Van's Aircraft RV 12iS, Flight Training Supplement

Page: 53 / 90

Revision: 4 Date:
09/08/20
RV-12iS Flight Training Supplement 6-5
NOTE With Garmin GTR-200 installed, Stall warning tone is only audible with the avionics switch ON.
When a GTN-650Xi NAV/COM is installed, turning on the Avionics switch turns on both the NAV and COM functions of
the GTN-650Xi as well as the transponder.
DIMMER KNOB: Turning this knob dims the switch lights, instruments. This knob will also dim the roll-bar-mounted
cabin light, if installed and when the NAV lighting switch is in the on position.
NAV & NAV/STROBE SWITCH: Turning this switch on in either position will turn on the cockpit mounted roll bar light.
Turning the switch to the NAV position turns on the navigation and position lights on the wingtips. This is useful if you
wish to turn off the strobes to prevent blinding another person in the area. Placing the switch in the NAV/STROBE
position will turn on navigation, position and strobe lighting.
LANDING LIGHT SWITCH: This switch controls power to the landing light(s) (if installed) and controls whether the light
is on continuously (for illumination during night landing operations) or whether the light(s) pulse on/off/on (for enhanced
recognition visibility to other aircraft).
PTT (PUSH TO TALK) SWITCH: There is a push to talk switch located on the front of the control grip, plus a single
push to talk switch located on the right side of the panel. When the aircraft is used for training the panel-mounted switch
allows the instructor to manage radio communications without affecting movement of the control stick.
AUTOPILOT DISCONNECT SWITCH: There is an autopilot disconnect switch on the control stick grip and a second
switch of the same function on the center console. There is no autopilot power switch in the aircraft. Instead, the
autopilot is turned on with the master but is not activated. For Garmin installations, activating the autopilot allows auto-
trim to be active. To activate the autopilot and allow autopilot control of the aircraft, use the autopilot switch or
appropriate functions on the EFIS screen. Refer to your EFIS system manual for information about how to engage the
autopilot (there may be multiple functions depending on how the button is pressed). For Garmin ESP information,
please see Section 11.
FUEL PUMP SWITCHES: These switches are provided only on Rotax 912iS aircraft. The aircraft should be started with
only one fuel pump switch on. Using both fuel pumps during engine start could cause damage to the engine per the
manufacturer. Both fuel pumps should be activated after the engine has been started and while in flight.
WARNING!
The Rotax 912 iS is designed to use both fuel pumps in flight. Do not turn off one of the pumps in flight. Both
pumps running together provide the fuel pressure necessary for optimal engine performance. In addition, if the
single operating pump would fail, the engine would stop leading to possible injury or death.
WARNING!
The Rotax 912 ULS does not have a fuel pump switch installed. The fuel pump is a continuous-duty design. The
only means of controlling the auxiliary electric fuel pump is pulling the Fuel Pump fuse. Turning off the fuel
pump in flight may cause vapor lock especially in hot operating conditions. This may lead to possible injury or
death. While fuel pump switches may be common on aircraft using other engine types (Lycoming, Continental,
etc.) a fuel pump switch should not be used on this aircraft! The fuel pump should not be turned off in flight!
EMERGENCY BACKUP BATTERY SWITCH: Turn this switch on in an emergency if both generators fail to provide
electrical power to the computers (Lane A and Lane B) of the Rotax 912 iS engine. The switch provides a direct (non-
fused) connection between the main aircraft bus and Bus A/Lane A within the Rotax 912 iS Fuse Box Module.
Leaving this switch on accidentally will not harm the engine, but as stated above this is a non-fused connection. Power
normally flows through the 30A Generator Main Bus fuse. A short in the electrical system with the emergency power
switch left on could damage the emergency backup battery circuit and possibly lead to a fire. For this reason the
emergency backup battery switch should only be used in an emergency.
START POWER SOLID STATE SWITCH: This switch is internal to, and automatically controlled by, the RV-12iS
electrical system. The Rotax 912 iS installation manual specifies the use of a start power switch which when connected
supplies power from the Main Bus to Bus A and Bus B of the engine. This turns on the engine computers (Lane A and
Lane B), provides engine sensor data to the EFIS and provides power to start the engine. The RV-12iS automatically
detects that the master switch has been turned on and that the engine is not running (Bus A voltage will be below 13.7
volts) and automatically activates the start power switch for the pilot. As soon as the engine begins to run the start
switch is automatically shut off. Turning the ignition key switch to the start position will also turn on the start power solid
state switch.