DOC AIRBUS | AMM A320FENGINE AND PYLON DRAIN SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. Description of the Engine and Pylon Drain System
Engine and Pylon Drain System(1) The engine drain system collects waste fluids and vapor from seal leakage or overflow of the Main Gearbox (MGB) mounted components and ecology tank. The fluids collected are released through the drain mast on the lower bifurcation beam of the nacelle. The MGB mounted components have individual drain tubes to release fluid buildup of the components. The engine drain system relies on gravity to move the waste fluids to the drain mast.
(2) The scupper drain tube releases oil when oil is spilled or there is an overflow.
(3) The breather tube releases air/oil mixture from the engine gearbox deoiler to the external side of the nacelle.
2. Component Description and Operation
A. Engine Drain System
(1) The engine drain system extends from the engine accessories at the bottom of the gearbox to the lower bifurcation beam of the nacelle.
The engine drain system parts are:
The engine drain system parts are:
- 2.5 Bleed Actuator Drain Tube
- High Pressure Compressor (HPC) Stator Vane Actuator (SVA) Primary and Secondary Drain Tubes
- Low Pressure Compressor (LPC) SVA Drain Tube
- Integrated Fuel Pump and Control (IFPC)
- Pylon Drain Tubes
- Ecology Tank Drain Tube
- Engine Driven Pump (EDP) Drain Tube
- Gearbox Drain Tube
- Gearbox Bracket
- Clamp Block
- Drain Mast.
B. Engine Drain Tubes
(1) The engine drain tubes are attached with the gearbox bracket and come together to a drain mast at the clamp block. The MGB bracket assembly provides support and reduces horizontal stiffness. The clamp block is located below the MGB bracket. The bracket and drain mast secures the drain tubes above the drain mast exit. The drain mast interfaces with the latch access panel fire seals at the drain mast exit. The drain mast supplies a flexible interface with the thrust reverser and allows for side-to-side and forward-and-aft movement.
C. Gearbox Breather Tube
(1) The gearbox breather tube consists of a tube end fitting with a flange that is bolted to the gearbox deoiler exit pad. A seal between the tube flange and the gearbox deoiler prevents fluid leakage. Support brackets are bolted to the flanges of the engine cases and allows the tube for forward and aft flexibility to account for thermal expansion. The exit of the gearbox breather tube joins with the No. 4 bearing compartment drain line into the scupper.