DOC AIRBUS | AMM A320FFunctional Check of the Pressure Relief Door on the Inlet Cowl [CFMB]
TASK 71-11-00-720-001-A
Functional Check of the Pressure Relief Door on the Inlet Cowl
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 71-11-00-940-052-A ** ON A/C NOT FOR ALL
Subtask 71-11-00-720-052-A ** ON A/C NOT FOR ALL
Subtask 71-11-00-940-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 07:30:07 UTC
Functional Check of the Pressure Relief Door on the Inlet Cowl
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | WARNING NOTICE(S) |
| RSE1234 | 1 | ADAPTER TORQUE TOOL |
| REFERENCE | DESIGNATION |
|---|---|
Pressure Relief DoorSubtask 71-11-00-940-052-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
4. Procedure(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 71-11-00-720-052-A ** ON A/C NOT FOR ALL
A. Do a functional check of the pressure relief door as follows:
(1) Calculate the torque wrench force required to open the latch with the formula shown below:
0.53P X L/(L+1.5) where:
Example:
0.53 X 55.8 X 12/(12+1.5) = 29.574 X 12/13.5 = 26.288
The result (26.288) can be rounded to 26 lbf. The torque shown on the torque wrench when the latch releases, with a 12 in. effective length, should be 26 lbf.in (0.29 m.daN) to 32 lbf.in (0.36 m.daN).
(2) Install the RSE1234 ADAPTER TORQUE TOOL on the torque wrench.
(3) Put the torque wrench in the latch release slot.
(4) Measure the effective length of the torque wrench handle and put the hand at that position. Hold the handle with the thumb and the forefinger.
(5) Slowly apply force to the torque wrench. Make sure that the force is applied at a 90 degree angle to the torque wrench handle.
(6) When the latch starts to move, write down the force shown on the torque wrench.
(7) Make sure that the torque wrench force indicated is within the range of values calculated in procedural step 4.A.(1).
(8) If the force required to open the latch is above or below the calculated limits, replace the door latch.
5. Close-up(1) Calculate the torque wrench force required to open the latch with the formula shown below:
0.53P X L/(L+1.5) where:
- P = Latch release load
- L = Torque wrench effective length
NOTE: The torque wrench effective length is the distance between the point of application of force (where the hand is placed on the torque wrench handle) and the center line of the torque wrench 0.375 drive.
The latch release loads for the inlet cowl pressure relief door are between 55.8 lbf (24.8211 daN) and 68.2 lbf (30.3369 daN). Example:
- Latch release load = 55.8 lbf (P = 55.8)
- Torque wrench effective length = 12 in. (L = 12)
0.53 X 55.8 X 12/(12+1.5) = 29.574 X 12/13.5 = 26.288
The result (26.288) can be rounded to 26 lbf. The torque shown on the torque wrench when the latch releases, with a 12 in. effective length, should be 26 lbf.in (0.29 m.daN) to 32 lbf.in (0.36 m.daN).
(2) Install the RSE1234 ADAPTER TORQUE TOOL on the torque wrench.
(3) Put the torque wrench in the latch release slot.
(4) Measure the effective length of the torque wrench handle and put the hand at that position. Hold the handle with the thumb and the forefinger.
(5) Slowly apply force to the torque wrench. Make sure that the force is applied at a 90 degree angle to the torque wrench handle.
(6) When the latch starts to move, write down the force shown on the torque wrench.
(7) Make sure that the torque wrench force indicated is within the range of values calculated in procedural step 4.A.(1).
(8) If the force required to open the latch is above or below the calculated limits, replace the door latch.
Subtask 71-11-00-940-053-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).