LIST OF EFFECTIVE PAGESFeb 1/98
PIPER AIRCRAFT PA-42-720(AdvancedTrainer) MAINTENANCE
MANUAL
CHAPTER51-STANDARDPRACTICES
AND STRUCTURES -GENERAL
TABLEOF CONTENTS
SUBJECT CHAPTER PAGE
51-00-00
Standard Practices and Structures -General 1 General 1 StructuralRepairs 1
51-10-00
Smoothness PassengerWindowSkin Inspection 1 Wing and Associated Structure 3 EmpennageandAssociatedStructure 4 CracksIn Bend Radius of Flanges (Non-Pressurized 5
Investigation,Cleanupand Aerodynamic 1
Areas) Cracks in Flange 5 Cracks in Lightening Hole Flanges 7 Repair of Cracked orTom-Out Dimpled Holes Around Generator Cooling Scoop 8 Fuselage Repairs -PressurizedSection 10 InspectionItem, Part, Description, Referenceand Action 11
51-20-00
Processes 1 SealingProcedures 1 Sealing of Nacelle Fuel Tank 1 SurfacePreparation 1 Material Preparation 1 List of Materials 1 SealantApplication 2 FuselageSealing 5 Surface Preparation 5 MaterialPreparation 5 Listof Equipment 6 List of Materials 6 Sealant Application 6 Sealing Faying Surfaces 7 Sealing Joggles 7 Sealing Holes and Voids 7 Holesand Voids in (Cold) Air Duct Work 7 SealingSeams and Joints 10 SealingFasteners 10 Sealing "AN" Standard BulkheadFittings 10 Sealing Electrical Harnesseswith Sealing Compound 11 SealingElectricalHarnesseswith Heat ShrinkableCoverings 11 Applicationof Release Agent 14 Sealing Formed-In-Place 14
Gaskets Removalof Sealant 14 EquipmentCleanUp 14
EFFECTIVITY:
040-999
CONTENTSPAGE 1
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
CHAPTER51 -STANDARDPRACTICES AND STRUCTURES -GENERAL
TABLEOFCONTENTS(continued)
SUBJECT CHAPTER PAGE
51-20-00(continued)AvionicsandECUBayDoorSealing 15 AvionicsandECUBayDoorSealsRemoval 15 AvionicsandECUBay Door SealsInstallation 15 AvionicsandECUBay Door CamlocFastenersSealing 15
51-40-00 Fasteners 1 Rivet Replacement 1 OversizeRivetReplacement 2 RivetSubstitution
3
BlindRivets
3 HollowRivets 3 High-ShearFasteners 3
51-70-00 Repairs 1 SheetMetalRepairs 1 FuselageRepairs-PressurizedSection 1
EFFECTIVITY: 040-999
PAGE2
Jan 10/90
CONTENTS
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
Standard Practices and Structures -General
A. General
structure. The fuselage contains bulkheads,stringers,and stiffeners which are attached to the outer skin. The cabin entrance and cargo doors are located on the left side of the aircraft. An emergency exit is installed in the third window back, on the right side of the aircraft. The wings and empennage arealso made of full cantilever,semi-monocoque ThePA-42-720series aircraft containsa metal, semi-monocoque
construction.
B. StructuralRepairs
to recommended in this chapter and regulationsset forth in FAA Advisory Circular 43.13-1A. To assist in repairs and replacements, Structuralrepairs must be made according repairprocedures
Figure 1 identifies the type and thickness of various skin material used. Never replace skin or patch plate with materialother than of the original type skin. The repair must be as strong asthe original skin, and flexibility must be retained so surrounding areas will not receive extra stress.
When making major structural repairs other than replacing factory manufactured parts, the manufacturermust be contacted.
WARNING: NO ACCESS HOLES ARE PERMITTED IN ANY CONTROL SURFACES. DO NOT USE PATCHPLATES OR ANY FILLER MATERIAL NORMALLYUSED FOR REPAIR OF MINORDENTS, ON ANY MOVABLE TAIL SURFACES.
NOTE: When service is completed on the elevator control system, conducta friction check to ensure system friction is within limits.
If access holes need to be cut for skin repairs on the aircraft, refer to Figure 2 for typical access hole specifications.In pressurized areas, all skins, formers, stringers, etc, are considered structural membersand must be treated as such. All repair material must be free of defects such as nicks, scratches, etc, which can cause stress risers. Do not dimple a structural member by driving the rivet head into the part.
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