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GA small aircraft pilot descends too early on glide slope inoperative approach, develops unstabilized approach.
| Attributes | |
| ACN | 174408 |
| Time | |
| Date | 199103 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : lch |
| State Reference | LA |
| Altitude | msl bound lower : 800 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : lch tower : lch artcc : zdc |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 2 Eng, Retractable Gear |
| Flight Phase | descent : approach |
| Route In Use | approach : circling |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 54 flight time total : 3808 |
| ASRS Report | 174408 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On IFR from mcb to lch, I was cleared for the ILS runway 15 approach. I was instructed to maintain 1500' until crossing keyli intersection. I was told that the G/south was OTS. Upon receiving this information, I wrongly interpreted that I had already crossed keyli (although I had not yet received the OM on my audio panel, nor had I seen the ADF needle swing, to confirm keyli passage), and misinterp ATC's information and believing I was past keyli, I began descent too early. I was passed to tower, cleared to land 1 or 2 mins later, tower said, 'we have a low altitude alert for you. Climb immediately to 1500'. You are not to descend below 1500' in this sector--until crossing keyli.' I climbed as instructed and continued the approach to a successful and uneventful landing--the only exception being that I was timid and late in descent, following this experience and had to request a circling approach in order to land. It was granted. There was an approaching solid line of thunderstorms and considerable moderate turbulence during cruise and during approach. I can see that I allowed this stress to condition me to hear what I wanted to hear.
Original NASA ASRS Text
Title: GA SMA PLT DESCENDS TOO EARLY ON GLIDE SLOPE INOPERATIVE APCH, DEVELOPS UNSTABILIZED APCH.
Narrative: ON IFR FROM MCB TO LCH, I WAS CLRED FOR THE ILS RWY 15 APCH. I WAS INSTRUCTED TO MAINTAIN 1500' UNTIL XING KEYLI INTXN. I WAS TOLD THAT THE G/S WAS OTS. UPON RECEIVING THIS INFO, I WRONGLY INTERPRETED THAT I HAD ALREADY CROSSED KEYLI (ALTHOUGH I HAD NOT YET RECEIVED THE OM ON MY AUDIO PANEL, NOR HAD I SEEN THE ADF NEEDLE SWING, TO CONFIRM KEYLI PASSAGE), AND MISINTERP ATC'S INFO AND BELIEVING I WAS PAST KEYLI, I BEGAN DSNT TOO EARLY. I WAS PASSED TO TWR, CLRED TO LAND 1 OR 2 MINS LATER, TWR SAID, 'WE HAVE A LOW ALT ALERT FOR YOU. CLB IMMEDIATELY TO 1500'. YOU ARE NOT TO DSND BELOW 1500' IN THIS SECTOR--UNTIL XING KEYLI.' I CLBED AS INSTRUCTED AND CONTINUED THE APCH TO A SUCCESSFUL AND UNEVENTFUL LNDG--THE ONLY EXCEPTION BEING THAT I WAS TIMID AND LATE IN DSNT, FOLLOWING THIS EXPERIENCE AND HAD TO REQUEST A CIRCLING APCH IN ORDER TO LAND. IT WAS GRANTED. THERE WAS AN APCHING SOLID LINE OF TSTMS AND CONSIDERABLE MODERATE TURB DURING CRUISE AND DURING APCH. I CAN SEE THAT I ALLOWED THIS STRESS TO CONDITION ME TO HEAR WHAT I WANTED TO HEAR.
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.