Inspection/Check of the P3B Line [CFML]

TASK 72-00-00-210-821-A
Inspection/Check of the P3B Line

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 410
ZONE: 420

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	SCRIBE
No specific	AR	WARNING NOTICE(S)
No specific	1	WIRE - PLASTIC
No specific	Torque wrench: range to between 0.79 and 0.68 m.daN (70 and 60 lbf.in )
No specific	Torque wrench: range to between 3.48 and 2.96 m.daN (26 and 22 lbf.ft )
No specific	Torque wrench: range to between 3.39 and 3.05 m.daN (25 and 22 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2011)	stoddard solvent
(Material No.CP2442)	engine oil
(Material No.CP2559)	ardrox 552
(Material No.CP2560)	turco ind 79
(Material No.CP2566)	mag-chem teksol
(Material No.CP2584)	degreasol 99 R
(Material No.CP2656)	mag-chem skysol
(Material No.CP8001)	safetywire
(Material No.CP8002)	safetywire

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-00-00-200-815-A	Inspection of Engine Tubes, Hoses and Fittings
TASK 73-21-70-000-803-A	Removal of the P3B Line
TASK 73-21-70-400-803-A	Installation of the P3B Line
TASK 73-29-00-740-803-A	Idle Test (Menu Mode)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
P3B Line

3. Job Set-up
Subtask 72-00-00-941-263-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 72-00-00-010-367-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 72-00-00-040-174-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-00-00-010-368-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 72-00-00-210-184-A

A. Visual Inspection of the P3B Line
(1) Examine the P3B line (Ref. AMM TASK 72-00-00-200-815).

Subtask 72-00-00-280-094-A

B. Drying-out and Cleaning of the P3B Line
(1) Cut and remove the safetywire.
(2) Remove the bolt (5) that attaches the loop clamp (4) and the P3B tube (2) to the bracket (6).
(3) Disconnect the P3B tube (2) from the pressure sub system (1).
(4) Disconnect the P3B-S tube (11) from the Environmental Control System (ECS) air duct (14) as follows:
(a) Remove the bolt (13) that attaches the loop clamp (12) and the P3B-S tube (11) to the bracket (7).
(b) Cut and remove the safetywires.
(c) Disconnect the P3B-S tube (11) from the ECS air duct nipple.
(d) Remove the tube nipple from the ECS air duct (14).
(5) Check the P3B tube (2) for blockage. A blocked tube is not serviceable:
(a) Replace the P3B tube (2).
(6) Blow clean dry air into the P3B tube (2) end to remove any dirt or water accumulation in the P3B line.

Subtask 72-00-00-280-095-A

C. Removal of the P3B Line Connections

NOTE: Do the steps that follow only if you suspect leakage.

(1) Remove the P3B tube (2) (Ref. AMM TASK 73-21-70-000-803).
(2) Cut and remove the safetywire that safeties the tube bundle (3) on the P3B-S tube (11).
(3) Disconnect the P3B-S tube (11) from the tube bundle (3).
(4) Remove the bolt (8) and the loop clamp (9) that attach the P3B-S tube (11) to the support bracket (10).
(5) Remove the bolt (13) and the loop clamp (12) that attach the P3B-S tube (11) to the exciter box and bracket (7).
(6) Remove the P3B-S tube (11).

Subtask 72-00-00-210-185-A

D. Inspection of the P3B Line Connections
(1) Examine the connecting parts as follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fitting nuts for:
A.Damaged corners	Any amount, if the correct torque can be obtained	Chase the threads.
B.Safety wire hole deformation and wear	Serviceable, if the metal around the hole is not cracked or torn.
2.Fittings and tube nipple seating surfaces for:
A.Circumferential scratches	Any amount not detectable with a 0.04 in. (1.02 mm) radius ball SCRIBE.
B.Axial scratches	Not serviceable	Replace the tube or the part.
C.Nicks, pits	Not serviceable	Replace the tube or the part.

(2) If necessary, clean the parts with stoddard solvent (Material No.CP2011) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or ardrox 552 (Material No.CP2559) or mag-chem skysol (Material No.CP2656) or acetone (Material No.CP1039) or isopropyl alcohol (Material No.CP1041) .
(3) If necessary, remove the dirt from the pressure sub system (1) nipple with a WIRE - PLASTIC. Take care to not introduce dirt into the pressure sub system (1).
(4) Check the tube bundle weep hole for clogging or dirt accumulation.
(5) If necessary, clean the tube bundle weep hole with stoddard solvent (Material No.CP2011) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or acetone (Material No.CP1039) or isopropyl alcohol (Material No.CP1041) or a WIRE - PLASTIC and ardrox 552 (Material No.CP2559) .

Subtask 72-00-00-420-108-A

E. Installation of the P3B Line

CAUTION: DURING INSTALLATION, MAKE SURE THAT THE P3B LINE DOES NOT TOUCH THE LOWER STARTER DUCT OR OTHER PARTS IN THIS AREA. IF IT DOES, CHAFING OF THE P3B CAN OCCUR.

(1) Connect the coupling nut on the P3B-S tube (11) to the ECS air duct (14).
(2) TORQUE the coupling nut that connects the sense line P3B-S tube (11) to the ECS air duct (14) to between 3.48 and 2.96 m.daN (26 and 22 lbf.ft )

.
(3) Safety the nipple of the ECS air duct (14) on the coupling nut of P3B-S tube (11) with safetywire (Material No.CP8001) or safetywire (Material No.CP8002) .
(4) Connect the P3B-S tube (11) on the tube bundle (3).
(5) Lubricate the threads of the bolt (8) and the bolt (13) with engine oil (Material No.CP2442) .
(6) Install the bolt (8) that attaches the loop clamp (9) and the P3B-S tube (11) to support bracket (10) hand-tight.
(7) Install the bolt (13) that attaches the loop clamp (12) and the P3B-S tube (11) to the exciter box and the bracket (7) hand-tight.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(8) TRIPLE TORQUE the coupling nut of the P3B-S tube (11) as follows:
(a) TORQUE the coupling nut of the P3B-S tube (11) to between 3.39 and 3.05 m.daN (25 and 22 lbf.ft )

.
(b) Loosen the coupling nut of the P3B-S tube (11) until it turns freely.
(c) TORQUE the coupling nut of the P3B-S tube (11) to between 3.39 and 3.05 m.daN (25 and 22 lbf.ft )

.
(d) TORQUE the coupling nut of the P3B-S tube (11) to between 3.39 and 3.05 m.daN (25 and 22 lbf.ft )

.
(9) Safety the nipple of the tube bundle (3) and the coupling nut of the P3B-S tube (11) with safetywire (Material No.CP8001) or safetywire (Material No.CP8002) .
(10) TORQUE the clamp bolt (13) and the bolt (8) to between 0.79 and 0.68 m.daN (70 and 60 lbf.in )

.
(11) Install the P3B tube (2) (Ref. AMM TASK 73-21-70-400-803).

5. Close-up
Subtask 72-00-00-410-318-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 72-00-00-440-164-A

B. Reactivation of the Thrust Reverser System for Maintenance
(1) Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-00-00-410-319-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) If P3B tube was disconnected or replaced, do an idle test (Ref. AMM TASK 73-29-00-740-803).

[Rev.10 from 2021] 2026.04.01 02:50:57 UTC