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Air carrier X 5 mi south of airway CDI showed centerline of airway. Dpk 320 radial unreliable at lower altitude.
| Attributes | |
| ACN | 270596 |
| Time | |
| Date | 199405 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : dpk |
| State Reference | NY |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other other vortac |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zny |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 6215 flight time type : 3510 |
| ASRS Report | 270596 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
This is the second report I have filed concerning navigation problems around gayel intersection. The captain opted for a lower altitude to avoid some headwinds. (Normally we operate at 14000-17000 in this area). Some 5-10 NM southeast of gayel (according to our vors). The controller asked if we were still established on the dpk 320 degree radial. I replied, 'affirmative,' as 1 CDI showed ctring of the airway. (The other CDI was tuned to the approaching cpb 129 degree radial -- the bend in the airway at gayel). I then questioned the controller as to whether he concurred with our position. He replied that he showed us 4-5 mi south of the airway, appearing to parallel the course. No vector was given to correct, and we still showed on course, passing gayel, now heading to CF8. A short time later, we were instructed to climb to 13000 ft as 12000 ft was unusual (unavailable) due to traffic at our 11-12 O'clock at 6 NM (traffic was in sight). We complied and again stated that we continued to show on course. The controller made a passing statement that , 'perhaps that radar is unusable.' as I have stated in my earlier report, this type of thing happens about 30-40 percent of the time on this route (in my personal experience).
Original NASA ASRS Text
Title: ACR X 5 MI S OF AIRWAY CDI SHOWED CTRLINE OF AIRWAY. DPK 320 RADIAL UNRELIABLE AT LOWER ALT.
Narrative: THIS IS THE SECOND RPT I HAVE FILED CONCERNING NAV PROBS AROUND GAYEL INTXN. THE CAPT OPTED FOR A LOWER ALT TO AVOID SOME HEADWINDS. (NORMALLY WE OPERATE AT 14000-17000 IN THIS AREA). SOME 5-10 NM SE OF GAYEL (ACCORDING TO OUR VORS). THE CTLR ASKED IF WE WERE STILL ESTABLISHED ON THE DPK 320 DEG RADIAL. I REPLIED, 'AFFIRMATIVE,' AS 1 CDI SHOWED CTRING OF THE AIRWAY. (THE OTHER CDI WAS TUNED TO THE APCHING CPB 129 DEG RADIAL -- THE BEND IN THE AIRWAY AT GAYEL). I THEN QUESTIONED THE CTLR AS TO WHETHER HE CONCURRED WITH OUR POS. HE REPLIED THAT HE SHOWED US 4-5 MI S OF THE AIRWAY, APPEARING TO PARALLEL THE COURSE. NO VECTOR WAS GIVEN TO CORRECT, AND WE STILL SHOWED ON COURSE, PASSING GAYEL, NOW HDG TO CF8. A SHORT TIME LATER, WE WERE INSTRUCTED TO CLB TO 13000 FT AS 12000 FT WAS UNUSUAL (UNAVAILABLE) DUE TO TFC AT OUR 11-12 O'CLOCK AT 6 NM (TFC WAS IN SIGHT). WE COMPLIED AND AGAIN STATED THAT WE CONTINUED TO SHOW ON COURSE. THE CTLR MADE A PASSING STATEMENT THAT , 'PERHAPS THAT RADAR IS UNUSABLE.' AS I HAVE STATED IN MY EARLIER RPT, THIS TYPE OF THING HAPPENS ABOUT 30-40 PERCENT OF THE TIME ON THIS RTE (IN MY PERSONAL EXPERIENCE).
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.