Cirrus Design Section 7
SR20 Airplane and Systems Description
P/N 21399-004 7-25P/N 21399-004 7-25
Wing Flaps
The electrically controlled, single-slotted flaps provide low-speed lift
enhancement. Each flap is manufactured of aluminium and connected
to the wing structure at three hinge points. Rub strips are installed on
the top leading edge of each flap to prevent contact between the flap
and wing flap cove. The flaps are selectively set to three positions:
0%, 50% (16°) and 100% (32°) by operating the FLAP control switch.
The FLAP control switch positions the flaps through a motorized linear
actuator mechanically connected to both flaps by a torque tube.
Proximity switches in the actuator limit flap travel to the selected
position and provide position indication.
Serials 1005 thru 2221: The wing flaps are powered by 28 VDC through
the 10-amp FLAPS circuit breaker on the NON ESS BUS. The flaps
control switch and indicator lights are powered by 28 VDC through the
KEYPADS/AP CTRL circuit breaker on MAIN BUS 1.
Serials 2222 and subs: The wing flaps actuator, flap control switch and
indicator lights are powered by 28 VDC through the 10-amp FLAPS
circuit breaker on the NON ESS BUS.
Flap Control Switch
An airfoil-shaped FLAPS control switch is located at the bottom of the
vertical section of the center console. The control switch is marked
and has detents at three positions: UP (0%), 50% and 100%. The
appropriate V
FE
speed is marked at the Flap 50% and 100% switch
positions. Setting the switch to the desired position will cause the flaps
to extend or retract to the appropriate setting. An indicator light at each
control switch position illuminates when the flaps reach the selected
position. The UP (0%) light is green and the 50% and 100% lights are
yellow.
Revision A1
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