Van's Aircraft RV 12iS, Flight Training Supplement

Page: 57 / 90

Revision: 4 Date:
09/08/20
RV-12iS Flight Training Supplement 7-1
SECTION VII
PRE-TAKEOFF GROUND OPERATIONS
INDEX
PRE-START 7-1
ENGINE START 7-1
SYSTEMS POWER-UP 7-1
TAXIING 7-2
BEFORE TAKE-OFF 7-2
PRE-START
See POH Checklist
ENGINE START
See POH Checklist
Note that the POH checklist indicates that after engine start the throttle (912 iS only) needs to be advanced to establish
the engine speed above 2,500 RPM for 5 seconds, then returned to idle speed. This is an important step. Understanding
why this is required is important in understanding how the 912 iS engine electrical system functions.
If the
From POH section 7.7.2:
After engine start, the Rotax 912iS generators will supply power to the engine computers but not the main bus.
After the engine speed exceeds approximately 2,500 RPM for a few seconds the K1/K2 relay shown in (POH)
Figure 7-7 will switch, Generator B will begin supplying power to the main bus and Generator A will supply
power to the engine computers. This transition will be noted on the Gen Amp Meter (Shown on the EFIS screen)
SYSTEMS POWER-UP
After engine start and while the engine warms up, the COM radio and transponder should be set as appropriate,
the ATIS/ASOS information obtained where applicable, and if needed navigation waypoints should be determined.
TAXIING
Taxi operations during high winds require conventional use of the flight controls to compensate for wind effects.
With a head wind or quartering head wind, place the control stick full aft and
deflect the control stick to “turn/roll
into
” the wind. With a tailwind or quartering tailwind, use the opposite procedures. Use of the wheel brakes in
conjunction with the rudder will assist the pilot in maintaining directional control. The primary directional control
during ground operation is the rudder but note that in a tailwind condition rudder authority will be reduced and
reliance on brakes will likely be increased.
Do not “ride” the brakes while taxiing, as light friction on the brakes can
cause them to heat up and become less effective. Brakes should be used only if and where required to augment
the directional control authority provided by the rudder.
During taxi, verify the flight instruments display correctly and agree with known headings.
Be mindful of oil temp/RPM limitations during first taxi of the day. Especially on hot days, coolant temperature can
rise significantly if RPM is low while stationary.
During taxi operations with the canopy in the open position, the canopy must be latched with the Support Plate
Canopy Latch.
See POH Checklist
BEFORE TAKEOFF RUN UP
See POH Checklist