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1. (WO2016055738) METHOD AND DEVICE FOR NOTIFYING AN AUTHORIZATION TO COMPLETELY SHUT DOWN AN AIRCRAFT GAS TURBINE ENGINE

Pub. No.:    WO/2016/055738    International Application No.:    PCT/FR2015/052703
Publication Date: Fri Apr 15 01:59:59 CEST 2016 International Filing Date: Fri Oct 09 01:59:59 CEST 2015
IPC: F01D 21/00
F02C 9/00
Applicants: SAFRAN HELICOPTER ENGINES
Inventors: DESCUBES, Olivier, Pierre
PY, Jean-Michel, Pierre, Claude
Title: METHOD AND DEVICE FOR NOTIFYING AN AUTHORIZATION TO COMPLETELY SHUT DOWN AN AIRCRAFT GAS TURBINE ENGINE
Abstract:
Method for notifying an authorization to completely shut down an aircraft gas turbine engine and aircraft gas turbine engine comprising a device for such notification, the method comprising, following the detection (E10) that the engine has switched to low idle: • (a) a step (E20) of evaluating, from a value of a first engine operating parameter, a value of a second parameter T45MG characterizing a thermal behaviour of an engine component subject to coking; • (b) a step (E30) of comparing the value of the second parameter T45MG against a predefined threshold value T45threshold corresponding to a value of the second parameter that does not cause coking of said component; and • (c) a step (E50) of notifying authorization to completely shut down the engine if the value of the second parameter T45MG is below the predefined threshold value T45threshold, steps (a) to (c) being reiterated if not.