![]() undergoes a chemical transformation and creates an insoluble substance.Įxplanation. undergoes a chemical transformation and creates an insoluble substance. warm soapy water, rinsed and dried.Įxplanation. Aircraft transparent plastics are cleaned using. Which product is a serious health hazard when handling?. is crude, but works remarkably well.Įxplanation. Tap testing a sandwich panel construction. What is the separation of an aramid panel layers described as?. Air is removed by vacuum whether an autoclave is used or not. have no effect on its direction.Įxplanation. life can be extended by 12 months if stored above 40 ☌.Įxplanation. no life extension is allowed, it must be used immediately. life can be extended by 12 months if stored above 40 ☌. ![]() life can be extended by 12 months if stored below 10 ☌. The maximum length of time a component is held in stores is known as the. may be tolerable if lightly loaded.Įxplanation. could be reinforce with additional plies over the weakened area. Slight waviness on a fibre composite structure. When the heating is paused it is called 'hold' or 'soak' at the 'arrest point'. Ramp-up' and 'ramp-down' refer to the heating and cooling rates (in ☌ per minute). When the temperature increases on a hot bond repair is paused it is known as. Too much hardener will greatly reduce pot life as well as make the polyester brittle. Use of excessive hardener in polyester resin leads to. Bubbles (large ones anyway) are removed with a roller. Bubbles are removed from a wet composite lay-up by. When laying up a glass fibre repair, the extra layer of fibre is. Airbus A340 SRM - states Carbide or Carbide tipped drill for composite materials. When drilling a carbon fibre reinforced plastic use. Most correct answer for a repair to a honeycomb sandwhich structure. Glass cloth or thin aluminium sheet.Įxplanation. What is used as the base covering on a honeycomb repair?. A colder temperature will cause a resin to take longer to cure. The effect of a lower temperature than ambient during the curing period of a resin, will cause the curing time to. The heat can be applied externally (endothermic) or created internally by a catalyst or hardener (exothermic). plastics (or adhesives) require heat to make them cure. Thermosetting adhesive, during their curing cycle give off. decreases with an increase in temperature.Įxplanation. decreases with an increase in temperature. is not reliant upon temperature fluctuations. Honeycomb for repair can be removed with. accelerator and catalyst before resin.Įxplanation. When mixing resin it is dangerous to add. In an autoclave what would you cover the repair in?. An autoclave uses pressure, so the alarm must sound if the pressure drops below normal. Lower than operating pressure.Įxplanation. In an autoclave what pressure would the vacuum alarm be set at?. Maximum repair with microballoons is approximately 3/8 inch - closest here is 10 mm. Maximum repair dimensions for use of microballoons is.Įxplanation. See Jeppesen Advanced Composites (dwell time = soak time = arrest point). See Jeppesen Advanced Composites shows a diagram with it opposite side (fig 7-4) and one showing it combined with the vacuum nozzle (fig 7-6). Although the vacuum gauge can be placed anywhere, the easiest being on the same side as the vacuum nozzle, the most logical answer (and probably the one the CAA want) is opposite side of the repair to the nozzle. During vacuum bag lay-up the vacuum gauge is placed where?. Corona method is used to prepare a thermoplastic material. ![]() A thermoplastic fibre reinforced composite is prepared by. Heater mats should overlap the repair by. When using a backing former on a composite repair you need to use. Microballoons is the lightest filler material. It is the lightest filler material.Įxplanation. Why would you use microballoons as a filler?. Remove all resin and start again.Įxplanation. Add hardener at the edges and it will cure. What do you do if you forget to add hardener to a composite repair?. The breather mat allows the air to flow from the repair. The vacuum connections on a fibreglass repair must be placed onto the. To indicate temperature when a repaired composite item is cured with heat lamps.Įxplanation. As a temporary repair in a glass fibre internal. To indicate temperature when a repaired composite item is cured with heat lamps. For the boundary marking of a composite repair.
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