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XT 582 Maintenance Manual
Issue 1.0
September 21st 2005
Page 80
61.10.30 Propeller Bolt Torquing
ONLY after the pitch has been set and confirmed:
Use a calibrated torque wrench, and evenly (side to side) tighten grip bolts, and evenly tighten the bolts
/ nuts in a sequence < bolt 1 – bolt 4 – bolt 2 – bolt 5 – bolt 6 – bolt 3>. Apply the torque to the bolts –
not the nuts.
Figure 57 Propeller M8 Bolt Tightening Sequence Numbers
Torque the ¼” grip bolts to approx 8Nm. Then tighten the engine mounting bolts to the specs below
before returning to the grip bolts and finishing at a
maximum
setting of
11 Nm
(8 ft-pounds / 95 inch-
pounds)
.
If all is well, then proceed to tightening the engine bolts at a
maximum
setting of
13 Nm
(9.5 ft-pounds
/ 115 inch-pounds),
(assuming the drive plate is threaded 5/16” / M8) and backed up by Nyloc nuts at
the same setting. Enure that the torqued bolts do not move when installing the nyloc nuts. DO NOT
EXCEED 13 Nm torque.
Ensure that the washer plate is installed
. If the washer plate is not installed
it is possible that the bolts will become thread bound before applying pressure to the hub, Nyloc nuts
should
not
be reused after the final (full torque) check has been completed. Nyloc nuts must have at
least one full thread showing after they are installed.
61.10.40 Gap Between Hub Halves
It will be noted that when the hub is bolted together, there is a gap between the halves of nearly 1mm.
This is quite deliberate, and will vary slightly as the blade grips are not perfectly circular – generally
.6mm higher than wide. This eccentricity will at times cause a slight mismatch on the outside of the hub
walls.
The advantage of this gap is that at 13Nm torque settings, the gap will not close. The hub in effect
becomes a spring washer, further enhancing mounting assurance. At 13Nm there is a good balance
between engine and grip bolt torque settings.
WARNING
ALWAYS TIGHTEN THE BOLTS IN THE
CORRECT
SEQUENCE
AND
TO
THE
SPECIFIED TORQUE.
WARNING
CLEARANCE BETWEEN WING WIRES, TUBES, AND THE PROPELLER SHOULD ALWAYS BE
MAINTAINED. THIS SHOULD BE CHECKED IN ALL POSSIBLE CONFIGURATIONS OF
PROPELLER AND WING.