reported Incorrect behaviour on YAW channel CAS function

[TZeer]

In the manual it says:

"When a control input is made, the FMC detects the flight control movement in the respective LVDT axis (or axes) and will command movement of the SAS sleeve within the applicable flight control servo-actuator(s). This provides a “power steering” response to remove the lag effect of mechanical inputs into the flight control servo-actuators. At lower longitudinal airspeeds, the amount of CAS input is proportionally increased to ensure the aircraft handling remains consistent with flight at higher airspeeds."

"CAS is disabled in the FMC Yaw channel when the aircraft is on the ground (determined by the weight-on-wheels or “squat” switch). This prevents oversteering during ground taxi."

This is not happening while on the ground.

If you put up the overlay for joystic and control behaviour, you can clearly see the CAS is working and adding YAW inputs when using the pedals while on the ground. This explains why so many feel the Apache is super twitchy while taxing on the ground. 

(That is if I understand the joystic overlay correct. I assume the green bar moving ahead of the white marker is what output the FMC is doing, and the white one is what the physical pedals/cyclic is doing?)

See attached track.

Best regards

AH64D_YAW.trk

Edited August 4, 2022 by TZeer

[Raptor9]

This has already been reported by the SME team. However, thank you for your attention.

[TZeer]

@Raptor9 thank you for quick reply.

Quick question. I have 2 other bugs I think. Should I make a post with them, or have they already been reported by the SME team?

1:
"Heading Hold sub-mode Page 207 in the manual

Heading Hold assists the pilot in maintaining the magnetic heading reference. If the force trim release switch is pressed, Heading Hold is disengaged, and the FMC Yaw channel will only provide command augmentation and rate damping. When the pilot stops pressing the force trim release switch, the FMC will update the Heading Hold reference to the current magnetic heading."

While pressing the force trim release, it seems the FMC does not give any command augmentation or dampening. The green indicator is glued to the white marker on the YAW channel.

 

2: While in Position Hold sub mode, moving the rudder pedals >3% does not disengage Heading Hold. Instead the FMC fights the pilot until you reach saturation before it starts turning. Easing up on the pedals again, turns the chopper back to it's original heading. 

 

Best regards

Edited August 4, 2022 by TZeer

[Raptor9]

@TZeer, you are correct on both counts. Both of these are also reported by the SME team, among other items of improvement as part of their flight model/FMC feedback.

Per my usual disclaimer, I can't speak for the dev team, nor do I have any time estimate on these improvements.