An air intake for an aircraft forms a first airflow channel (8) for feeding
fresh air into the aircraft, and a second airflow channel (2) for feeding
cooling air to an auxiliary power unit (AP). These first and second airflow channels
are so positioned relative to each other that respective channel inlets or flow
cross-sectional areas can be opened and closed by a single seesaw rocker (4)
which is journaled or hinged between its ends to the aircraft body in such a position
that one end (4A) of the seesaw rocker (4) can close the first channel
(2) while the other rocker end (4B) simultaneously closes the second
channel (8). The seesaw rocker (4) is driven by a motor responsive
to the operation of the auxiliary power unit. When the auxiliary power unit operates,
both channels (2, 8) are open. When the auxiliary power unit does not operate
both channels (2, 8) are closed.
