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Altitude deviation altitude excursion from assigned during IAP localizer approach in a night operation.
| Attributes | |
| ACN | 201705 |
| Time | |
| Date | 199201 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : spa |
| State Reference | SC |
| Altitude | msl bound lower : 1400 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : gsp |
| Operator | general aviation : instructional |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 1428 flight time type : 80 |
| ASRS Report | 201705 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot instruction : trainee |
| Qualification | pilot : private |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera other other : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After crossing 'trest intersection' my student thought he had also crossed the 'LOM' which we up to that point had not. He therefore started a descent down to 1220 ft using greer's altimeter setting. We had already been switched to unicom so ATC was unable to notify us immediately. By the time I caught his descending through 2000 ft we already were at 1400 ft, so I immediately advised my student that we needed to go missed approach. Another pilot then relayed a message from approach control that their altitude alert had gone off and that we should check our altitude. Part of the problem was that I hadn't shot the approach myself in awhile, and I was distraction by the WX conditions and therefore didn't catch his descent through MDA soon enough. Since then I have tried to pay closer attention to them, especially on the approachs I'm not as familiar with.
Original NASA ASRS Text
Title: ALTDEV ALT EXCURSION FROM ASSIGNED DURING IAP LOC APCH IN A NIGHT OP.
Narrative: AFTER XING 'TREST INTXN' MY STUDENT THOUGHT HE HAD ALSO CROSSED THE 'LOM' WHICH WE UP TO THAT POINT HAD NOT. HE THEREFORE STARTED A DSCNT DOWN TO 1220 FT USING GREER'S ALTIMETER SETTING. WE HAD ALREADY BEEN SWITCHED TO UNICOM SO ATC WAS UNABLE TO NOTIFY US IMMEDIATELY. BY THE TIME I CAUGHT HIS DSNDING THROUGH 2000 FT WE ALREADY WERE AT 1400 FT, SO I IMMEDIATELY ADVISED MY STUDENT THAT WE NEEDED TO GO MISSED APCH. ANOTHER PLT THEN RELAYED A MESSAGE FROM APCH CTL THAT THEIR ALT ALERT HAD GONE OFF AND THAT WE SHOULD CHK OUR ALT. PART OF THE PROBLEM WAS THAT I HADN'T SHOT THE APCH MYSELF IN AWHILE, AND I WAS DISTR BY THE WX CONDITIONS AND THEREFORE DIDN'T CATCH HIS DSCNT THROUGH MDA SOON ENOUGH. SINCE THEN I HAVE TRIED TO PAY CLOSER ATTN TO THEM, ESPECIALLY ON THE APCHS I'M NOT AS FAMILIAR WITH.
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.