DOC AIRBUS | AMM A320FInspection/Check of the Antisiphon Device [CFMB]
TASK 79-00-00-280-002-A
Inspection/Check of the Antisiphon Device
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 79-00-00-941-057-A ** ON A/C NOT FOR ALL
Subtask 79-00-00-280-051-A ** ON A/C NOT FOR ALL
Subtask 79-00-00-410-057-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:38:54 UTC
Inspection/Check of the Antisiphon Device
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2442) | engine oil |
| (Material No.CP8001) | lockwire 0.032 in. (0.8 mm) dia. |
| (Material No.CP8002) | lockwire 0.032 in. (0.8 mm) dia |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 100 | O-RING | AIPC 79-00-00-02-210 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-710-006-B | Minimum Idle Check |
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 79-00-00-210-003-A | Visual Inspection of the Oil System |
Check of the Antisiphon DeviceSubtask 79-00-00-941-057-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 that 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 that 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 79-00-00-010-057-A ** ON A/C NOT FOR ALL (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 that 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 that 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).
B. Open the fan cowls doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
Subtask 79-00-00-280-051-A ** ON A/C NOT FOR ALL
A. Check of the Antisiphon Device
(2) Disconnect the coupling nut (80) of the antisiphon hose (70) from the nipple (90) of the antisiphon device. Keep the antisiphon hose.
(3) Blow, with compressed air, into the antisiphon hose (70) to make sure that there is no blockage.
(4) Loosen the 4 attachment bolts (110) of the lubrication unit supply line (from antisiphon assembly) sufficiently to allow air passage.
(5) Blow, with compressed air, through the nipple (90) to make sure that the restrictor is free of blockage.
(6) If the restrictor is blocked, remove the lockwire and remove the nipple (90). Remove and discard the O-ring (100).
(7) Clean the restrictor of the antisiphon device.
(8) Install the nipple on the antisiphon assembly as follows.
(a) Lubricate a new AIPC 79-00-00-02-210 O-RING (100) with engine oil (Material No.CP2442) . Install the O-ring on the nipple (90).
(b) Install the nipple (90) on the antisiphon assembly. TORQUE to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
. Safety with a CP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
(9) Attach the lubrification unit supply line to the forward flange connection of the antisiphon assembly with the 4 bolts (110). TORQUE the bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN ).
(10) Connect the antisiphon hose (70) to the nipple (90) of the antisiphon assembly and to the forward sump oil supply line. TORQUE the union nuts (60 and 80) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN ).
(11) Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006). Do a check for leaks (Ref. AMM TASK 79-00-00-210-003).
5. Close-upCAUTION:
USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.
(1) Disconnect the coupling nut (60) of the antisiphon hose (70) from the forward sump oil supply line. (2) Disconnect the coupling nut (80) of the antisiphon hose (70) from the nipple (90) of the antisiphon device. Keep the antisiphon hose.
(3) Blow, with compressed air, into the antisiphon hose (70) to make sure that there is no blockage.
(4) Loosen the 4 attachment bolts (110) of the lubrication unit supply line (from antisiphon assembly) sufficiently to allow air passage.
(5) Blow, with compressed air, through the nipple (90) to make sure that the restrictor is free of blockage.
(6) If the restrictor is blocked, remove the lockwire and remove the nipple (90). Remove and discard the O-ring (100).
(7) Clean the restrictor of the antisiphon device.
(8) Install the nipple on the antisiphon assembly as follows.
(a) Lubricate a new AIPC 79-00-00-02-210 O-RING (100) with engine oil (Material No.CP2442) . Install the O-ring on the nipple (90).
(b) Install the nipple (90) on the antisiphon assembly. TORQUE to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
. Safety with a (9) Attach the lubrification unit supply line to the forward flange connection of the antisiphon assembly with the 4 bolts (110). TORQUE the bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )
. (10) Connect the antisiphon hose (70) to the nipple (90) of the antisiphon assembly and to the forward sump oil supply line. TORQUE the union nuts (60 and 80) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
. (11) Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006). Do a check for leaks (Ref. AMM TASK 79-00-00-210-003).
Subtask 79-00-00-410-057-A ** ON A/C NOT FOR ALL