Flying the Green Data???
09-02-2007, 09:38 AM
#1
Gets Weekends Off
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Joined APC: Feb 2007
Position: CFII MEI
Posts: 331
Flying the Green Data???
Hey guys, I haven't heard of this before but I was taking an FAA course and it mentioned that airline pilots will back up their GPS/VOR navagation means by "Flying Green Data" which says that its basically a form a dead reckoning in the event of failure of the nav systems... By knowing your heading, altitude and distance to the next fix.
Flying the Green Data? I have never heard of this... You guys do this often? Would somebody elaborate? Is this just an airline version of pilotage and dead reckoning?
Why is it called "Green Data"?
Flying the Green Data? I have never heard of this... You guys do this often? Would somebody elaborate? Is this just an airline version of pilotage and dead reckoning?
Why is it called "Green Data"?
09-02-2007, 09:54 AM
#2
Gets Weekends Off
Joined APC: Dec 2005
Position: A320 CA
Posts: 588
Originally Posted by skycowboy
Hey guys, I haven't heard of this before but I was taking an FAA course and it mentioned that airline pilots will back up their GPS/VOR navagation means by "Flying Green Data" which says that its basically a form a dead reckoning in the event of failure of the nav systems... By knowing your heading, altitude and distance to the next fix.
Flying the Green Data? I have never heard of this... You guys do this often? Would somebody elaborate? Is this just an airline version of pilotage and dead reckoning?
Why is it called "Green Data"?
Flying the Green Data? I have never heard of this... You guys do this often? Would somebody elaborate? Is this just an airline version of pilotage and dead reckoning?
Why is it called "Green Data"?
09-02-2007, 10:43 AM
#4
Prime Minister/Moderator
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,253
Originally Posted by ERJ135
Its flying in the Green World and the Magenta world. Green is conventional nav and magenta is FMS.
09-02-2007, 03:13 PM
#9
Prime Minister/Moderator
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,253
Originally Posted by skycowboy
K, so what the heck does "flying green data" mean? Is it just raw nav stuff?
The GS is presented on one side of the PFD.
Normally you fly white needles (or magaenta or whatever color depending on the airplane) which means the FMS auto-tunes whatever navaids it wants and utilizes the data it recieves to track a pre-programmed route. It also uses GPS so if either GPS or VOR/DME was unavailable hopefully you would have a backup. The FMS is normally coupled to the AP.
09-04-2007, 09:08 AM
#10
Gets Weekends Off
Joined APC: Jan 2007
Position: B737/FO
Posts: 227
Originally Posted by skycowboy
K, so what the heck does "flying green data" mean? Is it just raw nav stuff?
The Honeywell FMS's that Gulfstream uses look for GPS first, then DME/DME, VOR/DME, and finally inertial nav (IRS). If GPS signal is lost, the FMS will look for multiple DME signals to triangulate.
If you lose GPS overwater and out of range of NAVAIDS, then you are stuck w/IRS's which are good for 6.2 hours before they drift too far out of tolerances.
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