Prerotation Parameters Summary Table - Magni Gyro M16C Ordinary Maintenance Manual

M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
9. The outside observer will now have to verify that the belts pn A28 remain still on the pulleys pn 124 (3)
and are not dragged by these pulleys. If this condition is satisfied, go to the next step. Otherwise proceed
to point 11;
10. Increase the engine r.p.m. to a value between 3500 and 4000. The outside observer will have to verify
that the belts remain still on the pulleys and are not dragged by them. If this condition is satisfied, go to
point 12. Otherwise proceed to point 11;
11. Wait till the rotor r.p.m. is less than 50 and repeat points 4, 5, 6, 7, 8 and 9;
12. It is possible to go for a flight test if the pre‐rotation parameters are similar to the indications of the
following diagram.
3.2.4 PRE ROTATION PARAMETERS SUMMARY TABLE
Reaching the parameters indicated in the above table guarantees the efficiency of the pre‐rotation system.
3.3 REPLACEMENT OF PULLEYS AND BELTS
(See Fig. 3.3/1)
The belts pn A28 and the pulleys pn 124 are subject to a continuous wear in all the operations, except during pre‐
rotation.
The pulley pn 124 and propeller are fixed with six bolts pn 284 to the engine flange; thus its rotation is identical to
the number of revolutions of the engine.
Furthermore, the belts pn A28 are braked whenever they are not tightened through the pre‐rotation system. So,
interference and a continuous slipping are created between the belts and pulleys, which modify the profile of the
pulleys' grooves.
The wear of the pulleys causes a reduction of the performances of the pre‐rotation system, which can be
overcome by following the procedures described in section 3.2.
Because the adjustments described above will no longer be sufficient to bring the system back to full efficiency,
replacement of belts and pulleys is recommended every 500 hours as indicated in the "Ordinary Maintenance
Schedule".
WARNING:
Always use belts and pulleys supplied by Magni Gyro itself, as these parts are run‐in by the
Manufacturer so as to guarantee a soft and progressive coupling, even during the first pre‐ rotations.
Take care to note the position of the belts on the pulley when they are supplied by the Manufacturer or
Area Retailer and do not invert them (as each pair of pulleys is run‐in on its own pulley, each belt
impresses its own groove on that pulley).
ISSUE
A_November 2012
.
Engine RPM
1800
2200 ‐ 2400
Rotor RPM
>160
200
PAGE
41