R (2) Examine the EMCD plug for unwanted material presence. Check for
R unwanted material build-up within the gap between the 2 magnet poles.
(a) Normal contamination: R - A small quantity of small unwanted material or fuzz-like R particles is normal, mainly on low time engines, new engines or R after shop visit.
(Ref. Fig. 602/TASK 79-00-00-991-304)
- Slivers. R These particles come into view as hair like slivers. This R normally shows normal wear interference on air/oil seals on new R or rebuilt engines.
(Ref. Fig. 602/TASK 79-00-00-991-304)
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R Position of the Electrical Master Magnetic Chip Detector for Particles
Figure 601/TASK 79-00-00-991-301
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R Debris Presence on the Electrical Master Chip Detector for Particles (Normal
Contamination)
Figure 602/TASK 79-00-00-991-304
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- Machining Chips that are shiny and spiral curls that have parallel marks from machine tools when you see them with a magnifying lens, 5 to 10 times magnification, hand held. This unwanted material can be found on new engines.
1 No maintenance action is required.
_
2 Clean the EMCD.
_
NOTE : Even if you can not see unwanted or you can see small
____
R unwanted material, do a cleaning of the Chip Detector
R Magnetic using a clean cloth, lintless, process
R cleaning absorbent wiper (cheese cloth, gauze) with
R stoddard solvent (Material No. CP2011) or acetone
R (Material No. CP1039) or ardrox 552 (Material No.
R CP2559) or turco ind 79 (Material No. CP2560) or mag-
R chem teksol (Material No. CP2566) or degreasol 99 R
R (Material No. CP2584) or mag-chem skysol (Material No.
R CP2656) or white spirit (Material No. CP2010), thus to
R prevent repetitive pop outs of the Visual Indicator.
(b) Abnormal contamination:
- Flakes. These particles are like paper-thin chips, shiny, bright laminated particles (sometimes exhibiting overheating discoloration). These particles may indicate a bearing failure. (Ref. Fig. 603/TASK 79-00-00-991-305)
NOTE : If the engine has already suffered from a bearing failure
____ and the retrieved particles have been analyzed and identified as M50 or M50 NIL material showing an overheated aspect, they can be suspected as coming from the previous bearing failure (retention of the particles within the oil system sump in despite of the cleaning process done in the shop).
- Chunks. These are 3 dimensional particles that may indicate that a gear, bearing or a rotating seal (etc...) is defective. (Ref. Fig. 603/TASK 79-00-00-991-305)
- Any amount of non-identified particle(s) with a size larger than 0.02 in. (0.5 mm).
1 Carefully remove and keep the particles from the magnet.
_
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Figure 603/TASK 79-00-00-991-305
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2 If you identify bearing material or the particles that are
_ identified as flakes, thin, shiny, bright and laminated chips (this may be indicative of a bearing failure - M50 or M50 NIL material):
a Send the particles 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).
c If available, install the Magnetic Bars in the scavenge
_ unit scavenge screen plugs (Ref. TASK 79-00-00-480-001) and (Ref. TASK 79-00-00-080-001). (Ref. Fig. 604/TASK 79-00-00-991-306)
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 trouble
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