Effectivity: 914 Series BRP-Powertrain page 4-3
OM Edition 2 / Rev. 0 April 01/2010
d05037.fm
4.3) Periodical rise and drop of boost pressure and speed (boost pres-
sure control is surging)
Rise and drop of
boost pressure
and speed
Switching off the servo motor momentarily or permanently, has to
be recorded by the pilot in the logbook, stating the duration, exact
time and duration of switching off.
If this action does not stabilize operation,
switch off servo completely. If need be, re-
duce engine speed until boost pressure and
speed are within the operating limits again.
Orange caution lamp of TCU is not blinking
Possible cause Remedy
Pressure control is not possible. Limited flying operation. Switch off
servo motor for a moment (max. 5
sec).
After a short regulating time opera-
tion should stabilize.
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