Van's Aircraft RV-12, Maintenance Manual

Page: 146 / 217

Rev.5
12-14
the friction lock to hold the throttle control in place. Slide the CT-00101 Stop Nut
back against the forward edge of the conduit in the orientation shown in Figure
27, then tighten the CT-00101 set screw.
21. Restart the engine and confirm that when the throttle is pulled hard to the idle
stop the idle speed is correct and the vacuum gauge readings for the two
carburetors are closely balanced. If they are not, loosen the CT-00101 Stop Nuts
on both carburetors and then repeat steps 19 and 20 until they are.
22. Install the balance tube in the reverse sequence of removal. Any minor
differences in balance at idle will be compensated for by the balance tube at low
engine RPM.
V
ERIFY
F
UNCTIONALITY OF
T
HROTTLE
R
ETURN
S
PRINGS
1. This section must be done with the aircraft outside.
2. Chock main wheels, tie-down tail.
3. BRAKES: Apply FULL
4. Master switch "ON", avionics switch "ON" then power-down transponder, com
radio, and GPS
5. Check EFIS for fuel pressure indication
6. Start engine, check for oil pressure functioning and showing pressure
7. Warm the engine to 122 O F
8. THROTTLE- Completely loosen throttle friction knob and observe throttle
advance rate.
If the throttle advances rapidly to a partial position,
then slowly advances the throttle to full, the springs
are functioning correctly. This may take up to 15
seconds.
If the throttle is not pulled to full, the return springs
and/or throttle cable need to be replaced before
further flight. Consult the RV-12 KAI Section 50.