6) Servo Motor - Rotax 914 F Maintenance Manual

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Page Date
220 1997 02 01

13.6.2.6) Servo motor

See Pic. 187.
Place of installation of the servo motor Q depends on type of aircraft but is
limited by the length of the wiring harness and servo cable length to waste
gate.
After switching on the TCU ensure that the automatic check of the servo
motor is performed. During this auto test the complete operating range is
traversed and afterwards the servo motor remains in position correspond-
ing to throttle lever position.
Check for physical damage
When taking the following readings the plug connection with the wiring
harness has to be severed and straight after completion of check re-estab-
lished.
Verification of the nominal resistance:
Take the reading between terminal W and R.
Nominal resistance:
Measuring of the resistance with waste gate closed:
Check the following values with the throttle in 0% position:
Resistance between terminal W and E:
Resistance value:
Resistance between terminal R and E:
Resistance value:
Checking between terminals for power supply T and Y:
Resistance:
ATTENTION: At physical damage or resistance readings
1
ATTENTION: At a renewal of the servo motor verification of
00059
WARNING:
Pic. 187
Main
914 F
7
4,4 ÷ 5,5 kΩ
0 ÷ 70 Ω
4,6 ÷ 5,4 kΩ
5,0 ÷ 20,0 Ω
outside allowance exchange servo motor
without delay.
the relevant values by use of the communica-
tion program (monitoring) is required. See
chapter 13.6.
If this aid is not at your disposal, an engine
trail run has to be performed. See chapter
12.3.22.
If at checking shortcomings arise, then the
engine must not be taken in operation until
trouble is found and rectified.
Reference
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Modification no.
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