POWER PLANT DRAIN PRESENTATION
PYLONS DRAINS
Drains are provided at the pylon rear part to evacuate and vent overboard
air and any residual fluid (water, hydraulic, fuel).
ENGINE DRAINS
Drain lines are installed on the engine to collect and drain waste fluids
and vapors from engine systems and accessories.
This drain system consists of a drain collector assembly, which is attached
to the aft side of the accessory gearbox.
It is composed of 4 drain collectors with manual drain valves for trouble
shooting and 2 holding tanks.
DRAIN COLLECTOR ASSEMBLY
A drain manifold module, also attached to the aft side of the accessory
gearbox supports the drain mast.
A pressure valve, which is part of the manifold, opens when the A/C
airspeed reaches 200 kts. Then ram air pressurizes the holding tanks
and the accumulated fluids are discharged overboard through the drain
mast.
DRAIN MAST
The drain mast protrudes through the fan cowl doors into the airstream
to evacuate any residual fluids.
The drain mast is frangible below the cowl exterior surface to prevent
damage to the engine gearbox.
