Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-121
26-Jul-2017
Each engine has two AC ignition systems (A & B). Each system is comprised of two ignition exciters and two
igniter plugs. Either system is supplied by a different electrical bus (sys A by the AC essential bus and sys B by
the battery bus through a static inverter).
The ignition systems are normally controlled by the FADEC but may be activated manually by pressing the
CONT button. The CONT button activates both systems simultaneously whereas the FADEC normally alternates
between systems.
In case the FADEC senses a failed ignitor, it will automatically switch the system after a 15 second delay and
display a L/R IGN A or B fault message. In the event of an engine fire, pressing the FIE PUSH switch on the glare
shield makes the FADEC disable the ignition systems on the affected engine.
OIL SYSTEM
Each engine has a lubrication system which is independent of the other engine’s lubrication system.
The reservoir has a capacity of 7,2 quarts (6,8 liters) oil. Given the maximum allowable oil consumption of 0,05
US gallons per hour (189 ml/hr) the oil capacity allows 36 hours of operation. To monitor the lubrication
systems health, two parameters are indicated on the EICAS:
• Oil temperature
• Oil pressure
During engine start, the oil pressure indications on the EICAS page are displayed with an analogue gauge and a
digital readout. After start-up and all parameters stabilized in normal bands the indication reverts to N1
vibration gauges. The digital oil pressure indication remains.