Pilot's Operating Handbook
Section 7
Description
Edition 0 - March 05, 2019
Rev. 3
Page 7.7.2
AT engine protections
AT en
gine protections automatically reduce engine power, to ensure that all engine
parameters never remain above the following cautionary threshold values :
- TRQ > 100 %
- Ng > 103.0 % ( NG HI CAS message)
- ITT > 820°C ( ITT HI CAS message)
● NOTE ●
When the AT is engaged in a mode that sets and maintains 100 % TRQ
(e.g. TO , CLIMB or any other mode that requires 100 % TRQ to reach and
maintain a specific airspeed or flight schedule), TRQ may temporarily exceed
100 % (TRQ indications become amber). It is normal for the autothrottle system
to take a few seconds to fully correct a torque exceedance. This may occur in
acceleration phases or during extention or retraction of the inertial separator.
The engine will only require inspection/maintenance if 110 % torque is
exceeded.
●
AT airspeed protections
AT airspeed protections are complementary to ESP, and operate as follows :
- AT automatically increases engine power to prevent any aircraft underspeed
condition.
- AT automatically reduces engine power to prevent any aircraft overspeed
condition.
>> Before GDU v21.45 GARMIN software (Pre-MOD70-0649-00E)
● NOTE ●
Airspeed thresholds taken into account by AT airspeed protections depend on
the current flap setting.
●
>> After GDU v21.45 GARMIN software (Post-MOD70-0649-00E)
● NOTE ●
Airspeed thresholds taken into account by AT airspeed protections depend on
the current flap setting and landing gear position.
●
>> All
For more information on AT protections, refer to GARMIN Pilot’s Guide, Autothrottle
and Electronic Stability & Protection (ESP) sections.
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