DOC AIRBUS | AMM A320FStandard Torque Recommendations [CFML]
TASK 70-24-00-910-814-A
Standard Torque Recommendations
1. Reason for the Job
Self explanatory
2. Job Set-up
Subtask 70-24-00-869-050-A
Subtask 70-24-00-911-060-A
[Rev.10 from 2021]
2026.04.01 02:20:48 UTC
Standard Torque Recommendations
1. Reason for the Job
Self explanatory
2. Job Set-up
Subtask 70-24-00-869-050-A
A. Not Applicable.
3. ProcedureSubtask 70-24-00-911-060-A
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 70-24-00-911-061-A (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.
Subtask 70-24-00-911-067-A (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.
C. Triple-torque procedure
(1) Apply TORQUE to specified value.
(2) Loosen to free running
(3) Re-apply TORQUE.
(4) Re-apply TORQUE again.
Subtask 70-24-00-911-066-A (1) Apply TORQUE to specified value.
(2) Loosen to free running
(3) Re-apply TORQUE.
(4) Re-apply TORQUE again.
D. Locking/breakaway (Running torque) procedure
(1) Do a locking/breakaway torque check on each of the 25,4mm diameter engine forward mount self-lock nuts as follows:
(a) Apply anti-seize compound to the threads of the bolt.
(b) Install the nut on the bolt until a minimum of two threads show on the other side of the nut.
(c) Use a torque wrench to loosen the nut. The breakaway torque must be 10,2 N.m minimum
(d) Again install the nut on the bolt until a minimum of two threads show on the other side of the nut.
(e) Use a torque wrench to tighten the nut. The locking torque must be 90,4 N.m maximum.
(2) Do a locking/breakaway torque check on each of the 22,2mm diameter engine rear mount barrel nuts as follows:
(a) Apply anti-seize compound to the threads of the bolt.
(b) Install the bolt in the barrel nut until a minimum of two threads show on the other side of the nut.
(c) Use a torque wrench to loosen the bolt. The breakaway torque must be 7.9 N.m minimum.
(d) Install again the bolt in the barrel nut until a minimum of two threads show on the other side of the nut.
(e) Use a torque wrench to tighten the bolt. The locking torque must be 80 N.m maximum.
(1) Do a locking/breakaway torque check on each of the 25,4mm diameter engine forward mount self-lock nuts as follows:
(a) Apply anti-seize compound to the threads of the bolt.
(b) Install the nut on the bolt until a minimum of two threads show on the other side of the nut.
(c) Use a torque wrench to loosen the nut. The breakaway torque must be 10,2 N.m minimum
(d) Again install the nut on the bolt until a minimum of two threads show on the other side of the nut.
(e) Use a torque wrench to tighten the nut. The locking torque must be 90,4 N.m maximum.
(2) Do a locking/breakaway torque check on each of the 22,2mm diameter engine rear mount barrel nuts as follows:
(a) Apply anti-seize compound to the threads of the bolt.
(b) Install the bolt in the barrel nut until a minimum of two threads show on the other side of the nut.
(c) Use a torque wrench to loosen the bolt. The breakaway torque must be 7.9 N.m minimum.
(d) Install again the bolt in the barrel nut until a minimum of two threads show on the other side of the nut.
(e) Use a torque wrench to tighten the bolt. The locking torque must be 80 N.m maximum.