PPRuNe Forums - Careflight - Darwin AW139 Incident.

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212man

24th April 2020 12:38

Quote:

Originally Posted by Hot_LZ (Post 10760826)

The NR wouldn’t have drooped as the engines would just keep producing unless an TQ LIM was activated.

Regardless of the above you know when you’ve over torqued from a bad situation. Collective would be under your armpit and you’de see the ground coming at you! The maintenance message can be interrogated when you’re on the ground by crew or engineers. It’ll tell you in plain English that you over torqued!

LZ

Well max transient AEO Tq is 121% for 5 seconds. I've seen incidents with lower Tq with Nr droop

Turkeyslapper

24th April 2020 22:50

Quote:

Originally Posted by 212man (Post 10761596)

Well max transient AEO Tq is 121% for 5 seconds. I've seen incidents with lower Tq with Nr droop

OEI MCP 140% 2.5 minute limit 160% .....near sea level AEO more than capable of getting to 159% without any NR bleed. Certainly seen that achieved in other parts of the world too 😎

PPRuNeUser129638

25th April 2020 15:31

If 160% was pulled AEO, a red Inverted CAS message XSMN OVTQ should have displayed, then remained as red on black text in the CAS box. Hard to overlook.

Not sure Nr droop would be an issue, as each engine is still only supplying 80% of its rated power. This was an untidy go around AEO, not an OEI situation.

212man

25th April 2020 16:01

My Nr comments are based on having seen FDM footage of a botched AEO go-around that used much less power, plus other incidents on other types but, if it didn’t drool, fair enough.

PPRuNeUser129638

25th April 2020 16:11

Quote:

Originally Posted by 212man (Post 10762859)

My Nr comments are based on having seen FDM footage of a botched AEO go-around that used much less power, plus other incidents on other types but, if it didn’t drool, fair enough.

I have seen the opposite phenomena a few times, where most of the available power is used irrespective of weight, followed by an aggressive rotation in which the disk becomes offloaded briefly, accelerates and causes the EECs to chase the Nr. This can cause a transient overtorque. The cause may be a CAT Rambo profile..

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