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Air taxi pilot reports flying the RNAV runway 25L approach to dvt using LNAV minimums due to waas being unavailable for unknown reasons. The approach is continued below minimums when the runway is thought to be sighted; although this turns out to be incorrect and a normal landing ensues.
| Attributes | |
| ACN | 1137218 |
| Time | |
| Date | 201312 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | DVT.Airport |
| State Reference | AZ |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | GPS & Other Satellite Navigation |
| Person 1 | |
| Function | Pilot Flying Single Pilot |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Inflight Event / Encounter Unstabilized Approach |
Narrative:
[I] was cleared for GPS 25L approach into dvt. Approach was going smoothly. [I] was not able to get lpv on GPS. At the MDA I thought I saw the airport. I began to descend early. I then saw the correct lights 2 miles ahead. I was VFR at this time and remained so. [I was] still above the lower lpv minimums but below LNAV minimums for the approach. I really thought I was looking at the airport lights when I began to descend. Terrain was visible and well marked so I stayed where I was. I really wish I had a good answer for this. We just do not fly enough in actual IFR. I was much sharper under 121 flying than I am today. Two pilots would have helped although I know unrealistic for 99.9 percent of the flying that we do.
Original NASA ASRS Text
Title: Air Taxi pilot reports flying the RNAV Runway 25L approach to DVT using LNAV minimums due to WAAS being unavailable for unknown reasons. The approach is continued below minimums when the runway is thought to be sighted; although this turns out to be incorrect and a normal landing ensues.
Narrative: [I] was cleared for GPS 25L approach into DVT. Approach was going smoothly. [I] was not able to get LPV on GPS. At the MDA I thought I saw the airport. I began to descend early. I then saw the correct lights 2 miles ahead. I was VFR at this time and remained so. [I was] still above the lower LPV minimums but below LNAV minimums for the approach. I really thought I was looking at the airport lights when I began to descend. Terrain was visible and well marked so I stayed where I was. I really wish I had a good answer for this. We just do not fly enough in actual IFR. I was much sharper under 121 flying than I am today. Two pilots would have helped although I know unrealistic for 99.9 percent of the flying that we do.
Data retrieved from NASA's ASRS site as of July 2013 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.