Air

The air system provides clean air for the operation of the turbine engine and an indication of its status. It consists of the air indicating and the air intake foreign object removal.

Air indicating

The air indicating gives the status of the air intake foreign object removal. It consists of the Inlet Barrier Filter (IBF) pressure switch.

The IBF pressure switch is located on the left outboard side of the air intake assembly. It is normally open and is a differential pressure switch that senses the difference in pressure between ambient air and air intake.

Operation

The IBF pressure switch is connected to the air intake through a tube and the other side is vented to ambient air. It closes when the differential pressure between ambient air and air intake exceeds a threshold. A ground is applied to the GEA engine and airframe interface unit. The Caution and Alerting System (CAS) caution message IBF CLOGGED is shown on the Primary Flight Display (PFD).

Air intake foreign object removal

The air intake foreign object removal removes contaminants from the air before it enters the engine. It consists of the Inlet Barrier Filter (IBF) assembly and the flapper valve assemblies.

Inlet Barrier Filter (IBF) assembly The IBF assembly is located over the engine intake. It is a corrugated filtering media inside a structural support to give it rigidity. A retainer is easily removed to allow servicing of the filter elements.

Flapper valve assemblies

The flapper valve assemblies are located on each side under the air intake floor. They provide a drain path for water that may accumulate inside the air intake.

Operation

When the engine is operating, the IBF assembly filters the engine intake air.

The vacuum caused by the operating engine pulls the flapper valve assemblies shut.

When the engine is not operating, the flapper valve assemblies open and permit any trapped water to drain.