Aircraft Technical

  What we call encircled metal stripe object on below Picture?                                                                     Fig 01 Rain Gutter Well, It is called  rain gutter.The Purpose of rain gutter is to prevent drip of rain water, condensation water , de-icing fluid on passengers or crew during embarkation or de-embarkation .It also keeps water out of the plane interior,where floors can become slippery.                                                               Fig 02 Rain Gutters Installed Position Rain Gutter installed on passenger aircraft are usually fixed above cabin door on fuselage section.The size of rain gutters is limited due to aerodynamic drag.Thus, in heavy rain condition rain gutter may fill and overflow over the door area.To Allow rapid drain of water, Rain gutters usually installed in inclined position.Aircraft forward door rain gutters inclined downward in forward direction so that all water drain toward nose of the aircraft.Aircraft aft door rain gutte

  Insulation blanket is heat and acoustic barrier.It is made of fiberglass wool.Fiberglass wool filled between waterproof polyurethane covers and edges are sealed to prevent water ingress.                                    Fig 1 Insulation Blanket on Fuselage Structure Aircraft necessarily create a lot of unwanted noise. The main source of noise in aircraft are engines and air flow, which transits through the fuselage and overall structure. In order to make aircraft interior quieter, an insulation blanket used. When aircraft at high altitude, the outside temperature is about -60-degree Fahrenheit. In combination with pressurization, aircraft insulation material helps keep the cabin warm by filling the space between the interior wall and the aircraft fuselage.   As we know that fire retardant material is must for all aircraft. The reason of choosing fire retardant material is to minimize the potential for a fire and help to prevent or slow flame spreads if a fire occur, which will pro

Why Wing Tip Brake of Flap and Slat Installed at outboard of wing? The function of wing tip brake to hold and stop rotation of flap/slat transmission shaft when slat/flap control computer sense asymmetry, uncommanded or runways condition of flap/slat. Wing tip brake(WTB) work similar to pressure  off brake(POB).Pressure off brake installed in power control unit (PCU) and wing tip brake separately placed at wing tip. The contraction of WTB and POB similar to brake of an aircraft. As the brake has stator, rotor and piston housing similarly we have stator, rotor and piston housing  in WTB and POB . Pressure Off Brake                                                               Fig 1  Pressure  Off Brake POB consist of friction disc, spring and piston assembly for actuation of spring. When hydraulic pressure available spring compressed. Spring pressure removed from friction disc and transmission shaft turns freely. In absence of hydraulic pressure spring pressure acting on friction disc w