Posted: 10 Jun 2019, 18:09Posted: 10 Jun 2019, 18:12Posted: 10 Jun 2019, 21:32Posted: 12 Jun 2019, 03:18outlaw162 wrote:Looking at some representative pictures of the HMDS display from the Avionics forum, a couple of questions come to mind concerning the type of confusion with displays that can lead to misinterpretation.
In the first pic, how is it possible for the 'zero pitch line' (commonly called the horizon line, though incorrectly so) to overlay the terrain well below the zero pitch line as it passes through what appears to be a hill, with in fact the FPV symbol still on the 'zero pitch line' at the base of the hill? Also in the pic, the negative pitch line tabs that point to the zero pitch line are on the outboard ends of the lines themselves.
In the second schematic from the Norwegian discussion, the negative pitch line tabs are on the inboard ends of the lines, while the positive pitch line tabs are outboard. Never seen that before.
What would this guy have been looking at in that steep descent, assuming the display was functioning properly?
What would have been his best indication of "up"?
"...4.1.1.1. Helmet Mounted Display Virtual Heads-Up Display (HMD v-HUD). Note that under some flight regimes, the horizon line and pitch ladder collides (coexists) with the airspeed, altitude and heading symbology, causing potential readability issues;...: http://www.e-publishing.af.mil/shared/m ... -35AV3.pdf (0.5Mb) URL noworkee - PDF now attached - see page 26 for instrument flying stuff - NOPE computer says 'update file is EMPTY' - tried uploading a GIF of quote to NOPE so go to the thread URL for full text
Posted: 12 Jun 2019, 15:31Posted: 12 Jun 2019, 16:334.1.2. The primary unusual attitude reference is the HMD v-HUD. Do not use the HMD or SFD to recover from an unusual attitude or when executing lost wingman procedures except when no other attitude reference is available."
....His voice was calm
he flew into ocean
Posted: 12 Jun 2019, 17:42Posted: 12 Jun 2019, 18:54Posted: 12 Jun 2019, 22:24
07 Jun 2012 
I can post stuff 
I can post! 
Posted: 12 Jun 2019, 23:33Posted: 13 Jun 2019, 00:20outlaw162 wrote:On airliners with HUDs, PFRs were always head-down steam/MFD type....of course it's more straight forward when it comes to the HUD unusual attitude display in an airliner (or C-17/KC-46) type aircraft. You set pitch and roll thresholds, beyond which exceeding them results in automatic switching to the unusual attitude recovery display, the symbology specifically directed at recovery, though at times that switch-over itself could be disorienting.
With fighters there are normal occasions to fly thru any and every attitude so there's really no such thing as an 'unusual' attitude....only an unexpected or worse, undetermined one. I didn't care for that narrow little Block 10 HUD for flying instruments either....and that HMDS just looks claustrophobic and at times even overly informative.
Posted: 13 Jun 2019, 00:47Posted: 13 Jun 2019, 01:23marauder2048 wrote:outlaw162 wrote:On airliners with HUDs, PFRs were always head-down steam/MFD type....of course it's more straight forward when it comes to the HUD unusual attitude display in an airliner (or C-17/KC-46) type aircraft. You set pitch and roll thresholds, beyond which exceeding them results in automatic switching to the unusual attitude recovery display, the symbology specifically directed at recovery, though at times that switch-over itself could be disorienting.
With fighters there are normal occasions to fly thru any and every attitude so there's really no such thing as an 'unusual' attitude....only an unexpected or worse, undetermined one. I didn't care for that narrow little Block 10 HUD for flying instruments either....and that HMDS just looks claustrophobic and at times even overly informative.
So where was the incident pilot in your claimed normal distribution of pilot ability?
By your theory, he should have been nigh-invulnerable to spatial disorientation.
"We believe it highly likely the pilot was suffering from vertigo or spatial disorientation and wasn't aware of his condition," Defence Minister Takeshi Iwaya told a briefing. "It can affect any pilot regardless of their experience."
[previous page 'krieger22' : http://www.reuters.com/article/us-japan ... ce=twitter
Posted: 13 Jun 2019, 02:13outlaw162 wrote:What exactly is it that you do in aviation?
Posted: 13 Jun 2019, 06:36Orientation and disorientation in aviation [this pdf is in the attachment below]
John Richard Rollin Stott 2013
“...Conclusions
Much of the basic physiological science of relevance to disorientation in aircraft has been elucidated many decades ago, some even before the advent of powered flight. The practical problem remains as to how the subject should be taught and demonstrated to each successive generation of pilots to forewarn them and maintain their awareness of the potential dangers of disorientation in flight.”
Source: https://www.ncbi.nlm.nih.gov/pmc/articl ... 48-2-2.pdf (0.75Mb)