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Continuous ignition – Continuous ignition may be selected by pressing the CONT ignition switch/light on the START/IGNITION panel. Both ignitions A and B are energized. When continuous ignition is selected, both green ON lights illuminate, and the IGNITION A/B advisory EICAS message appears.
Continuous ignition must be used during the following flight conditions:
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Takeoff and landings on contaminated runways;
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Takeoff with high crosswind components (greater than 10 knots);
.
Flight through moderate or heavier intensity rain;
.
Flight through moderate or heavier intensity turbulence; or
.
Flight in the vicinity of thunderstorms.
Autoignition (aerodynamic stall protection) – Automatic activation of continuous ignition is based upon angle-of-attack (AOA) data. Both systems A and B are energized by the stall warning computer, and remain on until the airplane flight attitude is corrected.
POWER PLANT Description Vol. 2 19.10.16
Oct 05/06
Activation of the Stall Protection System Test will activate continuous ignition.
Both ignition systems A and B are disabled on the associated engine when the L (R) ENGINE FIRE PUSH switch/light is selected. If continuous ignition was in use, the white ON legend of the CONT switch/light will extinguish, but the green ON lights in the switch/lights remain illuminated, and the IGNITION A/B advisory EICAS message remains displayed (to advise the crew that continuous ignition is still active on the unaffected engine).
Ignition System
Figure 19.10.10
VIBRATION MONITORING SYSTEM Description
The power plant consists of two major rotating assemblies, the N1 fan and N2 core sections. Each assembly is continuously monitored for vibration. Indications are displayed on the EICAS page.
POWER PLANT Description Vol. 2 19.10.17
Oct 05/06
Operation
N1 Fan
N1 fan vibration is displayed as a numeric readout on the EICAS page as FAN VIB. When the N1 vibration level is 2.7 mils or greater, the color of the readout changes to amber. There is no associated caution EICAS message.
N2 Core
N2 core vibration levels are continuously monitored, but are presented only when vibration levels exceed a target value. An amber VIB icon appears in the middle of the N2 gauge when the vibration target value is exceeded. There is no associated caution EICAS message.
Vibration Monitoring System Test
The system is tested by selecting the VIB switch on the ENGINE CONTROL panel to the TEST position. In the TEST position, high vibration levels are simulated in the electrical circuitry. The following indications appear on selection of the ENGINE VIB test switch:
.
FAN VIB readouts increase to 3.6 mils, changing from green to amber, passing through
2.7 mils; and
.
Amber VIB icons appear on the N2 dials.
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