6) Check Of The Waste Gate; 7) Checking Of Propeller Gearbox - Rotax 914 F Maintenance Manual

12.3.6) Check of the waste gate

See Pic.
Inspect servo cable of waste gate actuation Q for physical damage and wear.
I CAUTION:
Check also cable engagement and spring.
Verify adjustment of waste gate.
N NOTE:
In this position the waste gate has to be completely closed. If necessary reset
by adjustment screw W. See chapter 13.5)
Pic. 39

12.3.7) Checking of propeller gearbox

Checking of backlash
With engine at standstill, the propeller can be turned by hand by approx. 15°
taking into consideration a slight friction torque. Thereby no odd noises or
irregular resistance must be noticeable. Otherwise repair is necessary.
Checking of the friction torque
Within the backlash the torque by friction is 15 to 45 Nm (130 to 400 in.lb). This
value is calculated by the indication of the spring scale multiplied by length
of lever arm (N x m = Nm). If the above mentioned friction torque is not
achieved, remove gearbox and inspect it. See Chapter 14.4).
Modification no.
- 0 -
Use of a damaged servo cable is not permitted. Even with
only one of the strands worn through, the cable has to be
renewed. See chapter 13.5)
After engine stop, the servo motor will move into closed
position.
The same happens after switching on the TCU. The servo
motor rotates approx. half a turn and will then remain in the
closed position.
1
2
Reference
00147
Main Date
914 F 1997 02 01
Page
93