|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : svm|
airport : fnt
|Altitude||msl bound lower : 4700|
msl bound upper : 5000
|Controlling Facilities||tracon : dtw|
|Operator||general aviation : personal|
|Make Model Name||Any Unknown or Unlisted Aircraft Manufacturer|
|Operating Under FAR Part||Part 91|
|Flight Phase||cruise other|
|Function||instruction : instructor|
|Qualification||other other : other|
pilot : commercial
pilot : instrument
pilot : cfi
|Experience||flight time last 90 days : 45|
flight time total : 1300
flight time type : 700
|Function||instruction : trainee|
|Qualification||pilot : private|
|Anomaly||aircraft equipment problem : less severe|
other anomaly other
|Independent Detector||other controllera|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
Flint departure just handed us off to detroit approach, who gave us a new altimeter setting, which was noticeably higher than flint's. We reset the altimeter and adjusted our altitude. We understood the new setting to be 30.37. Soon, detroit advised us that we were 300 ft low, and told us that the correct altimeter was 30.27. Even after resetting to 30.27, we were still advised of being 100-200 ft low, but soon were told we were at the assigned altitude (5000 ft). Previously, flint had no problem with our altitude readout. Detroit said that maybe the difference was due to colder temperatures in our location. In the future I will clarify any altimeter setting that doesn't initially seem right. Also, I will request periodic mode C checks while airborne.
Original NASA ASRS Text
Title: DURING AN INST TRAINING FLT THE WRONG ALTIMETER SETTING WAS MADE CAUSING A LOW ALT READOUT TO ATC. IN ADDITION, THE MODE C ALT READOUT SEEMS TO DIFFER TO THAT OF THE ACFT ALTIMETER IN SOME INSTANCES ACCORDING TO ATC FEEDBACK.
Narrative: FLINT DEP JUST HANDED US OFF TO DETROIT APCH, WHO GAVE US A NEW ALTIMETER SETTING, WHICH WAS NOTICEABLY HIGHER THAN FLINT'S. WE RESET THE ALTIMETER AND ADJUSTED OUR ALT. WE UNDERSTOOD THE NEW SETTING TO BE 30.37. SOON, DETROIT ADVISED US THAT WE WERE 300 FT LOW, AND TOLD US THAT THE CORRECT ALTIMETER WAS 30.27. EVEN AFTER RESETTING TO 30.27, WE WERE STILL ADVISED OF BEING 100-200 FT LOW, BUT SOON WERE TOLD WE WERE AT THE ASSIGNED ALT (5000 FT). PREVIOUSLY, FLINT HAD NO PROB WITH OUR ALT READOUT. DETROIT SAID THAT MAYBE THE DIFFERENCE WAS DUE TO COLDER TEMPS IN OUR LOCATION. IN THE FUTURE I WILL CLARIFY ANY ALTIMETER SETTING THAT DOESN'T INITIALLY SEEM RIGHT. ALSO, I WILL REQUEST PERIODIC MODE C CHKS WHILE AIRBORNE.
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.