DOC AIRBUS | AMM A320FENGINE DRAINS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. System Description
A. General
The drain system is a set of drain tubes that permit unwanted fluid to safely drain away from the engine. The drain system is divided into three zones known as the fan zone, the core zone and the turbine zone.
The drain system is a set of drain tubes that permit unwanted fluid to safely drain away from the engine. The drain system is divided into three zones known as the fan zone, the core zone and the turbine zone.
B. Fan and Core Zone
(1) General description
Each zone has a part known as a drain mast at the lowest point. The lowest part of each drain mast extends overboard into the airflow below the outer surface of the engine nacelle. A set of drain tubes connect the engine components where leakage could occur to the applicable drain mast.
Unwanted fluids drain overboard by gravity through holes at the bottom of each drain mast.
You can examine the holes at the bottom of each drain mast to find if leakage has occurred. Refer to AMM TASK 71-00-00-790-806-A - DRAIN MAST LEAKAGE IDENTIFICATION for more information on which component is the cause of leakage.
The fan drain mast has five holes, and each hole is connected to a component as follows:
Fan zone - left hand side
Core Zone - left hand side
Each zone has a part known as a drain mast at the lowest point. The lowest part of each drain mast extends overboard into the airflow below the outer surface of the engine nacelle. A set of drain tubes connect the engine components where leakage could occur to the applicable drain mast.
Unwanted fluids drain overboard by gravity through holes at the bottom of each drain mast.
You can examine the holes at the bottom of each drain mast to find if leakage has occurred. Refer to AMM TASK 71-00-00-790-806-A - DRAIN MAST LEAKAGE IDENTIFICATION for more information on which component is the cause of leakage.
The fan drain mast has five holes, and each hole is connected to a component as follows:
Fan zone - left hand side
Fan Zone - Drain System- Engine Driven Pump (EDP) - oil and/or hydraulic fluid
- Fuel pump - Oil and/or fuel.
- Hand crank - oil
- Integrated Drive Generator (IDG) - oil.
- Oil tank - oil.
Core Zone - left hand side
- A-sump - oil
- High Pressure Turbine Active Clearance Control (HPTACC) valve - fuel
- Low Pressure Turbine Active Clearance Control (LPTACC) valve - fuel
- Modulated turbine cooling valve actuator - fuel
- Pylon drain tube/hose - fuel
- Variable Bleed Valve (VBV) actuator - fuel
- Variable Stator Vane (VSV) actuator - fuel.
- B-sump - oil
- Booster anti-ice valve - fuel
- Modulated turbine cooling valve actuator - fuel
- Pylon drain tube/hose - fuel
- Start bleed valve - fuel
- Transient Bleed Valve (TBV) - fuel
- Variable Bleed Valve (VBV) actuator - fuel
- Variable Stator Vane (VSV) actuator - fuel.
(2) Right Hand Side Fan Compartment Drain Interface
The oil tank is installed on the right hand side of the fan case. The oil tank has an overfill port to drain oil overboard if the oil level becomes too high.
The oil tank is installed on the right hand side of the fan case. The oil tank has an overfill port to drain oil overboard if the oil level becomes too high.
(3) Left Hand Side Fan Compartment Drain Interfaces
The accessory gearbox (AGB) has drain tubes connected to four of the mounting pads: the Engine Driven Pump (EDP), fuel pump, hand crank, and the Integrated Drive Generator (IDG). The EDP, hand crank, and IDG drain oil, and the fuel pump drains fuel.
The accessory gearbox (AGB) has drain tubes connected to four of the mounting pads: the Engine Driven Pump (EDP), fuel pump, hand crank, and the Integrated Drive Generator (IDG). The EDP, hand crank, and IDG drain oil, and the fuel pump drains fuel.
(4) Fan Compartment Drain Tubes and Mast
Five short tubes are brazed to the fan drain mast. This permits quick replacement of the fan drain mast. It is not necessary to disconnect drain tubes to find the cause of leakage.
