Borescope inspection checklist for aircraft engines

Before

• Engine model, ESN, TSN/CSN and the reason for the inspection (scheduled task, exceedance, event, transaction).
• The AMM task reference, the inspection sequence and the limits for every stage, downloaded and at hand.
• The engine made safe per the AMM and the operator's procedures, and cooled enough to put a probe inside.
• Access: cowls open, borescope port plugs identified, the tools for the port caps and the turning tool for the accessory gearbox so the core can be indexed.
• The videoscope: tip diameter for the ports, articulation checked, light source and battery, recording space, measurement tip calibrated if findings will be sized.
• A folder and file-naming convention agreed before the first frame: engine, date, stage, blade number.

During

• Follow the AMM sequence: fan, booster or low-pressure compressor, high-pressure compressor stage by stage, combustor, high-pressure turbine nozzles and blades, low-pressure turbine.
• Rotate the core a full turn at each stage so every blade is seen; count blades against the stage's blade count so none is missed.
• Record video of each stage and stills of anything noteworthy, with the port and the blade number in the name or the narration.
• Size every finding — crack length, dent depth, missing material, coating loss area — and note the limit it is judged against.
• Stop and consult when a finding is beyond limits or outside the inspector's authorization.

After

• Port plugs and seals refitted per the AMM, torqued and recorded; cowls closed.
• The engine's status recorded module by module: serviceable, repetitive inspection or reduced cycles, unserviceable.
• The report: findings with images, measurements, AMM references, the equipment used, the inspector's name and authorization, and a signature.
• The owner, operator or lessor informed, and any repetitive inspection added to the maintenance program.

Where InspectView fits

The folder lands in the app sorted by stage, the findings are drafted against the manual limit, and the report fills itself for the inspector to check, change and sign. The checklist above still applies — software does not open the cowls.