VOR Display in Jets?

Question

just like piston planes does jets also have VOR display to perform instrumental landing without AP On ??

Answer 1

All USAF aircraft now have an ILS system for landing. Some haven't had VOR, but used TACAN (Tactical Air Navigation) for flying routes, since most combat flying is to and from the base installation/ship.

I know the early aircraft I worked on, F4 and A7, only had TACAN. If the A7 had an ILS, it must have been good because it never broke. Most of the TACAN jobs on that aircraft entailed replacing a fuse. If the pilot went to transmit on the TACAN before the 90 second warm-up time, the fuse would blow. Oh, the memories...

On fighters, there are several avionics bays on the side of the aircraft that contain the system components. Signals are displayed on the HSI, Horizontal Situation Indicator for the azimuth signals, and the ADI, Attitude Displacement Indicator for the ILS steering signals.

Answer 2

I have never heard of a VOR display being required for instrument flight...  I have flown a lot of airplanes that either did not have them, or they were inop under IFR conditions...and now with GPS and even going back to INS, and wow... anyone remember LORAN... not only were vor's not required, they were not even used. Only in the case of an approach or route segment that cannot be determined by any other method, would a VOR be required... and that goes back to the old you gotta have it to do it flight plan.  The reason that jet aircraft don't rely on the VOR's any more is simply because there are better systems now affordable and available that have more features, do more things, also the VOR's are relatively short ranged compared to other NAV methods, and have more error as you get further from the station. Even though the VOR has been phased out in some areas, it will remain around for a while longer.

Answer 3

Practically all aircraft have VOR instruments of some kind, and they are required for instrument flight.

Answer 4

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Answer 5

Yep.

Answer 6

Yes most jets can navigate by use of VOR's (also NDB's).  GPS is usually the primary navigation used these days.  The FMS gets it's position from many sources and compares them to get the most accurate positon.  GPS is usually the most accurate followed by DME/DME and a VOR/DME mix.  I have lost both GPS signals for a short time and the FMS was getting the position from VOR/DME's.  IRS systems are not very accurate and drift off the current positon by several miles on international flights.  

On instrument landings VOR approaches are loaded into the FMS and done as RNAV approaches.  The FAA is working to get all VOR and NDB approaches approved as RNAV approaches also.  If the VOR approach is not approved for RNAV, it is still done with the FMS and a VOR bearing pointer is brought up on the primary flight display (shows up like a RMI) to make it legal.  

If the FMS fails, pilots can still bring up the VOR on the PFD.  If all that fails the RTU (radio tuning unit) can be used as a HSI to display the VOR and ILS.

This is how most "glass cockpits" work.  There are differences between avionics and airplanes.

Older jets like 727's or DC-9's might not even have FMS of GPS.  They fly the country VOR to VOR.

Answer 7

Just about any modern jet have VOR support, however, that's not going to last forever.  There is already talk at the big avionics vendors about when to not include it anymore.  The VOR display works just like it does on a Cessna.  Sometimes, it may be integrated with a digital glass "PFD" display, where the pilot can select what nav source to display (i.e. VOR, LOC, FMS, etc).  In airlines, VORs are typically only used as backup.