Embraer EMB145, Operation Manual

Page: 1918 / 2662

AIRPLANE
OPERATIONS
MANUAL
POWERPLANT
REVISION 41
2-10-50
Page
17
Code
01
Copyright © by Embraer. Refer to cover page for details.
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If a flameout is detected, the FADEC turns on the ignition
system, provided the ignition switch is in the AUTO position,
until the engine is restarted.
− During ground starts, the FADEC B7.5 and on monitors N2
speed start limit override. If the N2 speed exceeds 500 rpm, the
FADEC starts a timer and if a successful start is not declared
within 113 seconds (130 seconds for FADEC 9.4 and on), the
FADEC commands an engine shutdown.
NOTE: This is a backup protection only and does not preclude
crew to monitor N2 and timely comply with Abnormal
Engine Start procedure.
−
During ground starts, the FADEC B8.0 and on monitors
Interturbine Temperature (ITT) start limit override. If the
combination of temperature and time exceedance achieves the
reference value, the FADEC shuts the engine down. Therefore,
if the temperature exceedance is higher, the command to shut
the engine down will be shorter in time. The FADEC also
reduces the fuel flow to maintain or reduce ITT below the
maximum operating temperature limit.
NOTE: - This is a backup protection only and does not
preclude crew to monitor ITT and timely comply with
Abnormal Engine Start procedure.
- ITT may momentarily exceed the limit due to lags in
the system (ITT measurement, fuel flow metering
valve response time).
−
During ground starts, the FADEC B9.4 and on will command a
shutdown if no lightoff is detected after 30 seconds of fuel
introduction.
ENGINE DRY MOTORING
An Engine Dry Motoring must be performed for at least 30 seconds
after any aborted start to assure that no unburned fuel remains in the
combustion chamber and/or to reduce residual ITT prior to attempting
another start.
Ignition switch must be rotated to OFF position in order to disable
ignition and fuel flow prior to rotating the Stop/Run/Start switch to the
start position.