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01-75PAAA-2-2.4

WP 003 00 (ECS)

QuestionAnswer
What is the ECS comprised of? Air conditioning system, air distribution and exhaust system, and cabin pressure control system.
To what does the air distribution and exhaust system route conditioned air? Flight station, cabin, and avionics eqipment.
What does the cabin pressure control system control? Flight station and cabin air pressure.
How does the cabin pressure control system control the flight station and cabin air pressure? By regulating the outflow of conditioned air from the cabin.
What are the fresh air sources comprised of? Two engine driven compressors (EDCs) and the air multiplier package (AMP).
Describe an EDC. Single stage compressor with fully automatic controls.
When are the EDCs operable? Only when NO. 2 and No. 3 engines are running.
What are the primary and secondary air source for the air cycle cooling systems during ground operations? Primary: AMP only when the APU is running. Secondary: the EDCs
How many EDCs are there? 2
To what system do the No. 2 and No. 3 engine EDCs respectively supply air to? No. 2: right air cycle cooling system (flight station) No.3: left air cycle cooling system (cabin)
Where is the duct crossover located? In the APU compartment
Where is the EDC mounted? Mounted to a drive pad on the left side of the engine reduction gearbox assembly.
What is the max hp for an EDC and how many pounds of air does it deliver? 81hp; 60 lbs/min at sea level
At what rate does the APU/AMP supply air to both air cycle cooling systems? 125 lbs/min
What system supplies air at the pressure and flow rate required to start the engines? APU bleed air system
What does the AMP consist of? Turbocompressor, and a presssure regulator and shutoff valve.
What component is used to balance airflow when the APU/AMP is the air supply source? Two flow-limiting venturis
What does the air cycle cooling system require? Air be delivered to them at elevated pressure and temperature from an air source.
During ground operation, where is ambient air drawn from? The nose wheel well.
What is ambient air drawn from the nose wheel well used for? Used to be blown across the heat exchangers by electrically driven fans.
Where is the air cycle cooling system check valve located? Downstream from each fan. (closes when fan not running)
What does the air cycle cooling system check valve prevent? Ram air from leaking into the nose wheel well during flight when ram air inlets force ambient air across heat exchangers
What component is closed during ground operation to prevent fan discharge air from leaking out of the ram air inlets? Spring-loaded flapper doors in the ram air inlets.
Air discharged from the primary section of the heat exchanger is approximately what temperature at sea level? 135 Degrees F (57 C)
Approximately what percent of free moisture is removed from the conditioned air through the water separator? 70%
In what models does the water drained from the water separators discharged overboard? BUNO 161762, except 161410 and aircraft incorporating AFC 437
In what models does the water drained from the water separators used to supply a water spray cooling system? BUNO 161410, 161762 and subsequent and aircraft incorporating AFC 437
How many temperature control systems does the P-3 have? 2 (one for the flight station and one for the main cabin area)
What does each temperature control system consist of? Temperature controller, a selector-indicator, a master temperature sensor, a duct rate sensor, and 3 airflow control valves.
What does the hot air bypass valve control? The amount of hot primary compressor discharge air that will be bypassed around the air cycle cooling system.
What does the turbine bypass valve control? The amount of warm air that will be bypassed around the turbine refrigeration unit.
What does the turbine shutoff valve control? The volume of air flowing through the turbine refigeration unit for cooling.
Where is the ice limit sensor located? Mounted on a piece of duct at the upstream end of the water separator.
What indicates a partial blockage (yellow condition) of the water separator? Pressure differential exceeding 2.9 inches Hg
What indicates a heavy blockage (red condition) of the water separator? Pressure drop across the water separator bag to 4.1 inches Hg
In automatic mode, what is the temperature of full cold auto? 65F
In automatic mode, what is the temperature of full hot auto? 85F
What are the temperatures of the 3 reference marks on the selector-indicator? 70F, 70F, 80F
What components are not used in manual mode? The master temperature sensor, duct rate sensor and program amplifier inputs.
Where is the one-inch diameter duct connected to the exhaust section of the air distribution and exhaust system located? Above and behind the pilot's head.
The two major exhaust ducts join above electronic bay 12 in what aircraft? P-3A, P-3B
The two major exhaust ducts join in the G racks on what aircraft? P-3C
The cabin exhaust fan is driven by _____ and controlled with _____. 115 VAC 3-phase motor; red guarded cabin exhaust fan switch on the flight station AIR CONDITIONING control panel.
Where is the FAN OUT warning light located and what causes it to light? Next to the exhaust fan control switch; whenever the exhaust fan differential pressure switch senses a loss of flow
How is pressurization obtained and controlled? By restricting the amount of air that is exhausted overboard.
What type of valve is the cabin pressure outflow valve? Butterfly type, controlled automatically by pneumatic signals from cabin pressure controller, or manually by the crew with an electric actuator (electric actuator drives outflow valve fully open to depressurize cabin when aircraft lands)
What happens when the AUX VENT switch is set to OPEN? Both outflow valve and auxiliary ventilation valve are opened electrically.
Where is the cabin pressure controller located? On the CABIN PRESSURIZATION control panel.
The cabin pressure controller is divided into _____. An upper control chamber and a lower rate chamber (separated by a flexible diaphrgam).
In what two modes does the cabin pressure controller operate in? Isobaric control, or pressure differential control.
What is Isobaric control? The process of controlling the pressurization to a specified cabin altitude.
How is the pressure differential control system activated? In the event of improper settings relative to flight altitude, or a malfunction in the isobaric control system.
What is the pressure differential control system? Limits the maximum fuselgae pressure differential.
What does the pressure differential control valve monitor? The difference between cabin static pressure (sensed by the control chamber) and atmospheric static pressure.
What is pressure differential control? Process of controlling pressurization to a fixed air pressure differential value.
P-3A aircraft and early (lightweight) P-3B aircraft are limited to what maximum pressure differential value? 11.1 inches Hg
P-3C aircraft BUNO 160290 and subsequent, and aircraft incorporating AFC 341, are limited to what max pressure differential value? 13.3 inches Hg
Aircraft with a max differential of 11.1 will maintain cabin altitude at sea level up to an aircraft altitude of _____. 12,300 ft
Aircraft with a max differential of 13.3 will maintain cabin altitude at sea level up to an aircraft altitude of _____. 15,540 ft
If both the isobaric control and the pressure differential control system fail, what will operate? The cabin pressure safety relief valve
Where is the cabin pressure safety relief valve located? Beneath the copilots seat.
The cabin pressure safety relief valve is set to open at ____ to ____ differential pressure above aircraft max differential pressure limit. 0.6 to 1.1 inches Hg
Where is the negative pressure relief valve located? Mounted in the air pressure bulkhead.
What does the negative pressure relief valve prevent? Cabin pressure from becoming lower than ambient atmospheric pressure.
When is the negative pressure relief valve opened? When the atmospheric pressure is greater than cabin pressure, allowing air flow into cabin to equalize pressure differential.
What does AMP stand for? Air Multiplier Package
Created by: Dene14
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