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CHAPTER 79 - ENGINE OIL

SECTION 79-30 - INDICATING

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SECTION 79-30

INDICATING

DESCRIPTION

The components concerning the engine oil lubricatingsystem are the following:

1 chip detector

1 oil pressure transducer

1 oil temperature transducer and low pressure switch.

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OPERATION

If enough ferrous metallic particles are collected to bridgethe gap between the magnets of the chip plug, a groundsignal is provided to the MAUs that generate the cautionalarm displayed on the MFD.The oil pressure transducer is a strain-gauge type, thatprovides an analog input to MAU N. 1 (engine 1) and toMAU N. 2 (engine 2) for the MFD representation.

The oil temperature transducer is a platinum resistancetemperature probe that provides an analog input to MAUN. 1 (engine 1) and to MAU N. 2 (engine 2) for the MFDrepresentation.If the oil temperature rises above a predetermined value,the MAU N. 1 for engine 1 and the MAU N. 2 for engine 2generates a caution alarm displayed on the MFD.The low pressure switch is embedded with the oil temper-

ature transducer.If the oil pressure drops below a predetermined value, theMAU N. 1 for engine 1 and the MAU N. 2 for engine 2generate a warning alarm displayed on the MFD.

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CONTROLS AND INDICATIONS

The engine chip detector test control is housed on theTest Control Panel located on the console.The engine oil pressure indicator is represented on onesingle vertical scale with one analog pointer and one digi-tal readout per engine.The engine oil temperature indicator is represented onone single vertical scale with one analog pointer and one

digital readout per engine.The two scales are displayed on the MFD (Main andCruise pages).The MFD also provides the malfunction condition in theCAS message window #1.

The Test Control Panel provides the following functions:

ENG 1 (2) CHIP DETECTOR pushbutton test switch :

when pressed the engine 1 (2) chip detector test isprovided: the caution 1 (2) ENG CHIP appears ininverse video.

NOTE If the above pushbutton test switches are pressedtogether, the caution displayed is 1-2 ENG CHIPin inverse video.

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CAPTIONS

The warning provided in the CAS is as follows:

1 (2) ENG OIL PRESS :

when the engine 1 (2) oil pressure in the lubricatingsystem is below 4.2 bar; resets above 4.7 bar.

NOTE When one of this warning is detected, besides theMWL activation, the AWG shall proved the follow-

ing:

no tone + WARNING WARNING (aural mes-sage).

This sequence is transmitted once only. This mes-sage has priority number 5.

The caution provided in the CAS is as follows:

1 (2) ENG OIL TEMP :

when the engine 1 (2) oil temperature in the lubricat-ing system is above 140C; resets below 137C.

1 (2) ENG CHIP :

when inside the engine 1 (2) oil lubricating system a

chip is detected.

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ENGINE OIL INDICATING COMPONENT LOCATION

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ENGINE OIL INDICATING SYSTEM CONTROLS

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ENGINE OIL INDICATING

NOTE When the loss of an analog input signal or an out of rangeinput condition is detected, the associated pointer isremoved from the display and amber dashes replace thenumerical readouts.

NOTE When a parameter being monitored exceeds the normal

range of operation (green band), the color of associatedpointer matches the color of applicable range marking (i.e.

amber or red), in order to highlight that particular criticalcondition.

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ENGINE OIL INDICATING OPERATING LIMITS (SHEET 1 OF 2)

REF. FUNCTION RANGEDIGITAL READOUT

COLOR MARKINGS

ANALOG SCALE

COLOR MARKINGSNOTE

1 ENG 1 OIL PRESSURE digital readout 0 to 19.0 bar see Note 1

2 ENG 2 OIL PRESSURE digital readout 0 to 19 bar see Note 1

3 ENG 1 OIL TEMPERATURE digital readout 50 to 180C see Note 1

4 ENG 2 OIL TEMPERATURE digital readout 50 to 180C see Note 1

6 ENGINE OIL TEMPERATURE analog scale 146 to 160C Red band

150C see Note 2 Red triangle

146C Red line

141 to 145C Amber band

10 to 140C Green band

50 to 9C Amber band

9 ENGINE OIL PRESSURE analog scale 10.1 to 19.0 bar Red band

15.2 bar Red dot Start transient

limit. See Note3

10.1 bar Red line

9.0 to 10.0 bar Amber band

6.3 to 8.9 bar Green band

4.2 to 6.2 bar Amber band

4.1 Red line

0.0 to 4.1 bar Red band

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ENGINE OIL INDICATING OPERATING LIMITS (SHEET 2 OF 2)

NOTE 1: In normal condition the background is black and the numerals green; the digital readout features aninverse video technique when an exceedance occurs.When the parameter is in amber or red band, the digital display background turns amber or red respec-tively and the numerals are black or white respectively.

NOTE 2: To be displayed only if ENG. OIL TEMP>140C.

NOTE 3: Engine 1 (2) Red Transient limit is displayed in starting phase only.

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SCHEMATIC

TBD

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