S-92 Collective coupling
 

It’s been 12 years since I flew the S-92, but yesterday I discovered, from talking to a current pilot, that the collective now decouples when 3-Cue and an engine fails. Does anyone know when this changed, and why?

i remember that on introduction with AMS.3.1 that it remained coupled but with no power limiting, so you could actually droop the Nr massively (in the sim….). Then AMS 3.2 fixed that and it would automatically set Vy when the failure occurred, and subsequently limited power to the OEI limit selected.

This seems like a strange retrograde step.

Legend says that the sim now reflects what the aircraft actually does, and was a surprise to all concerned at the time. Possibly corrected in AMS 11, whenever that arrives.

Yes, I have heard the FSI sim reacts like that, but the BHL one in ABN does not, so now the TRE has to fail the channel to replicate it

We had some discussion with Sikorsky back in 2017 following some in-flight engine shutdowns and the upshot at the time was that the FD will remain coupled in 3-cue if a throttle is moved to IDLE or if the FD sees a torque split between the two engines, but will switch to using the single-engine limits. However, the FD collective axis will decouple if a throttle is moved to STOP, and cannot be recoupled with a throttle in STOP. In OEI training mode, the FD remains coupled, because the mode does not communicate the simulated engine failure to the AFCS and the FD logic was not designed to support the 'OEI training mode'. When in a SAR mode, the FD will remain coupled

i haven't been involved for a few years now and things may have moved on...