MIL-HDBK-17-3F Volume 3.Foreword Table of Contents 8.2.4.3 Durability... 2 8.2.5 Environmental compliance. 8.2.5.1 Elimination/reduction of heavy metals........................................... 13 8.2.5.2 Consideration of paint removal requirements... 3 8.2.5.3 Shelf life and storage stability of repair materials.......................... 8.2.5.4 Cleaning requirements.. x 8.2.5.5 Non-destructive inspection requirements.... 14 8.2.5.6 End of life disposal considerations.. 14 8.2.6 Reliability and maintainability...... 1 8.2.7 Interchangeability and replaceability 15 8.2.8 Accessibility 15 8.2.9 Repairability 15 8.2.9.1 General design approach 16 8.2.9.2 Repair design issues.............. 19 8.3 SUPPORT IMPLEMENTATION.................. 20 8.3.1 Part Inspection.… 20 8.3.1.1 Visual..... 21 8.3.1.2 Tap testing. 22 8.3.1.3 Ultrasonics. 22 8.3.1.4 Radiography.… 24 8.3.1.5 Shearography.… 25 8.3.1.6 Thermography 25 8.3.2 Damage assessment for composite repairs 26 8.3.2.1 General ..... 26 8.3.2.2 Mandate of the assessor.............. 27 8.3.2.3 Qualification of the assessor................ 27 8.3.2.4 Information for damage assessment. 27 8.3.2.5 Dependence on repair location.......... 28 8.3.3 Repair design criteria 29 8.3.3.1 Part stiffness.... 30 8.3.3.2 Static strength and stability 30 8.3.3.3 Durability.... 31 8.3.3.4 Damage tolerance................... 31 8.3.3.5 Related aircraft systems ............... 31 8.3.3.6 Aerodynamic smoothness 32 8.3.3.7 Weight and balance................... 32 8.3.3.8 Operating temperatures................ 32 8.3.3.9 Environment........................... 32 8.3.3.10 Surrounding structure.. 33 8.3.3.11 Temporary repair.… 33 8.3.4 Repair of composite structures....................... 34 8.3.4.1 Introduction.. 34 8.3.4.2 Damage removal and site preparation......... 34 8.3.4.3 Bolted repairS....................35 8.3.4.3.1 Repair concepts...... 3 8.3.4.3.2 Repair materials................ 37 8.3.4.3.3 Repair analysis.… 8.3.4.3.4 37 Repair procedures..... 38 8.3.4.3.5 Example of a bolted repair 39 8.3.4.4 Bonded repairs ......... 39 8.3.4.4.1 Repair concepts 39 8.3.4.4.2 Repair materials 41 8.3.4.4.3 Repair analysis...... 42 8.3.4.4.4 Repair procedures........... 43 8.3.4.4.5 Bonded repair examples ............. 46 8.3.4.5 Sandwich (honeycomb)repairs.............. 47 XiiiMIL-HDBK-17-3F Volume 3, Foreword / Table of Contents xiii 8.2.4.3 Durability.......................................................................................................... 12 8.2.5 Environmental compliance............................................................................................. 13 8.2.5.1 Elimination/reduction of heavy metals............................................................. 13 8.2.5.2 Consideration of paint removal requirements.................................................. 13 8.2.5.3 Shelf life and storage stability of repair materials............................................ 13 8.2.5.4 Cleaning requirements..................................................................................... 14 8.2.5.5 Non-destructive inspection requirements ........................................................ 14 8.2.5.6 End of life disposal considerations .................................................................. 14 8.2.6 Reliability and maintainability......................................................................................... 14 8.2.7 Interchangeability and replaceability ............................................................................. 15 8.2.8 Accessibility ................................................................................................................... 15 8.2.9 Repairability ................................................................................................................... 15 8.2.9.1 General design approach ................................................................................ 16 8.2.9.2 Repair design issues ....................................................................................... 19 8.3 SUPPORT IMPLEMENTATION ............................................................................................... 20 8.3.1 Part Inspection............................................................................................................... 20 8.3.1.1 Visual ............................................................................................................... 21 8.3.1.2 Tap testing ....................................................................................................... 22 8.3.1.3 Ultrasonics ....................................................................................................... 22 8.3.1.4 Radiography .................................................................................................... 24 8.3.1.5 Shearography .................................................................................................. 25 8.3.1.6 Thermography ................................................................................................. 25 8.3.2 Damage assessment for composite repairs .................................................................. 26 8.3.2.1 General ............................................................................................................ 26 8.3.2.2 Mandate of the assessor ................................................................................. 27 8.3.2.3 Qualification of the assessor ........................................................................... 27 8.3.2.4 Information for damage assessment ............................................................... 27 8.3.2.5 Dependence on repair location........................................................................ 28 8.3.3 Repair design criteria..................................................................................................... 29 8.3.3.1 Part stiffness .................................................................................................... 30 8.3.3.2 Static strength and stability.............................................................................. 30 8.3.3.3 Durability.......................................................................................................... 31 8.3.3.4 Damage tolerance ........................................................................................... 31 8.3.3.5 Related aircraft systems .................................................................................. 31 8.3.3.6 Aerodynamic smoothness ............................................................................... 32 8.3.3.7 Weight and balance ......................................................................................... 32 8.3.3.8 Operating temperatures................................................................................... 32 8.3.3.9 Environment..................................................................................................... 32 8.3.3.10 Surrounding structure ...................................................................................... 33 8.3.3.11 Temporary repair.............................................................................................. 33 8.3.4 Repair of composite structures...................................................................................... 34 8.3.4.1 Introduction ...................................................................................................... 34 8.3.4.2 Damage removal and site preparation ............................................................ 34 8.3.4.3 Bolted repairs................................................................................................... 35 8.3.4.3.1 Repair concepts .................................................................................... 35 8.3.4.3.2 Repair materials.................................................................................... 37 8.3.4.3.3 Repair analysis...................................................................................... 37 8.3.4.3.4 Repair procedures................................................................................. 38 8.3.4.3.5 Example of a bolted repair .................................................................... 39 8.3.4.4 Bonded repairs ................................................................................................ 39 8.3.4.4.1 Repair concepts .................................................................................... 39 8.3.4.4.2 Repair materials.................................................................................... 41 8.3.4.4.3 Repair analysis...................................................................................... 42 8.3.4.4.4 Repair procedures................................................................................. 43 8.3.4.4.5 Bonded repair examples ....................................................................... 46 8.3.4.5 Sandwich (honeycomb) repairs ....................................................................... 47