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B737 crew has difficulty using an NDB in the high altitude structure for navigation when signal is weak. Traffic conflict was the result.
| Attributes | |
| ACN | 460060 |
| Time | |
| Date | 200001 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : diw.ndb |
| State Reference | NC |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other ndb |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j174.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3200 flight time type : 1000 |
| ASRS Report | 460060 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : took evasive action |
| Supplementary | |
| Problem Areas | Airspace Structure Navigational Facility Flight Crew Human Performance |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| Navigational Aid | DIW.NDB |
Narrative:
Approaching the dixon NDB, we received faulty bearing to the station. We were to join J174 after diw. Approximately 20 mi south, I asked ZDC for a heading to join the airway south of orf. This request was denied, as was our request for direct. To continue to fly J174 off the diw NDB required a 40 degree turn to the west. After this maneuver, we were directed back to a 040 degree heading, and an air carrier aircraft was turned to the west. Factors to event: diw is a poor NAVAID. GPS is not installed on these aircraft. I did not ensure my request to ATC was clearly understood.
Original NASA ASRS Text
Title: B737 CREW HAS DIFFICULTY USING AN NDB IN THE HIGH ALT STRUCTURE FOR NAV WHEN SIGNAL IS WEAK. TFC CONFLICT WAS THE RESULT.
Narrative: APCHING THE DIXON NDB, WE RECEIVED FAULTY BEARING TO THE STATION. WE WERE TO JOIN J174 AFTER DIW. APPROX 20 MI S, I ASKED ZDC FOR A HDG TO JOIN THE AIRWAY S OF ORF. THIS REQUEST WAS DENIED, AS WAS OUR REQUEST FOR DIRECT. TO CONTINUE TO FLY J174 OFF THE DIW NDB REQUIRED A 40 DEG TURN TO THE W. AFTER THIS MANEUVER, WE WERE DIRECTED BACK TO A 040 DEG HDG, AND AN ACR ACFT WAS TURNED TO THE W. FACTORS TO EVENT: DIW IS A POOR NAVAID. GPS IS NOT INSTALLED ON THESE ACFT. I DID NOT ENSURE MY REQUEST TO ATC WAS CLRLY UNDERSTOOD.
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.