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#1
January 26th 07, 01:16 PM
posted to rec.aviation.ifr
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Comair 5191 HSI Heading Bugs?
Anyone familiar with how the autoflight/HSI interface works on a CRJ100
aircraft? The NTSB just released the factual data on the Comair crash at Lexington. Following is a summary page from the FDR report: http://tinyurl.com/2zovqb Does this mean the HSI heading bugs were also set to 226 or 227 degrees, magnetic? 
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#2
January 26th 07, 01:44 PM
posted to rec.aviation.ifr
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Comair 5191 HSI Heading Bugs?
Sam Spade wrote:
Anyone familiar with how the autoflight/HSI interface works on a CRJ100 aircraft? The NTSB just released the factual data on the Comair crash at Lexington. Following is a summary page from the FDR report: http://tinyurl.com/2zovqb Does this mean the HSI heading bugs were also set to 226 or 227 degrees, magnetic? I've never seen an inflight direction that wasn't in magnetic. 226 *IS* the magnetic heading of Runway 22. It's 222 true with a 4W variation.
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#3
January 26th 07, 01:58 PM
posted to rec.aviation.ifr
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Comair 5191 HSI Heading Bugs?
Ron Natalie wrote:
I've never seen an inflight direction that wasn't in magnetic. 226 *IS* the magnetic heading of Runway 22. It's 222 true with a 4W variation. Uh, yeah. I think the point Sam is trying to determine is whether the EHSI's had heading bugs pointing roughly 40 degrees off the aircraft heading while on the takeoff roll. If so, it would seem incredible that the pilots missed that fact. Happy Flying! Scott Skylane
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#4
January 26th 07, 03:07 PM
posted to rec.aviation.ifr
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Comair 5191 HSI Heading Bugs?
Ron Natalie wrote:
Sam Spade wrote: Anyone familiar with how the autoflight/HSI interface works on a CRJ100 aircraft? The NTSB just released the factual data on the Comair crash at Lexington. Following is a summary page from the FDR report: http://tinyurl.com/2zovqb Does this mean the HSI heading bugs were also set to 226 or 227 degrees, magnetic? I've never seen an inflight direction that wasn't in magnetic. 226 *IS* the magnetic heading of Runway 22. It's 222 true with a 4W variation. I understand that! ;-) I was being cautious in my posting; perhaps redundant. The question is: Do the settings shown on the FDR page I posted mean the HSI bugs were set to 226 or 227?
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#5
January 26th 07, 03:08 PM
posted to rec.aviation.ifr
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Comair 5191 HSI Heading Bugs?
Scott Skylane wrote:
Ron Natalie wrote: I've never seen an inflight direction that wasn't in magnetic. 226 *IS* the magnetic heading of Runway 22. It's 222 true with a 4W variation. Uh, yeah. I think the point Sam is trying to determine is whether the EHSI's had heading bugs pointing roughly 40 degrees off the aircraft heading while on the takeoff roll. If so, it would seem incredible that the pilots missed that fact. Happy Flying! Scott Skylane Thanks for the assist! ;-)
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#6
January 26th 07, 07:17 PM
posted to rec.aviation.ifr
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Comair 5191 HSI Heading Bugs?
Scott Skylane wrote:
Ron Natalie wrote: I've never seen an inflight direction that wasn't in magnetic. 226 *IS* the magnetic heading of Runway 22. It's 222 true with a 4W variation. Uh, yeah. I think the point Sam is trying to determine is whether the EHSI's had heading bugs pointing roughly 40 degrees off the aircraft heading while on the takeoff roll. If so, it would seem incredible that the pilots missed that fact. Happy Flying! Scott Skylane I have just read the NTSB Group Chairman's factual report. The FDR heading data proves the EHSI headings were set at 227.
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