Gen II User Manual
9-22 – Transient Balance Chapter 9 Revision 2.10, Apr 2020
9.2.5. – Start Aircraft for Acceleration (Run 1)
9.2.5.1. The “Start Aircraft” banner screen, shown below, will be displayed with several
informational messages. The Run number indicates which run of the balance job is
currently being collected. The second line states “Perform FOD check, start engine
per flight manual and set engine(s) to idle.” Start the engine using normal procedures
and allow the engine to warm up to normal operating temperatures. When warm up is
complete, allow the engine to stabilize at speed, make any minor adjustments as
necessary, and then press [OK] to continue. Use the [F3] “+/- Pol.” key to reverse the
polarity of the Tach Signal. If the Current RPM is erratic at a stable engine speed,
press this key in an attempt to stabilize the reading. This option may be necessary
when either of the Tooth settings, “Mod Tth” or “Adj Tth”, are selected on some
engines.
9.2.5.2. The analyzer will display the data acquisition screen as shown below. It will display
“Acceleration” or “Deceleration” depending on the selections made in paragraphs
9.1.3.2 and 9.1.3.3 above. The screen will display the “Current RPM:” and its
corresponding “N1%”. Also displayed are the current vibration levels for all sensors
configured in the setup. The “Acceleration/Deceleration Rate:” displays a status of
either “Good” or “Too Fast”.
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