d Operate the engine at a minimum of 70 percent N1 for 10
_
minutes.
e Inspect the Electrical Master Chip Detector (EMCD) for
_ particles and the magnetic bars in the scavenge screen plugs (if installed):
CAUTION : THE INSTALLATION OF THE MAGNETIC BARS IS ONLY AN
_______ HELP FOR TROUBLESHOOTING. REVENUE SERVICE FLIGHTS WITH THE MAGNETIC BARS INSTALLED MUST BE LIMITED TO 5 FLIGHTS OR 25 HOURS AND THEN THE MAGNETIC BARS MUST BE REMOVED.
- IT IS TEMPORARY STEP FOR TROUBLESHOOTING AND MUST BE LIMITED TO ONE OF TWO ENGINES.
CAUTION : CONTINUED ENGINE OPERATION WITH A BEARING
_______ SPALLING CAN CAUSE EXTENSIVE DAMAGE TO THE ENGINE.
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R Installation of the Magnetic Bars in the Scavenge Screens Figure 604/TASK 79-00-00-991-306
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- If no particle is found, inspect the Electrical Master Chip Detector (EMCD) and the Magnetic bars in the scavenge screen (if installed) after each flight until you get the analysis from the Laboratory.
- If particle (bearing material) is found:
- If the Magnetic Bars in the scavenge screen are not
installed:
. replace the engine (Ref. TASK 71-00-00-000-042) and
(Ref. TASK 71-00-00-400-042).
- If the Magnetic Bars in the scavenge screen are
installed:
. If you identify bearing material on the AGB Magnetic
Plug, replace the AGB (Ref. TASK 72-63-00-000-003) and
(Ref. TASK 72-63-00-400-003).
. If you identify bearing material on the TGB Magnetic
Plug, replace the TGB (Ref. TASK 72-62-00-000-002) and
(Ref. TASK 72-62-00-400-002).
. If you identify bearing material on the FWD or AFT Sump
Magnetic Plug, replace the engine (Ref. TASK 71-00-00-000-042) and (Ref. TASK 71-00-00-400-042).
3 If you identify black tab (15CDV6 material) from oil
_
distributor of AGB:
a Replace the AGB.
_
b An 10 cycles maximum extension is authorized before
_
replacement of the AGB.
4 If particles identified as chunk(s), or any amount of
_ non-identified particles larger than 0.02 in. (0.5 mm):
a send the particle(s) to a Laboratory for analysis.
_
b do a check of the lubrication unit scavenge screen plugs
_ for unwanted material (Ref. TASK 79-00-00-281-003).
CAUTION : THE INSTALLATION OF THE MAGNETIC BARS IS ONLY AN
_______ HELP FOR TROUBLESHOOTING. REVENUE SERVICE FLIGHTS WITH THE MAGNETIC BARS INSTALLED MUST BE LIMITED TO 5 FLIGHTS OR 25 HOURS AND THEN THE MAGNETIC BARS MUST BE REMOVED.
- IT IS TEMPORARY STEP FOR TROUBLESHOOTING AND MUST BE LIMITED TO ONE OF TWO ENGINES.
NOTE : This is an optional tool dedicated for
____ troubleshooting only.
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- If no particle is found in any scavenge screen, you may want to consider the installation of a Magnetic Bar in the scavenge screen plugs (Ref. TASK 79-00-00-480-001) and (Ref. TASK 79-00-00-080-001).
- Operate the engine at a minimum of 70 percent N1 for 10 minutes.
- Do a check of the Electrical Master Chip Detector (EMCD) for particles and the Magnetic bars in the scavenge screens (if installed).
- Do a check of the EMCD for particle(s) after each flight until you get the analysis from the laboratory, limit engine operation to 5 cycles or 25 hours.
- After you get the analysis from the laboratory, then do the applicable corrective action for the type of material that you found.
- If the engine condition becomes worse before you have feedback from the laboratory, refer this information to CFM_International (your CFMI Representative or CSC).
NOTE : For reference, some specific examples of known
____ particles recovered from CFM56 engine oil systems are given in the following documentation:
- NTM (Non Destructive Test Manual) - Chip analysis,
- PRINT SET, BOOK - PHOTOGRAPH MCD DEBRIS (856A1364)
- Part 10 - Book - Photograph of MCD Debris for reference.
(3) Clean the Electrical Master Chip Detector.
(a) Clean the EMCD.
NOTE : Even if you can not see unwanted material or you can see
____
small unwanted material on the magnet and in the gap R between the 2 poles, do a cleaning of the Chip Detector R magnet using a clean cloth with stoddard solvent (Material R No. CP2011) or acetone (Material No. CP1039) or ardrox 552 R (Material No. CP2559) or turco ind 79 (Material No. R CP2560) or mag-chem teksol (Material No. CP2566) or R degreasol 99 R (Material No. CP2584) or mag-chem skysol R (Material No. CP2656) or white spirit (Material No. R CP2010), thus to prevent repetitive pop outs of the Visual
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