OnCourse Software

Welcome to our Product Support Forums

Weird airspeed loss causes gear and flaps down

Post Reply   Page 1 of 2  [ 15 posts ]
Jump to page 1 2 »
Author Message
mllgrennman
Post subject: Weird airspeed loss causes gear and flaps down
Posted: Sat Apr 15, 2017 3:25 am
Offline
 
Posts: 390
Joined: Mon Feb 16, 2015 6:28 pm
 
During cruise the ASI will go to 0 for a moment...(this is with CS 757)...I'm working on this issue with CS and Active Sky...


But...should the gear and flaps not come down above 12,000ft even with low speed?


Top
Profile Quote
Dave March
Post subject: Re: RE: Weird airspeed loss causes gear and flaps down
Posted: Sat Apr 15, 2017 7:18 am
Site Admin
Offline
 
Posts: 6095
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
Contact: Website
 
mllgrennman wrote:
During cruise the ASI will go to 0 for a moment...(this is with CS 757)...I'm working on this issue with CS and Active Sky...


But...should the gear and flaps not come down above 12,000ft even with low speed?
I'd like to see a black box log

Sent from my phone using Tapatalk

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

[ img ]


Top
Profile Quote
Dave Leesley
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Sun Apr 16, 2017 9:07 pm
Offline
 
Posts: 1325
Joined: Fri May 22, 2009 8:27 pm
Location: Yorkshire
 
I have had this on some very odd occasions, like once in a blue moon... I put this down to the weather engine or the aircraft in question.

_________________

Regards Dave
Forum Moderator

[ img ]
[ img ]


Top
Profile Quote
johnhinson
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Sun Apr 16, 2017 11:19 pm
Offline
 
Posts: 256
Joined: Fri Dec 03, 2010 2:54 pm
 
Well, I am watching this thread carefully as I experience it about once per flight (about 90 minutes in) and it doesn't matter which aircraft. For me it could be REX weather, PF3 or FDC which are all running alongside FS2004.

I don't have FDC actually controlling flaps and gear but I am immediately aware of this happening by hearing the calls for them. I have now learnt not to panic as normally that would indicate the aircraft is about to stall.

I'm comforted I am not alone experincing this but haven't yet done any serious research into identifying the culprit. Unless it is a combination that is causing it I'm inclined to discount FDC as I have used that for years without issue. The other two are fairly recent additions.

John

_________________

My co-pilot is called Sid and he's a real Star!


Top
Profile Quote
johnhinson
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Mon Apr 17, 2017 5:35 am
Offline
 
Posts: 256
Joined: Fri Dec 03, 2010 2:54 pm
 
In case of use (in eliminating FDC if nothing else) here are the logs for my last flight.

If you want my PF3 logs, I can provide.

John

Attachments
fdc160417.zip
(13.64 KiB) Downloaded 430 times

_________________

My co-pilot is called Sid and he's a real Star!


Top
Profile Quote
Dave March
Post subject: Re: RE: Re: Weird airspeed loss causes gear and flaps down
Posted: Mon Apr 17, 2017 7:53 am
Site Admin
Offline
 
Posts: 6095
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
Contact: Website
 
johnhinson wrote:
In case of use (in eliminating FDC if nothing else) here are the logs for my last flight.

If you want my PF3 logs, I can provide.

John
Thanks for the logs, I'll take a look later

Sent from my phone using Tapatalk

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

[ img ]


Top
Profile Quote
Dave March
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Mon Apr 17, 2017 10:55 am
Site Admin
Offline
 
Posts: 6095
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
Contact: Website
 
Well FDC detected your airspeed had dropped dramatically to 56 knots !!!
Gear Down Called at 56 knts  13320'  7830' (RA)

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

[ img ]


Top
Profile Quote
johnhinson
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Mon Apr 17, 2017 11:26 am
Offline
 
Posts: 256
Joined: Fri Dec 03, 2010 2:54 pm
 
Quite.

That's because the ASI drops to zero, and after about thirty seconds returns to normal.

I can't really see that being caused by FDC. Nor by PF3.

Thanks for looking at it.

John

_________________

My co-pilot is called Sid and he's a real Star!


Top
Profile Quote
ThomasAH
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Mon Apr 17, 2017 12:30 pm
Offline
 
Posts: 988
Joined: Tue Dec 24, 2013 12:27 pm
 
johnhinson wrote: *  Mon Apr 17, 2017 11:26 am
That's because the ASI drops to zero, and after about thirty seconds returns to normal.
Pitot heat is on? (assuming your aircraft has this)
And if failures are modeled on the aircraft you're using: Actually working?

Edit: Ah, a 757. Here pitot heat should enable automatically, but check the annunciator panel if any of the four pitot heat lights show a failure.

_________________

[ img ]


Top
Profile Quote
johnhinson
Post subject: Re: Weird airspeed loss causes gear and flaps down
Posted: Mon Apr 17, 2017 4:02 pm
Offline
 
Posts: 256
Joined: Fri Dec 03, 2010 2:54 pm
 
Ah, don't mix me up with the OP. Sorry, I wasn't meaning to hijack.

In my instance yes, pitot heat is on. If pitot heat was off the ASI would not improve until you switch it on.

No failures modelled that I know of (for me it is on all aircraft) and all FS failures "off".

John

_________________

My co-pilot is called Sid and he's a real Star!


Top
Profile Quote
Display: Sort by: Direction:
Post Reply   Page 1 of 2  [ 15 posts ]
Return to “FDC Support” | Jump to page 1 2 »
Jump to: