Rolls-Royce Trent borescope inspection: the three-shaft difference

What the three shafts mean for the inspector

A low-pressure fan and turbine, an intermediate-pressure compressor and turbine, and a high-pressure compressor and turbine. Each spool is rotated and inspected on its own; the port map and the turning procedure are Trent-specific, and so are the limits.

What is inspected

Fan blades; the IP compressor stages; the HP compressor stages; the combustor; the HP, IP and LP turbines — recorded on video, findings sized against the Trent manual, status per module.

Widebody transitions

Trent-powered widebodies change hands less often than narrowbodies but at much higher values, so transaction borescopes, records audits and shop visit oversight are high-stakes work. Manufacturer programs and guidance play a large role in the fleet's inspection intervals.