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Engine Borescope Practices60th Annual A4A Nondestructive Testing ForumSeptember 18-21, 2017 - Fort Lauderdale, FL USAPresented By: Don Duncan
The role of engine borescope inspections20 years ago . Aircraft owned, spareengines available, fleetutilization less optimized. More in-house maintenance- little use of HMP’s andMRO’s. Basic borescope equipment,experienced workforce, lessfleet/engine types.Today . Creative leasing programs,power-by-the-hour, fleetsmatched to route demands,more ETOPS. Cost-effective maintenanceprograms, minimized downtime, compete for work. Video borescopes, moreservice-limit informationand demand for preciseinformation.2
Does your operation currently perform any type ofengine borescope inspections?a. Yes - 16 Airline - 9 MRO - 5 Cargo - 2b. No - 0c. Yes, but by an outsidevendor - 0d. Other - 0CFM56 LPT Vane SegmentOlder Borescope Resolution3
Approximately how many personnel do you employthat perform borescope inspections?a. 1-25 - 7 Airline - 2 MRO - 5b. 26-75 - 1 Cargo - 1c. 76-150 - 3 Airline - 2 Cargo - 1d. Over 150 - 5RB211 LPT Vane Segment Airline - 54
Who performs your engine borescope inspections?a. In-house designatedpersonnel - 9 Airline - 4 Cargo - 1 MRO - 4b. Outside contractor orvendor - 0c. Both of the above - 7 Airline - 5 Cargo - 1 MRO - 1PW4168 HPT NGVd. Other - 05
What types of engine borescope inspections areperformed at or for your operation?a. Periodic (time/cyclecontrolled) conditionmonitoring - 16 1 MRO - periodic onlyb. FOD, birdstrike - 15c. Reported overtemp - 15d. Evaluation for lease return,receiving acceptance - 15CFM56 Turbine Shroud6
In what type of maintenance environment does youroperation conduct borescope inspections?a. Line maintenance - 11 Airline - 8 Cargo - 2 MRO - 1b. Aircraft base/overhaulmaintenance - 13c. Airline - 8 Cargo - 2 MRO - 3Repair/overhaul shop - 10 Airline - 5 Cargo - 2 MRO - 3RR Trent 772d. Other7
Does your operation have a company written practiceor standard procedure for performing borescopeinspections?a. Yes - 14 Airline - 8 Cargo - 2 MRO - 4b. No - 2 Airline - 1 MRO - 1CFM56 Compressor Blade8
Does your written practice or standard procedurerequire any training or qualification for those personnelperforming borescope inspections?a. Documented trainingonly - 2 MRO - 2b. Documented trainingand qualification - 13 Airline - 8 Cargo - 2 MRO - 3c. No - 1 Airline - 1RB211 6th Stage TE & ShroudStereo Tip - No Measurementd. Other9
Which of the following borescope inspection trainingbest describes your operation?a.b.c.d.Factory/OEM or in-house trainingonly - 3 Airline - 2 Cargo - 1Combination of initial classroom,practical, OJT training - 7 Airline - 4 MRO - 3OJT training only - 2 Airline - 1 MRO - 1Other - Both a. & b. - 4 Airline - 2 Cargo - 1 MRO - 1CFM56 CombustorStereo Measurement10
Does your borescope inspection training programrequire some type of recurrent training/qualification?a. If yes, how often: 1 Year – 1 (Airline) 2 Years – 3 (2 Airlines, 1 MRO) 3 Years – 3 (1 Airline, 2 Cargo)b. No - 8 Airline – 4 MRO – 4c. Not applicable - 1CFM56 Combustor Airline - 1d. Other11
Who is qualified to perform borescope inspectionswithin your operation?a.b.c.d.Mechanics - 0Inspectors - 5Designated personnel - 4Other - 7 NDT personnel - 1 Mechanics & Inspectors - 1 Inspectors & Designatedpersonnel - 5CFM56 Compressor Blade LE12
What type(s) of borescope inspection equipment isused within your operation?a. Rigid fiber-optics withseparate light source - 6b. Flexible fiber-optics with aseparate light source - 5c. Video borescope withoutmeasuring capabilities - 8d. Video borescope withmeasuring capabilities - 15CFM56 CombustorStereo Measurement13
For borescope inspections with results beyond limitsrequiring engine removal; does your operation have aprocedure for reviewing/confirming results?a. No – The person whoperformed the borescopemakes the finaldetermination - 2b. Yes – results arereviewed/confirmed by asupervisor or manager - 3c. Yes – results arereviewed/confirmed byengineering - 14d. Yes – results arereviewed/confirmed by adesignated committee - 0CFM56 Oil WettingCabin Odor14
The role of engine borescope inspectionsWhy borescope? Gain information at normalintervals for conditionmonitoring. Provide information to helpdetermine serviceabilityafter abnormal operations. Establish repair work scope,maintenance programadjustments, operationpractices.What are the expectations? Inspectors must know theengine components, correctaccess, maintenancedocuments. Inspectors must practiceproper borescopeequipment care, handlingand usage. Inspectors must be able toaccurately document andcommunicate results.15
Thank You!Questions?16
The role of engine borescope inspections. Why borescope? Gain information at normal intervals for condition monitoring. Provide information to help determine serviceability after abnormal operations. Establish repair work scope, maintenance program adjustments, operation practices. What are the expectations? Inspectors must know the
