Overview
The emergency exit gives the passengers and crew more exits to leave the aircraft more quickly in an emergency.
There is one overwing emergency exit on the right side of the fuselage between FS532.40 and FS555.60. This is a plug-type exit which can be opened from the inner or outer side of the fuselage.
Insulation to decrease noise to a satisfactory level is supplied by blanket assemblies installed in the structure of the overwing emergency exit. A top cover insulation is also installed on the inner face of the structure of the overwing emergency exit. It is made in one piece, 1 in. (2.5 cm) thick, and has cutouts for the window, latch mechanism, and top and bottom handles.
Over-Wing Emergency Exit
The emergency exit is located over the wing on the right side of the aircraft. It lets the passengers and crew get out of the aircraft quickly in an emergency. It is a Type III escape hatch that is a removable plug-type hatch, held in place by a two pin locking mechanism and by the force of cabin pressure. It can be opened and removed from inside or outside of the aircraft, but must be installed from inside the aircraft.
The over-wing emergency exit is made from aluminum alloy skins, doublers and a machined structure. It has an acrylic window in its structure. There are two handles, one at the top and one at the bottom of the exit.
The emergency exit turns in and down on two hinges which engage with hinge fittings on the bottom of the exit. Also, the emergency exit has a drain hole at the bottom to remove liquids which can collect.
12/21/15
Overwing Emergency Exit Latch Mechanism
The latch-mechanism is installed in the top structure of the over-wing emergency exit. You can operate the latch-mechanism from the inner or outer side of the over-wing emergency exit. To hold the over-wing emergency exit in the closed position, the shoot bolts of the latch-mechanism extend into the surround-structure. When the latch-mechanism retracts, it releases the over-wing emergency exit for removal. The latch-mechanism has two shoot bolts, two link rods, two springs, a top handle, a push-plate, and a torque-bar.
The torque-bar of the latch-mechanism turns when the top handle is pulled or the push-plate is pushed. While the torque-bar turns, it pulls the two link rods down which are connected to the shoot bolts. The link rods retract the shoot bolts out from the fittings on the surround-structure. When the top handle or the push-plate is released, two springs moves the shoot bolts of the latch-mechanism to the closed position.
12/21/15
Overwing Emergency Exit Seal
The seal is bonded to a flange around the edges of the emergency exit structure. The seal stops air leaks around the emergency exit when the fuselage is pressurized. The seal is made from a silicone rubber with glass silicone fabric which is not flammable.
Operation
The over-wing emergency exit can be removed from the inner or the outer side of the aircraft.
The over-wing emergency exit opens from the inner side when the top handle is pulled. That disengages the latch-mechanism from the surround-structure. Then the exit can be pulled in and down. The top and bottom handles can be used to help remove the over-wing emergency exit.
The exit opens from the outer side when the push-plate and the top part of the exit are pushed at the same time.
The over-wing emergency exit can be installed from the inner side of the aircraft only. Two hinges of the over-wing emergency exit are put on the hinge fittings. The top handle is pulled. Then the over-wing emergency exit is pushed up and into the closed position. The latch-mechanism engages with the surround-structure when the top handle is released. The shoot bolts hold the exit in the closed position.