Our Borescope Check Process
When you choose Fierbois Engine Services for Witness Borescope Reviews, you can expect a diligent process that leaves nothing to chance. Our expertise covers a broad range of engines, including CFM56 borescope inspection, and our process includes:
Specialist Witness Representation
Our professionals act as your eyes on-site, offering neutral, unbiased borescope witness inspections. We ensure the process adheres to lease agreements, purchase requirements, or regulatory standards.
Comprehensive Documentation and Visual Records
We work with the certified inspectors to provide findings and inspection results that are transparent and supported with evidence.
Thorough Summary and Recommendations
Each report outlines any airworthiness or hardware concerns, supported by expert commentary. Should a lease return borescope review be required, our summary details everything necessary for a smooth transition or negotiation.
Actionable Insight and Aircraft Engine Support
Our due diligence checks and recommendations guide you on the best next steps regarding the purchase, continued operation, or repair of your asset.
This documented, step-by-step methodology means your interests are always protected, and your engines remain in optimal, compliant condition.


Tailored Independent Assessments
Fierbois Engine Services provides independent borescope inspections reviews across the UK and Ireland, bringing technical expertise to your preferred location.
When you engage us for borescope inspections, you benefit from impartial support that ensures compliance and uncovers issues that could affect engine airworthiness, value, and long-term reliability. Every inspection concludes with a documented, full summary report, clearly outlining any findings needed for due diligence or lease return requirements. We serve as partners in maintaining your fleet, guiding you with clarity and professionalism through the often-complex world of engine management and inspection.
Frequently Asked Questions
What are borescope inspections for aircraft engines?
Borescope inspections are detailed visual checks inside aircraft engines using specialised equipment to detect internal defects or wear early.
How do you witness borescope inspections with Fierbois Engine Services?
We act as your independent eyes during engine inspections, ensuring every step meets compliance and your interests are protected through expert representation. We can perform this service on-site, at the time of inspection or remotely with the videos provided by the licensed engineer.
What engine types can Fierbois Engine Services inspect?
We specialise in commercial turbine engines, including V2500-A5, CFM56 series, PW4000, Trent 700/800, and GE90 series.
Do borescope inspections include documentation and summary reports?
Yes, all inspections include thorough documentation, images or video as needed, and a clear summary report with our expert recommendations.
Why are borescope inspections important for lease returns?
Lease return borescope reviews help identify engine issues, confirm health for transition, and support compliance with lease agreements and regulations.
How are borescope inspection results assessed?
All borescope inspections are assessed against the Original Engine Manufacturer criteria.

Contact Us
Book specialist engine services here
If you require specialist aircraft engine support, technical assessments, or engine inspection services you can rely on, Fierbois Engine Services is ready to step in as your expert partner.