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Training flight in small aircraft at 4100' MSL was reported by TRACON as being 4400' with an altitude alert.
| Attributes | |
| ACN | 173168 |
| Time | |
| Date | 199103 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : dxo |
| State Reference | MI |
| Altitude | msl bound lower : 4000 msl bound upper : 4400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | general aviation : instructional |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 830 flight time type : 200 |
| ASRS Report | 173168 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Qualification | pilot : student pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne less severe |
| Independent Detector | other controllera |
| Resolutory Action | aircraft : equipment problem dissipated |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While on an IFR flight plan in IMC from fnt to yip, ATC assigned an altitude of 4000'. I was the flight instrument supervising an instrument student. The students altitude deviated to 4100'. I told him to correct. Detroit approach advised me they just had an altitude alert on their screens, our mode C showed 4400'. I told ATC we were level at 4100' and asked them if they wanted us to stop altitude squawk. ATC replied negative. Same day I checked the mode C readout with mkg approach. I had an indicated altitude at that time of 2100' MSL and ATC showed the same readout. I notified maintenance at the FBO.
Original NASA ASRS Text
Title: TRAINING FLT IN SMA AT 4100' MSL WAS REPORTED BY TRACON AS BEING 4400' WITH AN ALT ALERT.
Narrative: WHILE ON AN IFR FLT PLAN IN IMC FROM FNT TO YIP, ATC ASSIGNED AN ALT OF 4000'. I WAS THE FLT INSTR SUPERVISING AN INSTRUMENT STUDENT. THE STUDENTS ALT DEVIATED TO 4100'. I TOLD HIM TO CORRECT. DETROIT APCH ADVISED ME THEY JUST HAD AN ALT ALERT ON THEIR SCREENS, OUR MODE C SHOWED 4400'. I TOLD ATC WE WERE LEVEL AT 4100' AND ASKED THEM IF THEY WANTED US TO STOP ALT SQUAWK. ATC REPLIED NEGATIVE. SAME DAY I CHKED THE MODE C READOUT WITH MKG APCH. I HAD AN INDICATED ALT AT THAT TIME OF 2100' MSL AND ATC SHOWED THE SAME READOUT. I NOTIFIED MAINT AT THE FBO.
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.