Functional Test of the P4.9 (P5) Sensor System [IAE]

TASK 73-22-51-700-801-A
Functional Test of the P4.9 (P5) Sensor System

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.

1. Reason for the Job
This procedure gives a functional test of the P4.9 (P5) Sensor.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	NITROGEN COMPRESSED SOURCE - GROUND
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V02-141)	corrosion resistant steel lockwire
(Material No.V10-045)	Leak Check Fluid

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
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 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Test the P4.9 (P5) Sensor System
Test the P4.9 (P5) Sensor System

3. Job Set-up
Subtask 73-22-51-941-052-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 73-22-51-010-056-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 73-22-51-040-054-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 73-22-51-010-057-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 73-22-51-210-050-A ** ON A/C NOT FOR ALL

A. Visually inspect the P4.9 (P5) sensing system for damage and/or leaks as follows:
(1) Make sure all the tube connections are not loose.
(2) Make sure that the tubes are not visibly cracked or broken.
(3) Make sure that the tubes are not chafed through at clamping locations.
(4) Make sure that the brackets which support the clamp assemblies are not cracked, broken, or loose.
(5) Make sure that the P4.9 (P5) flexible line that is attached to the P4.9 (P5) pressure inlet port on the EEC is not damaged or frayed.

Subtask 73-22-51-710-050-A ** ON A/C NOT FOR ALL

B. If you find damage, correct as necessary and continue with the procedure.

Subtask 73-22-51-480-050-A ** ON A/C NOT FOR ALL

C. Connect the NITROGEN COMPRESSED SOURCE - GROUND as follows.

Test the P4.9 (P5) Sensor System ** ON A/C NOT FOR ALL

(1) Find the end of the P4.9 (P5) flexible line which is connected to the P4.9 (P5) pressure inlet port at the bottom of the EEC.
(2) Removal of the lockwire.

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.

(a) Remove the lockwire from the B-nut fitting on the P4.9 (P5) flexible line at the EEC inlet.
(3) Disconnect the P4.9 (P5) line from the EEC P4.9 (P5) inlet.
(4) Install the AN6-AN4 reducer fitting to the open end of the P4.9 (P5) flexible line.
(5) Adjust the regulator valve on the portable gas source to 0 psig (0 kPa).
(6) Connect the hose from the portable gas source to the AN6-AN4 reducer fitting.
(7) Supply 30 psig (308.1 kPa) to the P4.9 (P5) system by the NITROGEN COMPRESSED SOURCE - GROUND.

NOTE: The 30 psig (308.1 kPa) must be constantly supplied throughout the leak/flow check procedure.

Subtask 73-22-51-710-051-A ** ON A/C NOT FOR ALL

D. Do a flow check of the P4.9 (P5) system as follows:
(1) While 30 psig (308.1 kPa) is applied to the P4.9 (P5) system, get access to the Turbine Exhaust Case (TEC) strut numbers 4, 7, and 10 (located at the 3, 6, and 9 o'clock positions) through the common nozzle assembly at the rear of the engine.

Test the P4.9 (P5) Sensor System ** ON A/C NOT FOR ALL

(2) Put your bare hands over each one of the TEC struts individually and check for noticeable airflow coming out of the strut at the orifices (8 locations per strut) on the strut itself. Airflow through the struts must be easily found.
(3) If you find no airflow in any of the TEC struts, inspect the P4.9 (P5) tube assembly for blockages or leaks, and correct as applicable.

Subtask 73-22-51-790-050-A ** ON A/C NOT FOR ALL

E. Do a leak check of the P4.9 (P5) system as follows:
(1) With 30 psig (308.1 kPa) applied, use Leak Check Fluid (Material No.V10-045) on all interfacing locations on the external plumbing between the air source at the P4.9 (P5) flexible line and the inlet of the P4.9 (P5) sense line at the TEC.

NOTE: The Leak Check Fluid (Material No.V10-045) must be applied to the outside edge of the flange.

(2) If you find a leak during this process, remove all pressure from the P4.9 (P5) system before troubleshooting.
(3) Fix leaks in fittings by torquing or tightening the fittings to the limits specified in the engine manual. If you found leaks elsewhere such as the tube body or flange interface at the TEC, remove and replace hardware as necessary.

5. Close-up
Subtask 73-22-51-420-052-A ** ON A/C NOT FOR ALL

A. Connection of the P4.9 (P5) line to the EEC P4.9 (P5) inlet.
(1) Disconnect the hose on the portable gas source from the AN6-AN4 reducer fitting.
(2) Remove the AN6-AN4 reducer fitting to the end of the P4.9 (P5) flexible line.
(3) Connect the P4.9 (P5) line on the EEC P4.9 (P5) inlet.

Subtask 73-22-51-481-050-A ** ON A/C NOT FOR ALL

B. Installation of the Lockwire

(1) Install corrosion resistant steel lockwire (Material No.V02-141) into the b-nut fitting on the P4.9 (P5) pressure inlet port (Ref. AMM TASK 70-40-11-911-012).

Subtask 73-22-51-410-054-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 73-22-51-440-052-A ** ON A/C NOT FOR ALL

D. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 73-22-51-410-055-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 03:01:23 UTC