DOC AIRBUS | AMM A320FTightening Torques [CFMB]
TASK 70-23-00-911-002-A
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
Subtask 70-23-00-869-051-A ** ON A/C NOT FOR ALL
Subtask 70-23-00-911-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:18:56 UTC
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
Subtask 70-23-00-869-051-A ** ON A/C NOT FOR ALL
A. Not Applicable.
3. ProcedureSubtask 70-23-00-911-051-A ** ON A/C NOT FOR ALL
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.
(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.
Subtask 70-23-00-911-053-A ** ON A/C NOT FOR ALL (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.
(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.
B. Double-torque procedure.
(1) Tighten at a uniform rate, in a criss-cross sequence if necessary, to the specified torque value.
(2) Loosen by 1/4 to 1/2 turn, and re-tighten, one by one in sequence to the specified torque value. Do not tighten more than the specified torque value.
(3) Clean unwanted lubricant, if necessary.
(4) Make sure that you get the specified torque value with the torque wrench already used.
(1) Tighten at a uniform rate, in a criss-cross sequence if necessary, to the specified torque value.
(2) Loosen by 1/4 to 1/2 turn, and re-tighten, one by one in sequence to the specified torque value. Do not tighten more than the specified torque value.
(3) Clean unwanted lubricant, if necessary.
(4) Make sure that you get the specified torque value with the torque wrench already used.