Check Free Flow Through Antisiphon Device [CFMI]

TASK 79-00-00-200-003-A
Check Free Flow Through Antisiphon Device

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	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )
No specific	Torque wrench: range to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
50	O-RING	AIPC 79-00-00-05-210

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-006-A	Minimum Idle Check
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 79-00-00-210-005-A	Visual Inspection of the Oil System
Antisiphon Assembly

3. Job Set-up
Subtask 79-00-00-941-050-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 79-00-00-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

4. Procedure
Subtask 79-00-00-280-050-A ** ON A/C NOT FOR ALL

A. Check of the Antisiphon Assembly.
(1) Disconnect the coupling nut (10) of the antisiphon tube (20) from the forward sump oil supply line.
(2) Disconnect

CAUTION: 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.

(a) Disconnect the coupling nut (30) of the antisiphon tube (20) from the nipple (40) of the antisiphon assembly.
Keep the antisiphon tube (20).
(3) Blow, with compressed air, into the antisiphon tube (20) to make sure that there is no blockage.
(4) Loosen the 4 attachment bolts (60) of the lubrication unit supply line (from antisiphon assembly) sufficiently to allow air passage.
(5) Blow, with compressed air, through the nipple (40) to make sure that the restrictor is free of blockage.
(6) If the restrictor is blocked, remove the lockwire and remove the nipple (40). Remove and discard the O-ring (50).
(7) Clean the restrictor of the antisiphon assembly.
(8) Install the nipple on the antisiphon assembly as follows.
(a) Lubricate a new AIPC 79-00-00-05-210 O-RING (50) with engine oil (Material No.CP2442) . Install the O-ring (50) on the nipple (40).
(b) Install the nipple (40) on the antisiphon assembly. TORQUE to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

. Safety with a CP8001lockwire 0.032 in. (0.8 mm) dia. or with a CP8002lockwire 0.032 in. (0.8 mm) dia.
(9) Attach the lubrication unit supply line to the forward flange connection of the antisiphon assembly with the 4 bolts (60) TORQUE the bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )

.
(10) Connect the antisiphon tube (20) to the nipple (40) of the antisiphon assembly and to the forward sump oil supply line. TORQUE the coupling nuts (10) and (30) to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

Subtask 79-00-00-869-050-A ** ON A/C NOT FOR ALL

B. Make sure that the work area is clean and clear of tools and other items.

Subtask 79-00-00-942-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

Subtask 79-00-00-710-050-A ** ON A/C NOT FOR ALL

D. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006) and do a check for leaks (Ref. AMM TASK 79-00-00-210-005).

5. Close-up
Subtask 79-00-00-410-050-A ** ON A/C NOT FOR ALL

A. Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

[Rev.10 from 2021] 2026.04.01 03:37:36 UTC