SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK
Ventus-2cM
FLIGHT MANUAL
(VII)
Emergency switch
(activating the electrical spindle drive extending the propeller pylon)
In case of a failure of the electrical prop extension/retraction control
system, the pylon drive may still be activated with the aid of an emergency
switch.
With the pylon reaching the extreme “extended” position, however, the
spindle drive is no longer automatically cut off by the limit switch as the
latter is overridden on actuating the emergency switch. Therefore the
starter motor will function even in the case of a failure of the limit switch
“propeller extended”.
The emergency switch is situated below the main instrument panel and is
covered by a red guard.
Key held up:
Propeller pylon extends
(green “extended” signal permanently on).
Key held down:
Propeller pylon retracts.
The extreme pylon positions are recognized as follows:
Extended:
Pivoting motion of pylon is stopped by arresting
wire (watch rear-view mirror) and the circuit
breaker will trip.
(If spindle drive circuit breaker trips, reset it instantly).
Retracted:
On reaching the extreme position, the green
“retracted” lights comes on. Spindle drive is cut
off by limit switch.
Note that when extending the propeller pylon via emergency switch, some
measures against operating errors while starting are still in working order,
so for starting the engine it is required that
- the prop arresting device is released
(lever pushed forward)
and
- the ignition is switched “ON”.
CAUTION:
With the red switch guard in “up” position, the starter motor will function
regardlessly of the pylon position – so be cautious on the ground and in
the air!
Never actuate the emergency switch with ignition “ON” !
November
2003
Revision --
7.3.7
Summary of Contents for Ventus-2cM
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