Van's Aircraft RV 12iS, Руководство по обслуживанию

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Rev: 2 Date: 11/15/18
1-15
TORQUE VALUES
Torque applied is for the size of the bolt shank not the wrench size. On smaller bolts
use a torque wrench calibrated in inch pounds, not foot pounds
.
When tightening fasteners installed with self-locking nuts or nutplates, the chart
values must be modified. The friction drag torque must be determined and then
added to the standard torque from the table . Due to the friction of the locking device
noticeable torque, known as friction drag (or prevailing) torque, is required just to turn
the nut on the bolt threads and does nothing to actually tighten the parts together and
stretch the bolt (clamp load). Run the nut down to where it nearly contacts the washer or
bearing surface (at least one thread should protrude from the nut) then measure the
friction drag torque required just to turn the nut. Add this friction drag torque to the
standard torque (examples of standard torque values appear in the table below) to get
the final (or total) torque. The final torque is the amount of torque to be applied to the
joint. A snap-over type torque wrench should be set to the final torque.
Refer to the latest version of the Sensenich INSTALLATION AND OPERATION
MANUAL FOR JABIRU AND ROTAX ENGINES DOC#: 2A0 Installation Manual for
torque values and installation details regarding the propeller.
Refer to the latest version of the Rotax Illustrated Parts Catalog for torque values and
installation details regarding the 912ULS engine, and the line and Heavy Maintenance
Manuals for the 912iS.
AN
Bolt
size
Bolt size -
Threads per inch
Standard nuts
AN310, AN315, MS20365
Inch pounds Foot Pounds
AN3 #10-32 20-25 1.6-2.0
AN4 1/4-20 50-70 4.2-5.8
AN5 5/16-24 100-140 8.3-11.6
AN6 3/8-24 160-190 13.3-15.8
AN7 7/16-20 450-500 37.5-41.7
AN8 1/2-20 480-690 40-57.5
AN9 9/16-18 800-1000 66.6-83.3
AN10 5/8-18 1100-1500 91.6-125
(Portions of this information has been adapted from AC 43. 13)