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On practice ldg approach to oxr pilot of small aircraft descended below published approach altitude and tower got GPWS.
| Attributes | |
| ACN | 173068 |
| Time | |
| Date | 199102 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : oxr |
| State Reference | CA |
| Altitude | msl bound lower : 2000 msl bound upper : 3300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : oxr |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | descent : approach descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 14 flight time total : 571 flight time type : 200 |
| ASRS Report | 173068 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On a proficiency practice approach to oxnard airport, I descended below minimum altitude for that segment. I had misread the approach plate (copy enclosed) and was mentally one segment ahead of the 'step downs' at hyden and nelly. When I was actually outside nelly I thought I was outside of pards and descended until approach called an altitude alert and emergency climb. The safety pilot had earlier tried to bring this to my attention by asking, 'isn't this an ILS, not an lda?' or words to the affect. We analyzed this later and concluded I was preoccupied during the approach with not shock cooling a new cylinder. I was focused on reducing altitude as soon as possible. Procedurally I was so intent on getting down I ignored the fact that the G/south is always lower than the step down. Close inspection of the approach plate, under better light would have shown that while there are 4 intxns off fim in the overhead only the inside 3 are step downs and depicted in the side view.
Original NASA ASRS Text
Title: ON PRACTICE LDG APCH TO OXR PLT OF SMA DESCENDED BELOW PUBLISHED APCH ALT AND TWR GOT GPWS.
Narrative: ON A PROFICIENCY PRACTICE APCH TO OXNARD ARPT, I DSNDED BELOW MINIMUM ALT FOR THAT SEGMENT. I HAD MISREAD THE APCH PLATE (COPY ENCLOSED) AND WAS MENTALLY ONE SEGMENT AHEAD OF THE 'STEP DOWNS' AT HYDEN AND NELLY. WHEN I WAS ACTUALLY OUTSIDE NELLY I THOUGHT I WAS OUTSIDE OF PARDS AND DSNDED UNTIL APCH CALLED AN ALT ALERT AND EMER CLB. THE SAFETY PLT HAD EARLIER TRIED TO BRING THIS TO MY ATTN BY ASKING, 'ISN'T THIS AN ILS, NOT AN LDA?' OR WORDS TO THE AFFECT. WE ANALYZED THIS LATER AND CONCLUDED I WAS PREOCCUPIED DURING THE APCH WITH NOT SHOCK COOLING A NEW CYLINDER. I WAS FOCUSED ON REDUCING ALT ASAP. PROCEDURALLY I WAS SO INTENT ON GETTING DOWN I IGNORED THE FACT THAT THE G/S IS ALWAYS LOWER THAN THE STEP DOWN. CLOSE INSPECTION OF THE APCH PLATE, UNDER BETTER LIGHT WOULD HAVE SHOWN THAT WHILE THERE ARE 4 INTXNS OFF FIM IN THE OVERHEAD ONLY THE INSIDE 3 ARE STEP DOWNS AND DEPICTED IN THE SIDE VIEW.
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.