Purge of the Air Tubing (P2) on Engine 1(2) [IAE]

TASK 73-22-48-870-801-A
Purge of the Air Tubing (P2) on Engine 1(2)

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

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.

ZONE: 400

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	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	AIR SOURCE 5 BAR (72.5 PSI)
No specific	AR	CAP - PROTECTION
No specific	AR	NITROGEN COMPRESSED SOURCE 5 BAR (72.5 PSI) - (DRY)
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 38.5 and 31.5 lbf.in (0.44 and 0.36 m.daN )
No specific	Torque wrench: range to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )
No specific	Torque wrench: range to between 199 and 182 lbf.in (2.25 and 2.06 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V02-099)	lint free cloth
(Material No.V02-141)	lockwire

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-11-50-100-802-A	Local Swab or Wipe Cleaning with Solvent
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-40-11-911-012-A	General Instructions for the Uses of Lockwire
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 73-22-48-000-010-A	Removal of the P2T2 Probe Tube Assembly
TASK 73-22-48-400-010-A	Installation of the P2T2 Probe Tube/Hose Assembly
Electronic Engine Control (EEC) P2T2 Probe Connection
P2T2 Probe Tube and Hose Assemblies

3. Job Set-up
Subtask 73-22-48-941-052-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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 the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-22-48-010-053-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position on the right side of the engine.

4. Procedure
Subtask 73-22-48-020-051-A ** ON A/C NOT FOR ALL

A. Disconnect the P2 hose assembly from the Electronic Engine Control (EEC):

Electronic Engine Control (EEC) P2T2 Probe Connection ** ON A/C NOT FOR ALL

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Remove and discard the lockwire from the flexible hose (2) connector.
(2) Hold the union (1) with the applicable WRENCH - STANDARD.
(a) Disconnect the flexible hose (2).
(3) Do not remove the union (1) from the EEC, but cover it with the CAP - PROTECTION to prevent contamination of the P2 pressure sensor.

Subtask 73-22-48-020-052-A ** ON A/C NOT FOR ALL

B. Disconnect the P2 tube assembly from the P2T2 sensor probe (Ref. AMM TASK 73-22-48-000-010):

P2T2 Probe Tube and Hose Assemblies ** ON A/C NOT FOR ALL

(1) Remove the P2 probe tube access panel:
(a) Remove the 18 bolts (3) from the P2T2 access panel (2).
(b) Remove the P2T2 access panel (2) from the air intake cowl.
(2) Disconnect the P2 tube assembly:
(a) Hold the union (4) with the applicable WRENCH - STANDARD.
1 Disconnect the tube assembly (7) from the union (4).
(b) Cover the union (4) opening with the CAP - PROTECTION to prevent debris intrusion.

Subtask 73-22-48-020-053-A ** ON A/C NOT FOR ALL

C. Purge the P2T2 probe tube and hose assembly:

P2T2 Probe Tube and Hose Assemblies ** ON A/C NOT FOR ALL

(1) Blow out all contamination from the tube assembly (7) and the hose assembly (1) with the NITROGEN COMPRESSED SOURCE 5 BAR (72.5 PSI) - (DRY) or the clean AIR SOURCE 5 BAR (72.5 PSI) for three minutes.
(a) Make sure that the nitrogen or air flows freely through the air tubing.

Subtask 73-22-48-420-051-A ** ON A/C NOT FOR ALL

D. Connect the P2 tube to the P2T2 sensor probe (Ref. AMM TASK 73-22-48-400-010):

P2T2 Probe Tube and Hose Assemblies ** ON A/C NOT FOR ALL

(1) Remove the CAP - PROTECTION and make sure that the union (4) has no debris or contamination.
(a) Clean the open port with the lint free cloth (Material No.V02-099) and cleaning fluid (Ref. AMM TASK 70-11-50-100-802). Use one of the solvents in Table 7, Table 8 or Table 9.
(2) Connect the tube assembly (7) to the union (4).
(3) Hold the union (4).
(a) TORQUE the connector of the tube assembly (7) to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(4) Attach the P2T2 access panel (2) to the air intake cowl with the 18 bolts (3).
(5) TORQUE the bolts (3) to between 38.5 and 31.5 lbf.in (0.44 and 0.36 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 73-22-48-420-052-A ** ON A/C NOT FOR ALL

E. Connect the P2 hose assembly to the EEC:

Electronic Engine Control (EEC) P2T2 Probe Connection ** ON A/C NOT FOR ALL

(1) Remove the CAP - PROTECTION and make sure that the union (1) has no debris or contamination.
(a) Clean the open port with the lint free cloth (Material No.V02-099) and cleaning fluid (Ref. AMM TASK 70-11-50-100-802). Use one of the solvents in Table 7, Table 8 or Table 9.
(2) Connect the flexible hose (2) to the union (1).
(3) Hold the union (1).
(a) TORQUE the connector of the flexible hose (2) to between 199 and 182 lbf.in (2.25 and 2.06 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

(4) Safety the union (1) and the flexible hose (2) connector with the lockwire (Material No.V02-141) (Ref. AMM TASK 70-40-11-911-012).

5. Close-up
Subtask 73-22-48-410-053-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 access platform(s).
(3) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:01:06 UTC