Five short tubes are brazed to the fan drain mast. This permits quick replacement of the fan drain mast. It is not necessary to disconnect drain tubes to find the cause of leakage.
(5) Right Hand Side Core Compartment Interfaces
The SBV booster anti-ice, TBV, modulated turbine cooling, VSV, VBV, and pylon drain tube/hose right hand side core drain components drain fuel. The B-Sump tube drains oil through the right hand side core drain tubes.
The SBV booster anti-ice, TBV, modulated turbine cooling, VSV, VBV, and pylon drain tube/hose right hand side core drain components drain fuel. The B-Sump tube drains oil through the right hand side core drain tubes.
(6) Left Hand Side Core Compartment Interfaces
The HPTACC, LPTACC, VBV, VSV, modulated turbine cooling, and pylon drain tube/hose left hand side core drain components drain fuel. The A-Sump tube drains oil through the left hand side core drain tubes.
The HPTACC, LPTACC, VBV, VSV, modulated turbine cooling, and pylon drain tube/hose left hand side core drain components drain fuel. The A-Sump tube drains oil through the left hand side core drain tubes.
(7) Right Hand Side Core Drain Lines
The right hand side core drain lines include the pylon drain right hand side, TBV, SBV booster anti-ice, VSV modulated turbine cooling right hand side, VBV, and B-Sump. The pylon interface drain has a tube/hose design. The TBV, VBV, SBV booster anti-ice, and VSV modulated turbine cooling right hand side drains connect to one drain known as the engine right hand side drain.
The right hand side core drain lines include the pylon drain right hand side, TBV, SBV booster anti-ice, VSV modulated turbine cooling right hand side, VBV, and B-Sump. The pylon interface drain has a tube/hose design. The TBV, VBV, SBV booster anti-ice, and VSV modulated turbine cooling right hand side drains connect to one drain known as the engine right hand side drain.
(8) Left Hand Side Core Drain Lines
The left hand side core drain lines include the pylon drain left hand side, HPTACC, LPTACC, VBV, VSV modulated turbine cooling left hand side, and A-Sump. The HPTACC, LPTACC, VBV, and VSV modulated turbine cooling left hand side drains connect to one drain known as the engine left hand side drain.
The left hand side core drain lines include the pylon drain left hand side, HPTACC, LPTACC, VBV, VSV modulated turbine cooling left hand side, and A-Sump. The HPTACC, LPTACC, VBV, and VSV modulated turbine cooling left hand side drains connect to one drain known as the engine left hand side drain.
(9) Pylon Drain Tubes/Hoses
The pylon drain tube/hoses are the drain system for fluids that flow from the pylon. The pylon drains go through the pylon firewall structure and are made of fireproof material.
The pylon drain tube/hoses are the drain system for fluids that flow from the pylon. The pylon drains go through the pylon firewall structure and are made of fireproof material.
(10) Core Compartment Drain Mast
The right hand side and left hand side core compartment drain mast tubes are brazed as an assembly into the core drain mast. The drain tube configuration lets the system drain correctly in all ground and flight conditions.
The assembly includes drains for engine left hand side, engine right hand side, pylon left hand side, pylon right hand side, B-sump, and the A-sump. The core drain mast is a line replaceable unit (LRU).
The right hand side and left hand side core compartment drain mast tubes are brazed as an assembly into the core drain mast. The drain tube configuration lets the system drain correctly in all ground and flight conditions.
The assembly includes drains for engine left hand side, engine right hand side, pylon left hand side, pylon right hand side, B-sump, and the A-sump. The core drain mast is a line replaceable unit (LRU).
C. Turbine Zone
(1) The turbine zone has 2 holes and holes are connected as follows:
(1) The turbine zone has 2 holes and holes are connected as follows:
- C-sump oil
- Turbine Rear Frame (TRF) oil, fuel or water.