AutoGyro MTOsport, Maintenance Manual

Page: 37 / 191

Manufacturer
Maintenance Manual
AutoGyro
MTOsport
MMM-MT-B_14-11-19 Part B
– Master Servicing Manual (Ch. 00 – 20)
Page 23 of 24
CHAPTER 18
– VIBRATION & NOISE ANALYSIS
Vibration may be induced by the rotor system, the propeller or even the engine. Finding out the cause
for vibration and its proper cure requires experience and special equipment. This is why vibration
analysis and related maintenance can only be performed by specialized service partners
(maintenance level ‘S’), or AutoGyro GmbH, Germany directly.
The following tests or fault isolation procedures should be performed in order to exclude systematic
errors in case of rotor vibration:

rotor system cleanliness

check/verify correct installation position of the shim washers relative to teeter block and teeter
tower (one or two dot markings on block, shim washer and teeter tower must align)

check for possible play in teeter bearing in axial or radial direction

check rotor system alignment (see Job Card 62-11-00 5-1 )

check for possible play in rotor bearing

adjust (increase) rotor control friction (see Job Card 62-32-00 5-1 )
In case of unusual vibration, contact AutoGyro or an AutoGyro specialized service partner. If possible,
try to describe the type of vibration as precise as possible as this will help to save time to reproduce
and troubleshoot, or even allow a first remote assessment. The following table provides a basic
classification.
Vibration appearance / sensation / parameter
Lateral (left-right / back-forth) vibration with approximately 6 per second amplitude
Vertical (up-down) vibration with approximately 12 per second amplitude
Free-stick movement
– carefully release control stick (if possible/safe) and describe path and
displacement of control stick head
Flight condition (weight, speed) with highest vibration level
Rotor RPM
Higher frequency vibration (around 50 Hz, like an electric razor), changing with RPM
Higher frequency vibration, frequency and amplitude significantly changing with power setting,
possibly irregular or erratic
RPM or power setting with highest vibration levels