B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 79-00-00-200-001 Operational Check of the Master Chip Detector Remote R indication AMM 79-00-00-281-002 Check of the Electrical Master Chip Detector for Particles R AMM 79-00-00-281-003 Check of FWD, AFT Sump, AGB, and TGB scavenge screens AMM 79-00-00-480-001 Installation of a Magnetic Bar in the Scavenge Screen
Plugs (OPTIONAL)
AMM 79-21-30-000-001 Removal of the Visual Indicator
AMM 79-21-30-400-001 Installation of the Visual Indicator
AMM 79-21-30-440-001 Resetting of the Visual Indicator
ASM 79-36/00
3. Fault Confirmation
__________________
A. Test.
(1) Not applicable.
NOTE : The visual indicator is popped out if a magnetic particule is
____ or has been captured by the Electrical Magnetic Chip Detector (EMCD).
NOTE : Nuisance detections can be experienced during early revenue
____ service operation (up to 1000 hours since engine new or since shop visit). Residual machining debris can be present in the engine oil system. Whenever a magnetic debris is dislodged (usually during early revenue service), it will be transported
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by the oil and captured by the Electrical Master Chip Detector. In this case, it's not abnormal that no contamination is found on the magnetic chip detector at the time of the inspection since an isolated particule may have been dislodged from the chip detector magnet between the time it was captured and the time of the inspection.
4. Fault Isolation
_______________
A. Do this procedure:
(1) If the Visual Indicator has popped out:
NOTE : In order to reduce burden for nuisance EMCD pop out
____ indication, the inspection of the Electrical Master Chip Detector can be defeered to the next convenient maintenance opportunity where trained personnel can performed the inspection without interfering with revenue service operation.
- Do a check of the Master Magnetic Chip Detector for particule (Ref. AMM TASK 79-00-00-281-002).
(a) If you find particule(s):
- do maintenance action as per procedure (Ref. AMM TASK 79-00-00-281-002) and per CFMI NDT Manual - Part 10 (chip analysis),
- do a check of the scavenge screens plugs for debris (Ref. AMM TASK 79-00-00-281-003). If you cannot isolate the engine sump, the contamination is coming from, you can install (if available - Optionnal Kit) the Magnetic Bars in the scavenge screen plugs (Ref. AMM TASK 79-00-00-480-001).
- reset the visual indicator (Ref. AMM TASK 79-21-30-440-001).
(b) If you find no particule:
- Even if no particule/debris is visible, do a cleaning of chip detector magnet using a clean cloth with stoddart solvant (Material No. CP2011) or white spirit (Material No. CP2010).
- Reset the visual indicator (Ref. AMM TASK 79-21-30-440-001).
- No further maintenance action is required.
(c) If the indicator pop out detections are repetitive and no particule is never found:
NOTE : Following maintenance is to be done only if pop out
____ indications are too repetitives and repeated cleaning on the chip detector were not successfull.
R - Inspect/ check the electrical magnetic chip detector system R (Ref. AMM TASK 79-00-00-200-001) R
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(2) If the EMCD circuit breaker 4EN has tripped Off in the cockpit on panel 121VU:
- Replace the visual indicator (Ref. AMM TASK 79-21-30-000-001) and (Ref. AMM TASK 79-21-30-400-001).
(a) If the circuit breaker trips again:
- replace the electronic master chip detector 4007EN
1_ if the circuit breaker trips again:
- check the electrical wiring between EMCD 4007EN and circuit
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