INDIVIDUAL (GASPER) AIR DISTRIBUTION SYSTEM -DESCRIPTION AND OPERATION
1. General
A. The individual (gasper) air distribution system provides a supplementary source of cold air for each crewmember, each passenger, and each lavatory. Gasper air is provided to cool the individual area to a value different from that provided by the normal air distribution system. An outlet nozzle at each station allows the individual a choice anywhere between no cold air and full system capacity cold air. The outlet nozzle is adjustable to permit direction as well as quantity of cold air for each individual's comfort.
B. The gasper system consists of a gasper fan, risers, distribution ducts, and individual adjustable outlets. Cold air is received from the cooling packs through the cold air supply duct leading to the mixing chamber and is routed through the gasper fan. For passenger cabin the air passes up risers to distribution ducts located above the passenger service units. From the distribution ducts, cold air is taken to the individual outlets in the passenger service units and lavatories. Cold air for the crew is supplied by a separate duct on the left side going forward under the main cabin floor. (See figure 1.)
2. Gasper Fan
A. The gasper fan is a 115-volt ac motor-operated fan intended to increase pressure available in the gasper system under conditions of low supply pressure or high cold air demand. The high demand condition would exist when one air conditioning pack is operating. The fan may be run continuously without damage.
B. The gasper fan is contained in the right side of the gasper air duct in the air conditioning distribution bay. The fan provides cold air to the control and passenger gasper systems from the right air cycle system. (See figure 1.)
C. The gasper fan can be turned on or off by a switch located on the forward overhead panel. Circuit protection for the gasper fan is provided by a circuit breaker on P6 circuit breaker panel.
D. On Passenger/Cargo Convertible Airplanes an electrical interlock circuit (figure 2) prevents gasper fan operation when the smoke clearance switch is moved to either the mixed passenger/cargo unpressurized or the mixed passenger/cargo pressurized configuration. Returning the smoke clearance switch to its guarded NORMAL position permits gasper fan operation.
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3. Control Cabin Gasper Air Distribution
A. The control cabin gasper air distribution consists of a duct on the left side of the airplane below the floor, originating just upstream of the gasper fan in the air conditioning distribution bay, and extending to the control cabin. (See figure 1.) In the control cabin the duct branches into four risers, feeding six outlets, each crew station having two air outlets.
B. The captain's and first officer's gasper air outlets are located on the captain's and first officer's side panels just below the sliding window and at each end of the instrument panel shelf. The outlets for observers are located to the left of the airplane centerline, at the aft end of the control cabin. The outlets are adjustable for quantity of flow as well as direction of flow.
C. The gasper air ducts to the instrument panel outlets have mufflers to decrease duct noise. The mufflers are behind the forward electronic panel and are accessible by removing the electronic panel modules.
4. Passenger Cabin Gasper Air Distribution
A. The passenger cabin gasper air distribution consists of risers originating downstream from the gasper fan. The risers connect to a cold air distribution duct, installed above the passenger service units. From outlets on the lower surface of the distribution duct, cold air is taken directly by flexible connections to gasper air outlets in the passenger service units.
B. The lavatory gasper outlets are identical to the passenger and crew outlets. They are installed on the lavatory soffit panel and connected directly to the cold air distribution duct.
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