Removal of the P4.9 Sensor and Manifold [IAE]

TASK 73-22-51-000-010-B
Removal of the P4.9 Sensor and Manifold

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.

FIN: 2004EM1 ** ON A/C NOT FOR ALL
FIN: 2004EM2 ** ON A/C NOT FOR ALL
FIN: 2004EM3 ** ON A/C NOT FOR ALL

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)
No specific	AR	COVER - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
P4.9 Sensor and Manifold

3. Job Set-up
Subtask 73-22-51-941-051-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 73-22-51-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl (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 1M(3 FT) in position.

Subtask 73-22-51-040-051-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser.

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 73-22-51-010-053-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

4. Procedure
Subtask 73-22-51-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the P4.9 Sensor and Manifold:

P4.9 Sensor and Manifold ** ON A/C NOT FOR ALL

(1) Remove the right manifold.
(a) Remove the nut (19) and the bolt (3) which attach the clip (20) to the turbine exhaust case flange.
(b) Cut and discard the wire and disconnect the union nut of the right manifold (4) from the pipe adaptor (18).
(c) Cut and discard the wire and remove the two bolts (1).
(d) Remove the right manifold (4) from the turbine exhaust case.
(e) Remove and discard the two piston rings (2).
(2) Remove the left manifold.
(a) Remove the nut (10) and the bolt (8) which attach the clip (9) to the turbine exhaust case flange.
(b) Cut and discard the wire and disconnect the union nut of the left manifold (11) from the pipe adapter (18).
(c) Cut and discard the wire and remove the two bolts (7).
(d) Remove the left manifold (11) from the turbine exhaust case.
(e) Remove and discard the two piston rings (6).
(3) Remove the pipe adaptor.
(a) Remove the two bolts (14) which attach the two clips (13) to the bracket (12).
(b) Cut and discard the wire and disconnect the union nut of the P4.9 pressure rake tube (17) from the pipe adaptor (18).
(c) Cut and discard the wire and remove the two bolts (15).
(d) Remove the pipe adaptor (18) and the bracket (12) from the turbine exhaust case.
(e) Remove and discard the two piston rings (5).
(4) Put the applicable COVER - BLANKING on all of the openings.

[Rev.10 from 2021] 2026.04.01 03:01:21 UTC