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engines to increase N1 speed. Only the normally operating engine can respond, which it does by
increasing the N1 fan speed by a minimum of 2%. This increase in rpm equates to an increase of
approximately 500 pounds of thrust. No roll-back in N1 rpm occurs when APR thrust has been
commanded and the APR system times-out.
When the APR system is activated, a green APR icon appears in the center of the N1 gauge of the
operating engine.
APR Test
The APR TEST switches allow the system to be tested on the ground. The system can only be
tested successfully with the engines operating. Normal system test operation results in the APR
TEST 1 (2) (3) OK advisory EICAS message. If the system fails, an APR INOP caution EICAS
message is displayed.
ENGINE CONTROL Panel
Figure 19−10−4
ENGINE OIL SYSTEM
Description
Oil from each engine nacelle tank is circulated under pressure to lubricate the engine and
accessory gearbox.
Components and Operation
The gearbox-driven main lubrication pump pressurizes the lubrication system. Oil flows from the
pump through an oil filter, a fuel/oil heat exchanger, and continues through the engine sumps to
the bearings and gearbox.
POWER PLANT
Description
Vol. 2 19−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE OIL SYSTEM (CONT'D)
The oil is returned to the oil tank by the gearbox-driven main lubrication and scavenge pumps. The
oil passes through scavenge screens for filtering prior to the oil pumps. The oil then flows through
a chip detector and a deaerator to the tank. Maximum oil consumption is 6.4 ounces or 0.05 US
gallons/hour.
Engine oil pressure and temperature indications are presented on the EICAS primary page. To
provide system redundancy, a pressure switch and separate pressure transmitter are used to
monitor the engine oil pressure. When low oil pressure is detected by the pressure switch, the L(R)
ENG OIL PRESS warning EICAS message is presented. If the pressure transmitter detects low oil
pressure, the EICAS digital oil pressure readout changes to red.
Chip detector and impending oil filter bypass indications are provided in the aft equipment bay on
Junction Box 5 (JB-5) but are not presented on EICAS.
Pressurized refilling of the engine oil tanks is provided by a replenishment tank system located in
the aft equipment bay. The system remotely gauges engine oil tank level and is used to transfer oil
to the engine-mounted tanks.
POWER PLANT
Description
Vol. 2 19−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE OIL SYSTEM (CONT'D)
Oil System Schematic
Figure 19−10−5
POWER PLANT
Description
Vol. 2 19−10−8
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE OIL SYSTEM (CONT'D)
Engine Oil Replenishment System
The Challenger 604 is equipped with an oil replenishment system located in the aft equipment
bay. The system consists of a replenishment tank holding approximately 6.0 U.S. quarts of oil, a
pump, selector valve, and control panel.
If a low oil tank quantity is indicated during the test, the nacelle oil tanks can be filled from the
replenishment tank. Pump and selector valves, located next to the replenishment tank, are used
to transfer oil from the replenishment tank to the applicable engine-mounted tank.
Engine Oil Replenishment Procedure
Oil levels should be checked between 15 minutes to two hours after engine shutdown. The
engines must be motored if the replenishment period is exceeded. Maximum refill allowable is
2 U.S. quarts, then the engine must be dry-motored for at least 30 seconds prior to adding
more oil.
Oil replenishment is accomplished as follows:
1. Note the oil quantity on the oil replenishment tank gauge.
2. The system power switch is selected ON, illuminating the green ON light.
3. The ENG OIL PRESS TO TEST switch/light is activated to illuminate (test) the green
LH (RH)-FULL indications.
4. The selector valve is rotated to the L or R position as required to pump oil from the oil
replenishment tank is the associated engine oil tank.
5. The selector valve is released when the pump automatically shuts off and the
LH (RH)-FULL legend illuminates. A full level is indicated by the illumination of the
respective side green light (LH FULL or RH FULL).
6. The system power switch is selected OFF.
7. Oil quantity used for each engine is noted.
POWER PLANT
Description
Vol. 2 19−10−9
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENGINE OIL SYSTEM (CONT'D)
　
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