Originally Posted by
tdracer
What exactly do you mean by "fail to stabilize at idle"? Doesn't reach idle, keeps accelerating past idle, rpm starts oscillating around idle speed?
There are a number of ways a start can go wrong - hung start (stops accelerating short of idle), hot start (exceeds start EGT), etc.
In most cases, autostart will take corrective action (assuming the engine is so equipped), if not the normal procedure is to cut fuel, dry motor for a period (typically 30 seconds), then try again (although there are some engine specific techniques that can come into play).
There have been cases where a crew started an engine with the throttle well forward of idle - which caused the engine to keep accelerating above idle. The obvious corrective action is to retard the throttle to idle.
So basically I'm just putting together some notes for KDRs from my ATPL AASA exam. One of the things it is asking about is the cause/remedy of certain start-up malfunctions: hot start, hung start, failure to light off, starter fails to disengage and, lastly, fails to stabilise at idle. I got all of them covered but the "fails to stabilise at idle". Perhaps the reason I can't find any info on it is because it is so vague.