During flight, I intentionally cut the engine off using the Idle Control lever. My question is: how do you restart? I tried using the ignition and starter(similar to the regular start-up) but keep getting a “chip detect” error and an electrical shorting out crackling sound. Then I can’t restart. I tried the following procedure from the Flight Manual with no luck. Any help would be appreciated!
IMMEDIATE RELIGHT (NG > 46%)
Power Lever RETARD to detent
Idle Control Lever LOW-IDLE
Aux Fuel Pump ON
Starter Switch ON
Ignition Switch ON
ITT/Ng/Np/Fuel Flow Indicators MONITOR
Oil Pressure Indicator MIN. 40 psi
When engine stabilized in LOW-IDLE:
Starter Switch OFF
Ignition Switch OFF
Idle Control Lever HIGH-IDLE
Power Lever AS REQUIRED
Land as soon as possible
NOTE
Immediate relight should only be carried out when height is critical for
normal relight. Use only during real emergency, do not practice during
training due to possible high ITT.
I just figured out that it gives the chip detect error and horrible sound if the bus tie breaker button is in. I’m not sure if this is true for a real porter as I’m no pilot. Any thoughts?
I was on a bush flight, landed, kept the engine running on idle, took off again and the engine blew about 50m off the deck so I deadsticked it. Temps seemed ok beforehand, but it showed Chip Detected.
Chip detect comes up as soon as you mishandle the engine (even if msfs default failures are off). Either by overtourqing or wrong engine start procedure.
Check the manual for the exact numbers, i dont remember them out of my head, but it should be the same inflight as at ground, id guess:
Fuel pump on, starter switch, wait for constant oil pressure (in the green), IGN ON, mixture low idle.
That’s basically what you describe up there, maybe a hot start needs a different procedure.
You could join the milviz discord and sure you will get the answer you are looking for.
I suspect I breached the engine limitations. It wasn’t engine start, as I explained in the OP.
I’d landed, kept the engine running, then took off again. I got to about tree height and the engine blew.
I’m guessing one or more of the engine limitations was breached.
If NG drops below 46%, immediately cut the fuel flow, below 46% there isn’t enough airflow through the engine to support combustion, it would create a wet start, hot start or hung start. You probably could perform a normal start by delaying fuel just fine. Getting chips in the engine oil is not realistic in such scenario, that would indicate wear in the reduction gearbox (usually the chip detector is placed at the bottom of the gearbox), in your case nothing happens with the gearbox whatsoever. I think the devs just programmed a generic “engine damage” scenario and applied it for exceedance of any engine limitations.
If you firewall the power lever and exceed redline torque there could be something breaking down inside the reduction gearbox, the engine should have some transient limitations for 20 minute, 5 minute, 20 sec, 5 sec and never exceed (depending on engine type). So slightly going over torque or ITT limit won’t immediately blow up the engine. Over torque might cause damage to the gear box and cause “chip detect”, over ITT will cause damage to the engine hot section but likely won’t cause damage to the gear box, so no “chip detect”. No idea what the crackling sound is supposed to represent, damage of the engine compressor section?
I flew for a company operating multi-engine turboprops, one aircraft had a chip detect light illuminating on one of the engines, I don’t know how many hours / sectors they continued flight without maintenance action but eventually the gearbox failed, probably one gear got worn and produced metal flakes, eventually a bigger piece came loose, fell in between other gears which broke into pieces causing a cascade through the gearbox, turning it into soup. It is usually something which happens over time though, even when exceeding engine limitations.
I had the same message. Turned out i was doing the startup sequence wrong. I was turning starter and ignition off AFTER setting the prop lever to full.
