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M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
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.
Loosen the lock nut pn 283;
3.
Rotate the threaded bushing pn 247 a quarter of a turn (90°) clockwise or counter‐clockwise;
4.
Tighten the lock nut pn 283;
5.
Flight test the gyroplane for an evaluation of the vibrations.
Repeat this adjusting of the threaded bushing pn 247 several times, turning it clockwise or anticlockwise until
reaching the best compromise on vibrations. It is very important to move the threaded bushing pn 247 only 90°
at a time, for a maximum displacement of one turn and a half (1,5 mm on the pitch 20x1 of the threaded bushing)
from central position.
6.
Once a satisfying condition has been achieved, mark the position of both the lock nut and threaded
bushing with the special marking paint.
5.4
PRE‐ROTATION SYSTEM ENGAGING ANOMALY
(See Fig. 5.4/1)
If the pre‐rotation system does not get engaged, an inspection is required to identify the anomaly generating the
problem. According to the anomaly found, proceed as described below.
5.4.1
ANOMALY: NO POWER TRANSMISSION, NO SYSTEM ENGAGING
Pulling the control lever pn 415 during pre‐rotation, the system does not get engaged. No strange noises are heard
nor anomalous vibrations are felt.
It is quite likely that there is no power transmission between the propeller pn 125 and the belts pn A28. The belts
pn A28 are not driven or their movement is not sufficient to engage the system.
a.
Verification of the pre‐rotation control line
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.
Make sure the pre‐rotation control cable pn 1,5x3900 is not damaged;
3.
If the cable is broken, replace it as explained in paragraph 3.9.4.
b.
Verification of the tension of the pre‐rotation belts
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.
Pull the pre‐rotation control lever pn 415 until it reaches its stop;
3.
Once this condition is reached, inspect the tension of the belts pnA28 on the relative pulleys pn 124 and (1).
5.4.2
ANOMALY: POWER TRANSMISSION OK, NO SYSTEM ENGAGING
During pre‐rotation the system does not get engaged when pulling the control lever pn 415. Presence of anomalous
vibrations.
The flexible shaft's outer sheath pn 119 gets overheated. In this situation it is very likely that the flexible shaft
pn 118 is rotating even if the system does not work.
a.
Verification of the flexible shaft's entireness
1.
Before starting verify that the engine's ignition key and push‐button are in OFF position and that all the
ISSUE
A_November 2012
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