DOC AIRBUS | AMM A320FPOWER PLANT DRAINS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
Drain and Vent SchematicA. Drain and Vent System
The drain and vent system consists of tubes. These tubes collect waste fluids and vapor from the nacelle, the engine and its accessories and carry them overboard. Drains are provided from any point where lines and accessories may leak and where fluids may accumulate in a cavity. Some drain lines serve as vents: they carry air and vapor from the engine and accessory cavity.
The drain and vent system is divided into three sections:
The drain and vent system consists of tubes. These tubes collect waste fluids and vapor from the nacelle, the engine and its accessories and carry them overboard. Drains are provided from any point where lines and accessories may leak and where fluids may accumulate in a cavity. Some drain lines serve as vents: they carry air and vapor from the engine and accessory cavity.
The drain and vent system is divided into three sections:
- The collector which collects and retains drained fluids,
- the module assembly which discharges fluids,
- the drain mast through which the fluids are discharged overboard.
B. Collector
The collector assembly is composed of 4 drain valves and 2 holding tanks. The collector retains fluids until expelled during flight. The collector assembly is attached to the aft side of the engine gearbox.
The collector assembly is composed of 4 drain valves and 2 holding tanks. The collector retains fluids until expelled during flight. The collector assembly is attached to the aft side of the engine gearbox.
C. Module Assembly
Various drain tubes are attached to the module assembly including a drain tube from the collector. The module assembly also supports the drain mast. The module is attached directly to the aft side of the engine gearbox.
Various drain tubes are attached to the module assembly including a drain tube from the collector. The module assembly also supports the drain mast. The module is attached directly to the aft side of the engine gearbox.
D. Drain Mast
The drain mast is attached to the drain module assembly and protrudes through the fan cowl door into the airstream. The drain mast contains three cavities. The smaller forward cavity feeds ram air to the module assembly. The other two cavities are for drainage. The drain mast is located in the fan compartment (lower section).
The drain mast is attached to the drain module assembly and protrudes through the fan cowl door into the airstream. The drain mast contains three cavities. The smaller forward cavity feeds ram air to the module assembly. The other two cavities are for drainage. The drain mast is located in the fan compartment (lower section).
2. System Operation
The collector retains drained fluids until expelled in flight. The module assembly discharges fluids directly overboard through the drain mast. The drain mast which protrudes through the fan cowl door into the airstream is the channel through which the fluids are discharged overboard except for the fuel shroud drain which discharges fluid directly overboard through an independent drain tube.
Each accessory seal (starter, IDG, hydraulic pump, fuel pump) has a separate drain to the collector in which leakage is contained. Manual drain valves in the bottom of each collector are used to drain each collector on the ground. Each collector is labeled with the accessory seal drain to which it is connected. These individual collectors overflow into the fuel/oil holding tank or a hydraulic fluid/oil holding tank.
Leakage is contained in the holding tank until the aircraft reaches an airspeed of 200 Knots. When the airspeed reaches 200 Knots a pressure valve in the module assembly admits ram air. The ram air pressurizes the holding tanks and any accumulated fluid is discharged overboard through the drain mast.
Fluids from the following sources drain into the module assembly and are discharged directly overboard, except for the fuel shroud pipe which has its own drain tube:
The collector retains drained fluids until expelled in flight. The module assembly discharges fluids directly overboard through the drain mast. The drain mast which protrudes through the fan cowl door into the airstream is the channel through which the fluids are discharged overboard except for the fuel shroud drain which discharges fluid directly overboard through an independent drain tube.
Each accessory seal (starter, IDG, hydraulic pump, fuel pump) has a separate drain to the collector in which leakage is contained. Manual drain valves in the bottom of each collector are used to drain each collector on the ground. Each collector is labeled with the accessory seal drain to which it is connected. These individual collectors overflow into the fuel/oil holding tank or a hydraulic fluid/oil holding tank.
Leakage is contained in the holding tank until the aircraft reaches an airspeed of 200 Knots. When the airspeed reaches 200 Knots a pressure valve in the module assembly admits ram air. The ram air pressurizes the holding tanks and any accumulated fluid is discharged overboard through the drain mast.
Fluids from the following sources drain into the module assembly and are discharged directly overboard, except for the fuel shroud pipe which has its own drain tube:
- the oil tank scupper,
- the forward sump,
- the fan case,
- the oil/fuel heat exchanger,
- the VBV,
- the VSV,
- the TCC,
- HMU (POST SB RA32071-14),
- the aft sump,
- the fuel shroud pipe (individual drain tube).