Nozzle Guide Vane Inspection:
Inspection of the NGVs is possible using a strong light source and mirror, it is more probable however that a boroscope inspection will be required. The NGVs are examined for signs of damage and or bowing on their trailing edges. Bowing may be an indication of a faulty fuel nozzle. Again the engine manufacturer will detail the damage/bowing tolerances which, if exceeded will result in module or engine replacement.
Inspection of the exhaust section of the engine can be done visually using an appropriate light source. The exhaust cone and jet pipe are examined for signs of cracking, weeping, buckling or hot spots. Hot spots identified on the exhaust cone may be the result of a defective fuel nozzle or combustion chamber resulting in the requirement for further investigation.