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R 4_ Perform the process of paragraph D.(6).
R 5_ Find the center of the safety cable in the test block. Use
R light finger pressure and push the center of the safety cable
R toward the wall on the test block. The safety cable must not
R touch the wall.
R 6_ If the safety cable touches the wall, the safety cable is not
R serviceable. Cut and remove the safety cable from the test
R block. Install a new safety cable and do the pulloff load test
R again. If the cable touches the wall again, remove the
R crimping tool from service.
R 7_ Move the torque wrench handle counter-clockwise until the
R torque wrench clicks or the ferrules moves. If the ferrule
R moves before you hear the torque wrench click, remove the
R crimping tool from service.
R 8_ Find the center of the safety cable in the test block. Use
R light finger pressure and push the center of the safety cable
R toward the wall on the test block. If the safety cabkle does
R not touch the wall the crimping tool can be release for
R service.
R (Ref. Fig. 203/TASK 70-22-00-991-302)
R 9_ If the safety cable touches the wall, the safety cable is not
R serviceable. Cut and remove the safety cable from the block
R test. Do the pulloff load test again with a new cable. If the
R new safety cable is unserviceable, remove the crimping tool
R from service.
R (b) Do a test to determine the exact amount of pressure necessary to
R cause the crimped ferrule or safety cable to fail. It is
R recommended that this test be done a minimum of once a mounth.
R Use a safety cable tester to do this test. Do this test according
R to the manufacturer's instructions. This test can also be used as
R an alternative to the test block test.
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TIGHTENING TORQUES - MAINTENANCE PRACTICES
__________________________________________ TASK 70-23-00-911-002 Tightening Torques
1. Reason for the Job
__________________
The information given in the following paragraphs is generally applicable to
all threaded fasteners, such as bolts, nuts and fittings.
The torque values are given in the next whenever needed and at the location
where needed.
2. Job Set-up Information
______________________
Not Applicable
3. Job Set-up
__________ Subtask 70-23-00-869-051
A. Not Applicable.
4. Procedure
_________ Subtask 70-23-00-911-051
A. Tightening torques.
(1) When tightening nuts, specified torque values must be applied. These torque values are given to ensure an optimum tightening for safety purposes.
(2) On flanges where there are a great number of bolts and nuts, the tightening sequence must be performed in pairs of bolts diametrically opposed.
(3) On these same flanges, it is recommended to proceed to a final check, clockwise, to ensure that all the nuts have been tightened to the specified torque values.
(4) Tighten at a uniform rate until the specified torque is obtained. In some cases, where gaskets or other parts cause a slow permanent set, be sure to recheck the torque at the desired value after the material is seated.
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(5) Do not tighten to the final torque value during the first draw-down; uneven tension can cause distortion or over-stressing of parts. Seat mating parts by drawing down the bolts in gradual increments until the parts are firmly seated. Complete the tightening procedure by loosening each fastener separately, then tighten to the specified torque value. Do not exceed the maximum torque values specified by this manual.
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