Layup materials............................................................7-19 Layup process (typical laminated wet layup) ..............7-28 Layups..........................................................................7-26 Layup tapes ..................................................................7-21 Layup techniques .........................................................7-28 Leg ...............................................................................4-59 Lift..................................................................................2-7 Lightening holes...........................................................4-82 Lighting and adjusting the torch ..................................5-13 Lightning protection fibers ............................................7-6 Lilienthal, otto................................................................1-2 Linseed oil......................................................................8-3 Location and placement of marks ................................8-17 Lockbolt fastening systems..........................................4-52 Inspection .................................................................4-53 Removal ...................................................................4-53 Longeron repair..........................................................4-104 Longitudinal stability .....................................................2-9 Machining processes and equipment ...........................7-49 Magnesium welding.....................................................5-19 Main rotor system ........................................................1-43 Rigid .........................................................................1-44 Semirigid ..................................................................1-44 Main rotor transmission ...............................................2-35 Maintaining original contour .......................................4-89 Maintaining original strength.......................................4-87 Maintenance.................................................................1-38 Maintenance manual ....................................................2-40 Major components of a laminate....................................7-2 Making straight line bends...........................................4-60 Male and female die forming.......................................7-55 Manual foot-operated sheet metal shrinker..................4-27 Manufacturer’s inspection program.............................2-62 Manufacturer’s service information.............................2-40 Manufacturing and in-service damage.........................7-13 Marking method...........................................................2-33 Marking tools .................................................................4-4 Masking and applying the trim ....................................8-16 Masking for the trim ....................................................8-16 Masking materials........................................................8-16 Materials ........................................................................6-7 Matrix imperfections....................................................7-13 Matrix materials .............................................................7-6 Maule punch tester.......................................................3-11 Mechanical control.......................................................2-14 Mechanical-lock blind rivets........................................4-48 Medium frequency vibration........................................2-31 Metal decals with cellophane backing .........................8-18 Metal decals with no adhesive .....................................8-18 M N O Metal decals with paper backing..................................8-18 Methylene chloride ........................................................8-2 Methyl Ethyl Ketone (MEK) .........................................8-2 Microshavers................................................................4-39 Mineral spirits ................................................................8-3 Minor core damage (filler and potting repairs)............7-34 Mixing equipment........................................................8-10 Mixing resins ...............................................................7-30 Moisture detector .........................................................7-19 Monocoque ....................................................................1-9 Monospar .....................................................................1-12 Motion............................................................................2-3 Motors ..........................................................................9-98 Multiple pass welding ..................................................5-26 Multispar ............................................................ 1-12, 1-13 NACA method of double flush riveting.......................4-46 Nacelles........................................................................1-19 Nacelle station..............................................................1-39 Naphtha ..........................................................................8-3 National Advisory Committee for Aeronautics  (NACA)........................................................................4-46 Negligible damage .......................................................4-91 Neutral axis ..................................................................4-59 Neutral flame ...............................................................5-13 Neutron radiography ....................................................7-19 Newton’s laws of motion ...............................................2-3 Nibblers..........................................................................4-9 Nick..............................................................................4-91 Nicopress® process......................................................2-41 No bleedout..................................................................7-29 Nondestructive inspection (NDI) of composites..........7-15 Nonwoven (knitted or stitched) .....................................7-4 NOTAR........................................................................1-46 Notcher.........................................................................4-12 Numbering systems......................................................1-39 I-7 Offset flapping hinge ...................................................2-31 Ohm’s Law.....................................................................9-2 Open and closed bends.................................................4-73 Open and closed skin area repair .................................4-97 Open angle ...................................................................4-60 Open assembly time.....................................................6-11 Open end bend (less than 90°) .....................................4-74 Open wiring .................................................................9-78 Opposition to current flow of AC ................................9-12 Apparent power ........................................................9-20 Inductive reactance...................................................9-12 Parallel AC circuits ..................................................9-18