FAA Aviation Mechanic Powerplant (AMP)Engine InspectionMedium
A technician performs a borescope inspection of a turbine engine's hot section and finds several turbine blades with minor leading-edge nicks and slight discoloration but no cracks or missing material. According to typical engine manufacturer criteria, what is the appropriate course of action?
- ANo documentation is required since the damage is minor
- BThe findings are documented and compared to serviceable limits; minor damage within limits allows continued service
- CThe engine must be removed and sent for overhaul immediately
- DThe turbine section must be completely disassembled for further inspection regardless of damage severity
Show answer & explanationAnswer & explanation
Correct answer: B. The findings are documented and compared to serviceable limits; minor damage within limits allows continued service
Borescope inspection findings are compared against the manufacturer's serviceable limits chart. Minor nicks and discoloration that fall within allowable limits do not require engine removal; they are documented, and the engine may continue in service with follow-up monitoring.
Why the other options are wrong
- A. Documentation is always required regardless of damage severity.
- C. Immediate removal is not required if damage is within serviceable limits.
- D. Full disassembly is not warranted for damage within allowable borescope limits.
Turbine Hot Section Borescope Inspection
A visual inspection method using a fiber-optic scope to examine combustor and turbine components without engine disassembly.
- Compares findings to manufacturer serviceable limits charts
- Allows detection of cracks, erosion, and blade damage without teardown
- Reduces maintenance costs by avoiding unnecessary engine removal
Memory trick: 'Peek before you pull the engine'