Aircraft Modification & Certification Engineering
Project Engineering Services
STS Engineering Solutions supports aircraft engineering design, seamless integration and regulatory certification for nearly any modification to airframes or components. From concept through compliance, we move fast, execute with precision and eliminate unnecessary downtime. Whether you’re upgrading a fleet, modifying a single tail or launching a brand-new program, our team delivers expert engineering that keeps your aircraft flying and your operation moving forward.
Turnkey Solutions Backed by STS Expertise
- Precision materials, custom kitting and expert fabrication
- Fully equipped MRO facilities for comprehensive repairs
- Skilled working parties deployed worldwide on demand
Aircraft Cabin Interiors
Aircraft Structural Modifications:
Exterior Modifications
Avionics Modifications:
FAA DAR Services
Approvals
FAA
CAA / EASA
Aircraft Cabin Interiors
Aircraft Cabin Interiors
- Expert design and optimisation of Passenger Accommodations (LOPA)
- Custom layouts for Passenger Service Units (PSU)
- Design, modification and installation of aircraft monuments
- Seat replacements and reconfigurations to meet evolving specs
- Upgrades to escape path lighting, flooring and carpet systems
- Precise layout and integration of Emergency Equipment (EEL)
- Creation and application of compliant placards and markings
- Installation and upgrade of soft furnishings across all cabin zones
- Flammability testing services to ensure safety and compliance
- Engineering support for crew accommodations and rest areas
- Fleet-wide standardisation to streamline configuration and compliance
Aircraft Structural Modifications:
Aircraft Structural Modifications:
- Precision-engineered fuselage penetrations for system integrations and upgrades
- Installation of antennas to support modern avionics and communication systems
- Reinforcement and reconfiguration of cabin floor structures for new layouts
- Engineering and compliance for monument and seat track installations
- Design and implementation of monument provisions for custom interiors
- Full de-modification services for structural and systems reversion or updates
Exterior Modifications
Aircraft Exterior Modifications
- Custom livery changes to reflect branding, partnerships, or fleet updates
- Aircraft exterior rebranding to align with evolving corporate identities
- Temporary registration markings for transitional operations and delivery flights
- Precise application of technical markings to meet regulatory and operational requirements
Avionics Modifications:
Advanced Avionics Upgrades for Safety & Connectivity
- Seamless Wi-Fi installations and In-Flight Connectivity (IFC) for enhanced passenger experience
- Advanced tracking systems, including full ADS-B Out compliance solutions
- Custom In-Flight Entertainment (IFE) system upgrades for any fleet configuration
- In-Seat Power (ISP) integration to support passenger device charging at every seat
- Communications system modifications for cockpit, cabin, and ground link optimisation
- Galley insert upgrades to support modern service equipment and layouts
FAA DAR Services
Expert FAA DAR Services
- Thorough aging aircraft inspections for continued airworthiness
- Issuance of standard, amended, and experimental (R&D) airworthiness certificates
- Special Flight Permits (SFP) for repositioning or ferry flights
Approvals
Engineering Approvals
STS Engineering Solutions provides extensive regulatory approvals to support a broad range of aircraft repair and modification programs, including but not limited to:
- Major and Minor Repairs / Alterations
- Fatigue and Damage Tolerance Evaluations
- FAA Supplemental Type Certificates (STC)
- DER Compliance Test Witness Services
- FAA Parts Manufacturer Approvals (PMA)
- RS-DER Repair Specifications
FAA
FAA Regulatory Compliance
- All engineering approvals are documented in strict alignment with Code of Federal Regulations (CFR) requirements
- CFR 1.1 defines “Major Alteration” and “Major Repair” with legal precision
- CFR 43 Appendix A outlines key examples and further details on major repairs and alterations
- CFR 43 Appendix B establishes clear documentation and recording standards
- CFR 121.379(b) mandates that all major work be completed using approved engineering data
- AC 43-210A or the customer’s internal logic chart guides classification of major vs. minor alterations or repairs
CAA / EASA
CAA / EASA Approvals
- STS Engineering Solutions is authorized under CAA Part 21 Subpart J Design Organization Approval (Approval No. UK.21J.1005)
- All repairs and modifications issued under our P21-J DOA are fully accepted on EASA-registered aircraft with no additional validation required