ATC Lasham Borescope Inspection

Aircraft inspection of CFM56-3 engines on Boeing B737-400
Case Study

RVI Ltd was contracted by ATC Lasham Ltd to perform a routine “hot section” borescope inspection of both CFM56-3 engines on a Boeing B737-400 aircraft operated by Aero Contractors.

It was supposed to be a routine inspection!

The “hot section” borescope inspections consisted of the inspection of the combustion chamber liners, the fuel burners and the nozzle guide vanes in one module then the borescope inspection of the high pressure turbine blades in another module.

We had been informed that there were no known issues with either engine with regards to vibration, EGT or fuel flow so expected to find only minimal wear and tear when we found the defect the engineering rep the preparation engineers and us were very surprised the engine was able to run with no adverse indications.

Engine borescope inspection case study

Half of an HP Turbine Blade missing

This engine could not remain in service as the damage is way beyond the allowable Aircraft Maintenance Manual limits.

The engine was removed and sent away for repair which meant the operator had to lease an engine for several weeks while their engine was being repaired.

The other engine inspection went very well with only the usual minor defects being found and RVI Ltd was able to issue an EASA form 1 allowing this engine to continue in service.

This model of engine “The CFM56-3” has been in operation since 1984 and with findings like this being very rare and the fact that this engine had been operating normally prior to the inspection is a testament to the strength and durability of the CFM56 engines and in particular the -3 series of engines.

Remote Visual Inspections Ltd
EASA Approval UK.145.01009
FAA Approval RQ6Y406C

Contact us today at or just fill out the form on the right if you would like us to perform a borescope inspection for you.