The AMS snake inspection system is a unique solution developed for the inspection of Heat Recovery Steam Generator (HRSG) headers and finned tube bundles. The system allows non-destructive inspections to be carried out without cutting open the header vessel to gain access. Instead an inspection stub or riser is utilised which can be as small as 40mm in diameter. The equipment is deployed into the header through the access diameter to locate the selected tube bore and feed through a position encoded NFA probe or steerable endoscope camera. The NFA probe is specialised for the finned tube application and provides a high-resolution scan of the entire inner tube surface. This unique solution offers Combined Cycle Gas Turbine CCGT plant operators high quality inspection data as well as reduced inspection time to maximise HRSG overall plant availability.