RR TRENT 900 OIL SYSTEM

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In RR Trent 900 Oil System, who monitors the main oil parameters?

FADEC and EIPM

what computer transmits oil parameters to SD and FWS?

EEC

In RR Trent 900 Oil System, Feed oil is circulated by?

Single Pressure Pump

Acts as a by-pass for cold starting and system blockage protection in Oil pump unit

Pressure Relief Valve

In Trent 900 Oil System, what cleans the feed oil?

Pressure Filter

Monitors Pressure Filter condition and provides a cockpit indication that the filter is becoming clogged.

Differential Pressure Transducer

A differential pressure transducer monitors the pressure filter condition and provides a cockpit indication that the filter is becoming clogged, this switch is set to operate at a differential pressure of?

23 psid

What are the two functions of Fuel-Oil-Heat-Exchanger (FOHE)?

To decrease the temperature of the oil, To increase the temperature of the fuel

What protects the cooler core of FOHE when the engine oil is very cold or if the core is blocked?

oil pressure relief valve

What prevents oil suction from the FOHE during engine shut down?

An anti-siphon tube

In Trent 900 Oil System, how many scavenge pump element are installed?

nine

In RR Trent 900, How many positions for installing magnetic chip detectors (MCDs) are there?

nine

The oil outlets from the scavenge pumps join to form a combined scavenge return flow which is sampled by?

one Electric Master MCD

Filters scavenged oil before returning back to oil tank.

Scavenge Oil Filter

The 15- micron fine scavenge filter has a by-pass valve which allows oil to bypass Scavenge Filter at what differential pressure?

20 psid

The 15- micron fine scavenge filter ha a pressure differential transducer which give cockpit indication of impending filter clogging at what differential pressure?

13 psid

Cockpit indication of scavenge line oil temperature are from Temperature Sensors located at?

Temperature sensors in the return line between the scavenge pumps and scavenge filter

On RR Trent 900 Oil System, what prevents oil loss from the bearing chambers?

Labyrinth oil seals and the sealing airflows from the engine compressors

On RR Trent 900, all scavenge oil is de-aerated when it enters the oil tank by a?

cyclone type separator

What is used to clean and cool the oil tank sight glass?

Anti-siphon line carries a small flow of oil from the main feed line back to the oil tank.

What component separates air and oil before discarding the air to atmosphere?

The centrifugal breather

What happen to the oil after it separates from air in the centrifugal breather?

the oil is scavenged from the breather housing back into the combined scavenge line back to the oil tank.

The oil spilled during servicing is collected in the?

oil tank filler scupper

A potentiometer style device with changes in resistance indicating different oil levels. It is consisting of a series of reed switches and resistors that form a ladder activated by a float containing a permanent magnet. Measures the quantity of engine oil in the oil tank to provide a cockpit indication.

Oil Quantity Transmitter

The output voltage from oil quantity transmitter is measured by?

EEC Channel B

The needle and the digital indication are normally green. The digital indication pulses if the oil quantity drops below?

4 quartz

In RR Trent 900 Oil System, what type of oil pump assembly that consists of a pressure pump and nine scavenge pumps to scavenge oil from the various areas of the engine back to the oil tank?

Vane type

The pressure pump has a pressure relief valve, this protects the system for cold starting and blockage protection and is set to what pressure?

600 psi

A non-bypass type filter installed inside the filter housing and can be accessed by removing the filter cover?

Pressure Filter

The Pressure Filter is a 125-micron cleanable type filter and has a life of?

3 cleans

What prevents the loss of oil when the pressure filter is changed?

A check valve in the filter housing

What prevents oil draining back to the pressure pump when the engine is shut down?

An Anti- leak valve in the filter housing

Where does the oil pressure pump and pressure filter assembly are installed?

On the rear face of the external gearbox between the centrifugal breather and the lower bevel gearbox.

Where does the Electric Master MCD is positioned?

At the inlet to the scavenge filter and collects ferrous metal particles from the engine oil.

The Engine Monitoring Unit (EMU) continuously monitors the EMCD during flight. When does EMU generates an EMCD debris maintenance message?

10 secs after landing which is sent to the Aircraft via the EEC.

What prevents oil leakage when the MCD is removed for inspection?

self-closing check valve

Non-cleanable, by-pass type filter. If the filter element becomes clogged, the by-pass valve opens and allows the oil to flow directly back to the tank.

Scavenge Filter

The scavenge filter differential pressure switch monitors the pressure at the inlet & outlet of the filter and provides an indication when the filter becomes partially clogged. The switch is set at 13 psid. When oil temperature becomes low, what computer will inhibit the filter clog message?

EEC

Purpose of Centrifugal Breather?

To remove the oil from the vent air, before discarding the air overboard.

Where does the Centrifugal Breather installed?

Installed in the external gearbox and located on the rear face between the oil pump and the fuel pump.

What drives the Centrifugal Breather?

External Gearbox

Where does the Fuel-Oil-Heat-Exchanger located at RR Trent 900 Engine?

The FOHE is mounted horizontally below the oil tank on the right side of the fan case.

In RR Trent 900 Oil System, the oil pressure transducer assembly which consists of two transducers supplied by the same oil pressures. The oil pressure transducers assembly measures the differential oil pressure between?

The output of the oil pump and the internal gearbox chamber scavenge line.

The needle and the digital indication of oil pressure are normally green. The needle and the digital indication will turn red if the oil pressure drops below?

25 psi

Purpose of Low Oil Pressure Switch in the Oil system?

The low oil pressure switch measures the same differential oil pressure as the oil pressure transducers to provide an indication when the oil pressure drops to a pre-set level.

What are the two oil pressure warning conditions? Oil pressure less than an N3 related value (Amber) Oil pressure less than the minimum threshold (Red)

Oil pressure less than an N3 related value (Amber) Oil pressure less than the minimum threshold (Red)

When the oil pressure falls below the amber value but remains above the low-pressure switch limit, what will be the cockpit display?

amber and a maintenance message will be set.

When the engine is running and 2 out of 3 inputs oil pressure value are below threshold, what will be the cockpit display?

Red alert is set, and cockpit enunciates the low oil pressure condition.

What will be the cockpit display if there is a pending blockage of either the pressure filter or scavenge filter?

On EWD: ‘OIL FILTER CLOG’ message Aural Warning Master Caution

On SD: Amber ‘CLOG’ message

In the event of a failure of one of the sensors, the EEC shall select the remaining valid sensor. When there is a disagreement between the two measurements, what will the EEC do?

EEC selects the higher value for cockpit display

The oil temperature displays in degrees C on the ECAM SD screen and is normally green. The indication turns Amber if?

the temperature exceeds a fixed temperature or for a short-term spike.

The pressure pump has a pressure relief valve, this protects the system for cold starting and blockage protection and is set to what pressure?

600 psi

In RR Trent 900, if the engine has been stopped for less than 6 hours and the oil level is low, what you should do?

Fill the engine oil tank.

In RR Trent 900, if the engine has been stopped for more than 6 hours and the oil level is low, but not below 4.73 liters (5 US quarts) from the required level, what you should do?

Do not fill the engine oil tank.

When installing the housing of oil pressure filter, what precaution must be done?

You must only tighten the filter housing with your hand only. If you use tools you can cause damage to the screw threads.

You must only tighten the filter housing with your hand only. If you use tools, you can cause damage to the screw threads.

Test your knowledge about the oil system of RR Trent 900 engine, including monitoring parameters, oil circulation, and maintenance procedures.

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