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During an instrument approach DME arc, pilot, with instructor, lost use of their DME resulting in the controller intervening to alert them of not being on the DME arc. Pilots canceled their IFR clearance since they were in VFR conditions and were then cleared direct to the VOR.
| Attributes | |
| ACN | 539539 |
| Time | |
| Date | 200203 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : ykm.vortac |
| State Reference | WA |
| Altitude | msl single value : 6300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : psc.tracon |
| Operator | general aviation : instructional |
| Make Model Name | Small Aircraft, Low Wing, 2 Eng, Retractable Gear |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | ils localizer only : 27 other other vortac |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument non precision arrival : vfr enroute airway : v468.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | instruction : instructor |
| Qualification | pilot : instrument pilot : cfi pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 90 flight time total : 9600 flight time type : 45 |
| ASRS Report | 539539 |
| Person 2 | |
| Affiliation | other |
| Function | instruction : trainee |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert controller : provided flight assist |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
As we approached the ykm 16 DME arc on V468 from eln, the DME broke lock. The non certified LORAN had a red accuracy warning light, but it had been agreeing with the VOR and DME for most of the flight. The trainee attempted to intercept the 16 DME arc using the LORAN. TRACON advised that we were inside the arc and we turned to the southwest to try to reintercept the arc. TRACON then advised that we were wandering around the arc. I canceled IFR and advised that we had an inoperative DME. We then were cleared direct to ykm VOR for the ILS runway 27 approach VFR. We should not have tried to save the approach with malfunctioning/uncertified equipment.
Original NASA ASRS Text
Title: DURING AN INST APCH DME ARC, PLT, WITH INSTRUCTOR, LOST USE OF THEIR DME RESULTING IN THE CTLR INTERVENING TO ALERT THEM OF NOT BEING ON THE DME ARC. PLTS CANCELED THEIR IFR CLRNC SINCE THEY WERE IN VFR CONDITIONS AND WERE THEN CLRED DIRECT TO THE VOR.
Narrative: AS WE APCHED THE YKM 16 DME ARC ON V468 FROM ELN, THE DME BROKE LOCK. THE NON CERTIFIED LORAN HAD A RED ACCURACY WARNING LIGHT, BUT IT HAD BEEN AGREEING WITH THE VOR AND DME FOR MOST OF THE FLT. THE TRAINEE ATTEMPTED TO INTERCEPT THE 16 DME ARC USING THE LORAN. TRACON ADVISED THAT WE WERE INSIDE THE ARC AND WE TURNED TO THE SW TO TRY TO REINTERCEPT THE ARC. TRACON THEN ADVISED THAT WE WERE WANDERING AROUND THE ARC. I CANCELED IFR AND ADVISED THAT WE HAD AN INOP DME. WE THEN WERE CLRED DIRECT TO YKM VOR FOR THE ILS RWY 27 APCH VFR. WE SHOULD NOT HAVE TRIED TO SAVE THE APCH WITH MALFUNCTIONING/UNCERTIFIED EQUIP.
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.