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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Private small transport pilot reads wrong DME during fluctuating readouts and turns 3 mi too soon on STAR arrival procedure. Had switched #2 VOR for a xradial reading and read that DME instead of #1 DME. Failed to advise ATC of navigation equipment problem.
| Attributes | |
| ACN | 364901 |
| Time | |
| Date | 199703 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cve |
| State Reference | TX |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 25 flight time total : 900 flight time type : 800 |
| ASRS Report | 364901 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : far non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Event: premature turn on STAR (knead 1 arrival -- dallas, ft worth). ATC vectored me from south to intercept R213 cve on knead 1 arrival. I was tracking cve R213 inbound when #1 and #2 DME readouts became intermittent at about knead (47 DME cve). Switched #2 VOR DME to mqp to identify tilla (mqp R119 and 42 DME cve) expecting to turn to 080 degrees as shown on STAR. When mqp R119 idented, DME readout showed 40 DME. Suspecting I had now passed tilla (42 DME), I made immediate right turn to 080 degrees as shown on STAR. ATC called to ask heading. I replied 080 degrees. ATC requested turn to 040 degrees. I switched back to cve and saw DME read 45 DME, which meant I had turned to 080 degrees too early. ATC sounded irritated, but no more was said. Corrective action: aircraft grounded and repairs to DME made. Human performance: in hindsight, I should have ignored all DME indications and relied only on xradial identify of tilla. Sight of 40 DME (actually from mqp) made me think I had overshot tilla. Probably should have declared DME inoperative and asked for radar identify of tilla also.
Original NASA ASRS Text
Title: PVT SMT PLT READS WRONG DME DURING FLUCTUATING READOUTS AND TURNS 3 MI TOO SOON ON STAR ARR PROC. HAD SWITCHED #2 VOR FOR A XRADIAL READING AND READ THAT DME INSTEAD OF #1 DME. FAILED TO ADVISE ATC OF NAV EQUIP PROB.
Narrative: EVENT: PREMATURE TURN ON STAR (KNEAD 1 ARR -- DALLAS, FT WORTH). ATC VECTORED ME FROM S TO INTERCEPT R213 CVE ON KNEAD 1 ARR. I WAS TRACKING CVE R213 INBOUND WHEN #1 AND #2 DME READOUTS BECAME INTERMITTENT AT ABOUT KNEAD (47 DME CVE). SWITCHED #2 VOR DME TO MQP TO IDENT TILLA (MQP R119 AND 42 DME CVE) EXPECTING TO TURN TO 080 DEGS AS SHOWN ON STAR. WHEN MQP R119 IDENTED, DME READOUT SHOWED 40 DME. SUSPECTING I HAD NOW PASSED TILLA (42 DME), I MADE IMMEDIATE R TURN TO 080 DEGS AS SHOWN ON STAR. ATC CALLED TO ASK HDG. I REPLIED 080 DEGS. ATC REQUESTED TURN TO 040 DEGS. I SWITCHED BACK TO CVE AND SAW DME READ 45 DME, WHICH MEANT I HAD TURNED TO 080 DEGS TOO EARLY. ATC SOUNDED IRRITATED, BUT NO MORE WAS SAID. CORRECTIVE ACTION: ACFT GNDED AND REPAIRS TO DME MADE. HUMAN PERFORMANCE: IN HINDSIGHT, I SHOULD HAVE IGNORED ALL DME INDICATIONS AND RELIED ONLY ON XRADIAL IDENT OF TILLA. SIGHT OF 40 DME (ACTUALLY FROM MQP) MADE ME THINK I HAD OVERSHOT TILLA. PROBABLY SHOULD HAVE DECLARED DME INOP AND ASKED FOR RADAR IDENT OF TILLA ALSO.
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.