovation, and building a culture of accountability and performance is how we're shaping what comes next.

Every horizon. Every mission. Every day.

Benefits:

Beyond a performance-driven salary, you'll work alongside dedicated experts on technology that's advancing aviation. As a Honeywell Aerospace employee, you're eligible for a comprehensive benefits package that includes:

• Employer-subsidized medical, dental, vision and life insurance
• Short-term and long-term disability coverage
• 401(k) match, flexible spending accounts and health savings accounts
• Employee assistance program and educational assistance
• Parental leave and 12 paid holidays
• Paid time off for vacation, personal and sick time

Explore your benefits: https://honeywellaerospacebenefits.com/

Honeywell Aerospace products and services are found on aircraft across commercial aviation, defense and space — from engines and cockpit electronics to cabin systems, mechanical components and connectivity solutions. Our technology helps operators fly more safely, reduce fuel consumption, improve on-time performance and deliver a better experience for the people on board. 

As aviation continues to evolve, we're also developing systems to support autonomous and supersonic platforms, bringing the same focus on safety and efficiency to the next era of flight. With approximately 36,000 employees worldwide and net sales of $17.4B in 2025, Honeywell Aerospace is one of the largest dedicated aerospace companies in the world. Explore our businesses: https://www.honeywellaerospace.com

Engines & Power Systems provides the propulsion, auxiliary power and electrical systems that keep aircraft flying. With engines across roughly 120 aircraft types and more than 47,000 APUs in service today, we support operators across commercial and defense markets — backed by an aftermarket network built for the long service life of every platform we power.