SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Arcus M
FLIGHT MANUAL
12.
Priority selector switch (optional)
Key down:
engine control unit in front panel active
Key up:
engine control unit in rear panel active
Note:
The inactive engine control unit retains all its indicating functions –
the commanding functions, however, are cut off.
To avoid an interruption of the automatic engine control during the
switch over the following conditions should be met before activating
the Priority selector switch:
„
both ignition switches have to be in the same position
„
engine has to be fully retracted or fully extended
„
both manual operation switches have to be in the middle position
Warning
:
With power on, the priority may only be changed if the ignition on
both control units is “ON”, otherwise the engine will stop running.
With power off, the priority may only be changed if the ignition on
both control units is “OFF” in order to prevent the ignition from being
switched on inadvertently.
13.
Emergency switch
(activating the electrical spindle drive which extends the propeller pylon)
In case of a failure of the electrical power plant 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 spin-
dle 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 ex-
tended”.
The emergency switch is situated below the main instrument panel and is
covered by a red guard.
Key held up:
Power plant extends
(green “extended” signal permanently on).
Key held down:
Power plant retracts.
October 2011
Revision --
7.3.20
