CFM 56 Power Plant Presentation

 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.

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