Surface/Prop Switch
(Positions for MAX, HI, NORM, and OFF)
NORM mode is the lowest uid ow rate of the system. The ow rate is
achieved by running both metering pumps of the system on a continuous
repeat cycle of operation. The two pumps will run for approximately 30
seconds, then deactivate. After 90 seconds of inactivity, the pumps will again
activate for the 30 second operation period. This on-off cycle of operation
will continue until OFF is selected on the SURFACE/PROP switch.
HI mode is achieved by running one metering pump continuously.
MAX mode is provided for combating heavy or extreme icing conditions and
runs both metering pumps continuously for a period of two minutes. The
MAX position of the SURFACE/PROP switch is spring loaded, so once it
is released from the MAX position the switch is returned to the HI position.
When the 2 minute MAX cycle is complete, the ow rate will transition to
whichever mode is selected on the switch.
Windshield Switch
(Positions for ON and OFF)
The switch is spring loaded to the OFF position.
When ON is selected
momentarily, the windshield pump will run for 4 seconds.
Backup Pump Switch
(Positions for ON and OFF)
BACKUP PUMP mode activates the second metering pump (opposite of the
pump used in the HI mode) and runs continuously like HIGH mode. BACKUP
PUMP mode is independent and isolated from the other ice protection
operational modes. It is provided for redundant capability in the event the
normal operational modes are rendered inoperable.
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