Avionics Blower Fan (Air conditioning inlet valve checked open before each flight)

21-26-01B	Avionics Blower Fan (Air conditioning inlet valve checked open before each flight)

Applicable to: -

- During cockpit preparation

Supply the aircraft electrical network.

Check that the air conditioning correctly operates with both air conditioning packs set to on.

Check that the VENT EXTRACT FAULT alert is not displayed on the EWD

If the VENT EXTRACT FAULT alert is displayed on the EWD, the blower fan may be seized. In that case:

Contact the maintenance personnel to exchange the blower fan and the extract fan.

Only the VENT EXTRACT FAULT alert must then be displayed on the EWD.

When the blower and extract fans are exchanged, Refer to item 02 Avionics Extract Fan