PURPOSE AND SCOPE

The testprocedure per the applicable Engine Manual does require a vibration check for the low/intermediate and high speed rotorsystems. Release of an engine with high vibrations can result in:

• On-wing vibration complaints, with subsequent troubleshooting

• Rotorsystem failures

• Premature engine removals

Limits are provided for transient conditions and steady state data points.

Troubleshooting recommendations are limited to verification of the proper signal input and tracking.

This practice provides recommendations for:

• Correct cable and transmitter installation and connections

• Calibration

• Recorded data interpretation and data analysis