- instructions appear on the upper display unit
- the audio warning (single chime) sounds.
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Oil Differential Pressure Switch - Location
Figure 001
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R Oil Differential Pressure Warning Figure 002
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Oil Filter Clogging Indication
Figure 003
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Oil Filter Clogging Indication
Figure 003A
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E E Aug 01/05 E E ECES E 3. Engine-mounted visual indication system, associated with the master magnetic
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___________________________________________________________________________ chip detector (MCD) (Ref. Fig. 004, 005, 006)
A. General The oil (scavenge) system is equipped with a fan inlet case-installed visual indication system which serves to directly see and check if the oil system is contamined by magnetic particles/chips, or not. A pop-out type visual indicator, installed just above the oil tank, permits this visual check, each time the nacelle access door to the oil tank is opened during normal line maintenance (oil tank servicing for example) (Ref. Fig. 004)
B. Description (Ref. Fig. 004, 007, 008, 009) From front to rear, the visual indication system consists of the items which follow:
- the hand-removable probe of the master magnetic chip detector (MCD)
- a two-wire, shielded electrical cable (DPM cable)
- a pop-out type visual indicator In this system, the electronic circuitry of the visual indicator is supplied by a dedicated (28 VDC; 1.1 Amp. max.) aircraft line, but the visual indication is local, without redundancy in the cockpit. Besides, the only purpose of the two-wire cable (DPM) is to link (electrically) the MCD hand-removable probe and the pop-out type visual indicator.
C. Operation (Ref. Fig. 008, 009) The on-engine-installed magnetic particles contamination indicating system is electrically and electronically designed so that the 28 VDC detecting loop made of:
- the 2 magnets of the MCD hand-removable probe
- the two-wire DPM cable
- the electronics circuitry of the visual indicator is OPEN as long as the gap between the 2 magnets is not bridged by magnetic particles. In this condition, or state, the (red) pop-out indicator remains sunk under and inside its transparent cap and is thus NOT VISIBLE (see state 1) (Ref. Fig. 009) If a magnetic particle contamination occurs in the engine oil system, the gap between the 2 magnets is bridged by the particles and becomes conductive; this closes the 28 VDC loop and energizes (0.5 second only) the electronics of the visual indicator, which in turn energizes (see state 2)
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Location of the Lubrication Unit, Main Oil/Fuel Heat Exchanger and Master
Magnetic Chip Detector
Figure 004
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Master Magnetic Chip Detector (MCD) Figure 005
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Master Magnetic Chip Detector Hand-Removable Probe Figure 006
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Location of Pop-out Visual Indicator and DPM Cable on the Fan Inlet Case
Figure 007
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Main Items of the Visual Indicator and Wiring Diagram Figure 008
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Pop-out Type Visual Indicator - Operating Principle
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