LINING AND INSULATION - DESCRIPTION AND OPERATION
1. General
A. The control cabin lining panels (Fig. 1) cover the inside walls and ceiling of the control cabin except the areas covered by instrument panels, circuit breaker panels, and the forward bulkhead.
B. The control cabin is insulated by fiberglass blankets and a drip pan (Fig. 2).
2. Control Cabin Lining
A. Formed panels, made from thermo plastic sheet material, line the control cabin walls and ceiling (Fig. 1). The panels are fastened to the airplane structure and to other panels by quick-release fasteners or by screws. Sponge rubber on formed plastic padding is cemented to the structure that surrounds the windows. The panels have openings for instrument panels, lights, fresh air outlets, loudspeakers, waste containers and other equipment.
3. Control Cabin Insulation
A. Fiberglass Blankets
(1)
Fiberglass insulation blankets cover most of the cabin sidewalls and ceiling. The blankets are made in suitable sizes and shapes to ensure fitting the wall structure and to facilitate installation and removal. They have cutouts or slits where necessary to clear equipment, support structure or brackets.
(2)
A typical blanket is made of fiberglass batts cemented with one side to the trim fabric. The other side is covered with backing fabric. All edges of the outline except the lower edge, cutouts and slits are bound with a strip of trim fabric and sewn together with one or two rows of stitches. All stitches are sealed with cement to make blankets moisture and oilproof. The lower edge is left open to allow free drainage of water from the blanket.
(3)
Insulation blankets are attached to the structure and to each other as necessary, by blanket fasteners (plastic studs and washers). Studs only are used in a few places of limited accessibility. A few blankets are spot cemented to the structure along one or more edges.
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Control Cabin Lining 500
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B. Drip Pan
(1)
The drip pan is installed above the overhead instrument panel. It provides insulation for this area and collects and drains area condensate. (See figure 2.)
(2)
The drip pan is a moulded plastic pan. Pan flanges and ribs are covered with strips of sponge type plastic, cemented to the pan. All other pan surfaces are covered with pads of fiberglass batting, enclosed between two sheets of neoprene coated nylon fabric. The pads are attached to the pan by cementing the pad borders to the sponge plastic strips.
(3)
The condensate occurring between the pan and structure is collected on the structure side of the pan. The condensate drains through a tube routed below the lower nose compartment floor, and overboard through the airplane body drain system. See Chapter 51, Airframe Drainage.
(4)
The drip pan is bolted to the structure and supports the overhead panels.
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Control Cabin Drip Pan 500
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CONTROL CABIN LINING - REMOVAL/INSTALLATION
1. Remove Control Cabin Lining Panels (See figure 401.)
A. Remove equipment where necessary to clear.
B. Remove or loosen adjacent fittings and panels where necessary to free panel.
C. Unscrew and maneuver the panel in suitable directions until completely free.
2. Install Control Cabin Lining Panels (See figure 401.)
A. Place the panel in position and secure it with mounting screws.
B. Tighten loose fittings or adjacent panels.
C. Install fittings and equipment.
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