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M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
3.2.2
SHIMMING PROCEDURE OF PRE‐ROTATION ASSEMBLY
(See Fig. 3.2/1 ‐ 3.2/5)
NOTE:
As regards shimming, it is strongly recommended to follow the instructions given below or to have the
operation done by qualified operators so as to avoid mistakes or malfunction that can jeopardize flight
safety.
1.
Before starting this operation, verify that the engine's ignition key and push‐button are in OFF position
and that all the breakers are switched OFF;
2.
Completely screw in the adjuster pn 127 of the pre‐rotation cable sheath 1,5 x 3.900;
3.
To have a better and easier access to the pre‐rotation assembly pn 117, unscrew the clamping bolts pn
284 and remove the propeller unit pn 125;
4.
Remove the pulley pn 124 from the flange of the propeller as well as the belts pn A28;
5.
Slacken and remove the 4 nuts M6 that fix the pre‐rotation assembly pn 117 to the support pn 120;
6.
Lift the pre‐rotation assembly to have access to the space washers 6x18;
7.
Add a washer to each locking bolt M6x30;
NOTE:
Make sure the washers are all of the same thickness.
8.
Reposition the pre‐rotation assembly pn 117 on the support pn 120 and insert the locking bolts M6x30;
9.
Tighten the nuts M6 to the bolts so as to reduce the movement of the pre‐rotation assembly on the
support pn 120;
10.
Reposition the pulley pn 124 on the flange of the propeller; verify that it rests on the entire surface of the
flange;
11.
Use a ruler (1) to check the alignment between the pulley pn 124 and the pulley of the pre‐rotation
assembly pn 117;
12.
Tighten the locking bolts M6x30 completely, checking that the fibrelock nuts pn M6 are placed correctly.
If this condition is not achieved, replace the nuts M6 with thinner nuts or with longer bolts M6x30;
13.
Reposition the belts pn A28;
14.
Verify that the brake shoe (2) of the belts pn A28 really touches the belts. If this is not the case, set it
correctly (see paragraph 3.2.1, point 5);
15.
Verify that there is a play (even a small one) between the belts pn A28 and the pulleys pn 124;
16.
Reposition the propeller and tighten the locking bolts.
ISSUE
A_November 2012
.
PAGE
39
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