Longitudinal Vibrations - Magni Gyro M16C Ordinary Maintenance Manual

5.3.2 L ONGITUDINAL VIBRATIONS
The longitudinal movement of the control stick (nose up and nose down) can be smoothened acting on the tips
of the rotor blades. In particular, it is possible to make the blade tips heavier by laying some tape (1) on the tip
along the blade profile.
This should not be done unless the blades have visibly suffered much damage, such as removal of material and
consequent alteration of weight and of balance of the set.
5.3.3 DIVERGENT VIBRATIONS
When flying, it may happen that the pilot feels a non constant and divergent vibration when he lightens the grab
on the stick, thus releasing the control. These vibrations can be considerably smoothened by following the
procedure of paragraph 3.7 "Frictioning of controls".
NOTE ‐ results of check:
The above mentioned information has to be considered purely indicative as each rotor may have a
different reaction to adjusting procedures.
5.3.4 REDUCTION OF VIBRATIONS
If the pilot feels an increase of vibrations, the following checks are required:
Check the correct tightening of the lock nut pn 283 on the threaded bushing pn 247. Check the tightening of the
control joint bolts (see paragraph 3.7 "Stiffening of controls").
5.3.5 CHECK OF CORRECT TIGHTENING OF LOCK NUT pn 283 ON THREADED
BUSHING pn 247
A slight loosening of the lock nut pn 283 might cause high amplitude vibrations on the control stick, possibly with
vertical vibrations of the gyroplane due to the anomalous misalignment of the hub‐bar pn 245 with the head pn
066.
Checking the tightening of the lock nut pn 283 must be done using the adequate tool MG TO002 and checking
the presence of the marking.
If the tightening of the lock nut pn 283 is found to be incorrect, then proceed as follows:
1. Before starting verify that the engine's ignition key and push‐button are in OFF position and that all the
breakers are switched OFF;
2. Tighten or release the threaded bushing pn 247 to centre the hub‐bar pn 245 with the rotor head (see
DETAIL "A");
3. Tighten the lock nut pn 283;
4. Use a feeler gauge (2) to check if the head pn 066 is symmetrical with the hub‐bar pn 245;
5. Flight test the gyroplane for an evaluation of the vibrations.
If the rotor is not smooth enough because of an excess of vibrations, then proceed with the setting of the
flapping axis:
PAGE
96
M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
ISSUE
A_November 2012