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C560 makes a go around inside FAF on NDB or GPS runway 5 app at mmu. Reporter states CAT NDB well known amongst area pilots as inaccurate.
| Attributes | |
| ACN | 582578 |
| Time | |
| Date | 200305 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : cat.ndb |
| State Reference | NJ |
| Altitude | msl single value : 2000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mmu.tower |
| Operator | general aviation : corporate |
| Make Model Name | Citation V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other other ndb |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument non precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 110 flight time total : 6060 flight time type : 990 |
| ASRS Report | 582578 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Events | |
| Anomaly | other anomaly other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment other aircraft equipment : gps |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : executed go around flight crew : overcame equipment problem |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Navigational Facility |
| Primary Problem | Flight Crew Human Performance |
| Situations | |
| Navigational Aid | CAT.NDB |
Narrative:
We were being vectored for the NDB runway 5 approach into mmu. The FMS CDI needle came in but the NDB wasn't yet. We initially tried to intercept the NDB needle as we had a strong correctly identified signal and were cleared for that approach. It started to become clear that the two needles would be out of tolerance and about then the tower said they showed us right of course. We elected to miss the approach and asked to be vectored for a wide approach and have ATC verify we were on the inbound course. They did this and the GPS matched perfectly when they said we were on course with the NDB being closer this time. We broke out at the final approach fix and landed. I called the tower on the phone and asked if we did anything wrong, the controller said, 'no, that NDB is notoriously inaccurate, we have no problem with what you did.' I appreciate the tower controller's understanding as well as the approach controller's help. That day another pilot told me the same thing had happened to him there 10 yrs ago. Another pilot told my first officer something about that NDB being messed up for 10 yrs. I recommend they decommission that NDB and replace it with one with a different frequency and a different name, that is the only way I will trust it in the future.
Original NASA ASRS Text
Title: C560 MAKES A GAR INSIDE FAF ON NDB OR GPS RWY 5 APP AT MMU. RPTR STATES CAT NDB WELL KNOWN AMONGST AREA PLTS AS INACCURATE.
Narrative: WE WERE BEING VECTORED FOR THE NDB RWY 5 APCH INTO MMU. THE FMS CDI NEEDLE CAME IN BUT THE NDB WASN'T YET. WE INITIALLY TRIED TO INTERCEPT THE NDB NEEDLE AS WE HAD A STRONG CORRECTLY IDENTIFIED SIGNAL AND WERE CLRED FOR THAT APCH. IT STARTED TO BECOME CLR THAT THE TWO NEEDLES WOULD BE OUT OF TOLERANCE AND ABOUT THEN THE TWR SAID THEY SHOWED US R OF COURSE. WE ELECTED TO MISS THE APCH AND ASKED TO BE VECTORED FOR A WIDE APCH AND HAVE ATC VERIFY WE WERE ON THE INBND COURSE. THEY DID THIS AND THE GPS MATCHED PERFECTLY WHEN THEY SAID WE WERE ON COURSE WITH THE NDB BEING CLOSER THIS TIME. WE BROKE OUT AT THE FINAL APCH FIX AND LANDED. I CALLED THE TWR ON THE PHONE AND ASKED IF WE DID ANYTHING WRONG, THE CTLR SAID, 'NO, THAT NDB IS NOTORIOUSLY INACCURATE, WE HAVE NO PROB WITH WHAT YOU DID.' I APPRECIATE THE TWR CTLR'S UNDERSTANDING AS WELL AS THE APCH CTLR'S HELP. THAT DAY ANOTHER PLT TOLD ME THE SAME THING HAD HAPPENED TO HIM THERE 10 YRS AGO. ANOTHER PLT TOLD MY FO SOMETHING ABOUT THAT NDB BEING MESSED UP FOR 10 YRS. I RECOMMEND THEY DECOMMISSION THAT NDB AND REPLACE IT WITH ONE WITH A DIFFERENT FREQ AND A DIFFERENT NAME, THAT IS THE ONLY WAY I WILL TRUST IT IN THE FUTURE.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.