Ground Run for Additional Particle Collection [CFMB]

TASK 79-00-00-281-006-A
Ground Run for Additional Particle Collection

1. Reason for the Job
This task is to continue to troubleshoot findings from the Electrical Master Chip Detector (EMCD) and to determine which sump is the origin of the particles found.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 79-00-00-080-001-A	Removal of the Magnetic Bar from the Scavenge Screen Plugs (IF OPTIONALLY INSTALLED)
TASK 79-00-00-281-002-A	Check of the Electrical Master Chip Detector (EMCD) for Particles
TASK 79-00-00-281-003-A	Check of FWD Sump, AFT Sump, AGB and TGB Scavenge Screens
TASK 79-00-00-281-004-A	Preparation of the Particles from the Electrical Master Chip Detector (EMCD)
TASK 79-00-00-281-005-A	Analyze Particles
TASK 79-00-00-480-001-A	Installation of a Magnetic Bar in the Scavenge Screen Plugs (OPTIONAL)
Installation of the Magnetic Bars in the Scavenge Screens

3. Job Set-up
Subtask 79-00-00-941-080-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 79-00-00-010-085-A ** ON A/C NOT FOR ALL

B. Open the fan cowls doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

4. Procedure
Subtask 79-00-00-281-057-A ** ON A/C NOT FOR ALL

A. Installation of the Magnetic Bars

CAUTION: THE INSTALLATION OF THE MAGNETIC BARS MUST:

BE LIMITED TO ONE OF TWO ENGINES
STAY TEMPORARY. REVENUE SERVICE FLIGHTS WITH THE MAGNETIC BARS INSTALLED MUST BE LIMITED TO 5 CYCLES OR 25 HOURS AND THEN THE MAGNETIC BARS MUST BE REMOVED.

THE INSTALLATION OF THE MAGNETIC BARS IS ONLY AN HELP FOR TROUBLESHOOTING.

(1) If magnetic bars are available:
(a) Install the magnetic bars in the scavenge unit scavenge screen plugs (Ref. AMM TASK 79-00-00-480-001) and (Ref. AMM TASK 79-00-00-080-001).

Installation of the Magnetic Bars in the Scavenge Screens ** ON A/C NOT FOR ALL

NOTE: This is an optional tool dedicated for troubleshooting only.

(2) Operate the engine at a minimum of 70 percent N1 for 10 minutes.

CAUTION: CONTINUED ENGINE OPERATION WITH A BEARING SPALLING CAN CAUSE EXTENSIVE DAMAGE TO THE ENGINE.

(a) Stop the engine.

Check of the Electrical Master Chip Detector (EMCD) for Particles (Ref. AMM TASK 79-00-00-281-002)
Check of FWD Sump, AFT Sump, AGB, and TGB scavenge screens (Ref. AMM TASK 79-00-00-281-003)
Preparation of the Particles from the Electrical Master Chip Detector (EMCD) (Ref. AMM TASK 79-00-00-281-004)
Analyse Particles (Ref. AMM TASK 79-00-00-281-005).

(b) Continued operation with the magnetic bars installed is limited to 5-cycles or 25-hours.

5. Close-up
Subtask 79-00-00-410-073-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) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:38:59 UTC