76-00-00
page 50
May 01/2007
Effectivity 914 Series
Edition 1 / Rev. 0
d02626
BRP-Rotax
Maintenance Manual
3.1.2.7) Servo motor
See Fig. 76-48
The installation location of the servo motor (1) depends on the
aircraft type but is limited by the length of the wiring harness
and bowden cable length to wastegate.
- After switching on the TCU, ensure that the automatic self
check of the servo motor is performed. During this auto test
the complete operating range is traversed and afterwards
the engine remains in position corresponding to throttle
lever position.
- Inspection for physical damage.
When taking the following readings, the plug connection with
the wiring harness must be disconnected and reestablished
immediately after completion of the check.
â– CAUTION: In the event of physical damage or resistance
readings outside allowance, replace the part
without delay.
- Measurement of the nominal resistance:
Measure resistance between connections (2) and (4).
Nominal resistance: 4.4 to 5.5 kΩ
- Measuring the resistance with wastegate closed:
Check the following values with the throttle in 0% position:
Resistance between the terminals (2) and (3):
Resistance value: 0 to 70 Ω
Resistance between the terminals (4) and (3):
Resistance value: 4.6 to 5.4 k
- Checking between terminals (5) and (6) for power supply:
Resistance value: 5.0 to 20.0 Ω
â– CAUTION: When replacing the servo motor, verification
of the relevant values using of the communi-
cation program (monitoring) is required. See
76-00-00 sec. 3.1.
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