Anti-slip paint is the overwing escape zones. Thepaint system used includes polyurethane primers and paint on theexternal surfaces, and epoxy primers and polyurethane paint on theinternal surfaces. PAINT SYSTEMBefore the final paint system, all aluminum parts are primed. STRUCTURE GENERAL (3)STRUCTURE PROTECTION (continued) STRUCTURE PROTECTION - AIRCRAFT DRAINAGE & SURFACE PRETREATMENT Titaniumfasteners are either sulphuric acid anodized or aluminum coated.Composite materials are left bare. The other titanium alloy surfaces are left bare. The main pretreatment used is the unsealed chromic acidanodizing.Titanium alloys: surface interfaying with aluminum alloy parts arezinc sprayed. SURFACE PRETREATMENTThe protection of the structure against corrosion is achieved by meansof appropriate surface pretreatment of the metallic parts.Aluminum alloys: the primary protection is generally a pure aluminumcladding. Remotedrains are used when natural drainage is not possible. Holes and gaps aremeant to be used for a natural drainage of the fluid collection points.Drain holes are drilled before application of pretreatments. STRUCTURE GENERAL (3)STRUCTURE PROTECTIONĪIRCRAFT DRAINAGEWings and fuselage have different types of drains. METALLIC MATERIALSThe basic A/C structure is made of aluminum alloys with stainlesssteel and titanium alloys in specific areas.ĬOMPOSITE MATERIALSComposite materials are used for primary and secondary structure.Composite materials represent about 15% of the A/C structural weight.Carbon Fiber Reinforced Plastic (CFRP) is mainly used for primarystructures, whilst Aramid Fiber Reinforced Plastic (AFRP) and GlassFiber Reinforced Plastic (GFRP) are only used for secondarystructures.ĪIRCRAFT MATERIALS - METALLIC MATERIALS & COMPOSITE MATERIALS MAINTENANCE COURSE - T1 (CFM56-5B/ME)51 - STRUCTURE
582Structure Protections & Awareness D/O (3). 518A318 Damage Assessment Example 3 D/O (3).
208Structure Damage Identification D/O (3). JOHN QUINLISKTraining and Quality Delivery Manager I trust your stay with us will be informativeand enjoyable. They will be useful to you during yourtraining, but I must emphasise that theappropriate Approved Technical Publicationsmust always be used when you are actuallyworking on the aircraft. The information presented is as correct aspossible at the time of printing and is notsubject to amendment action. Your Course NotesThese notes have been prepared by BritishAirways Engineering Training to provide asource of reference during your period oftraining. ETBN 0406 A318/19/20/21 ISSUE 1 MARCH 2008īritish Airways Engineering Training Centreī r i t i s h A i r w a y s E n g i n e e r i n g T r a i n i n g