An approach controller questioned the altitude of an SF34L on the approach, and gave a new altimeter setting. The flight crew checked their altimeters, reported an altitude which was 300 ft below assigned altitude, and returned to the correct altitude. Altitude deviation altitude overshot.

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Attributes
ACN	340140
Time
Date	199602
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mkg
State Reference	MI
Altitude	msl bound lower : 1900 msl bound upper : 2300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mkg tower : hhr
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 9000
ASRS Report	340140
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 5500 flight time type : 3500
ASRS Report	328190
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Assigned 2300 ft and in level flight when controller questioned altitude, he stated 'showing 1900 ft' and gave altimeter setting of 29.54 inches. We verified altimeter setting and reported indicating 2000 ft, and were instructed to and climbed back to 2300 ft. Cleared for and completed visual approach. No further abnormalities.

Original NASA ASRS Text

Title: AN APCH CTLR QUESTIONED THE ALT OF AN SF34L ON THE APCH, AND GAVE A NEW ALTIMETER SETTING. THE FLC CHKED THEIR ALTIMETERS, RPTED AN ALT WHICH WAS 300 FT BELOW ASSIGNED ALT, AND RETURNED TO THE CORRECT ALT. ALTDEV ALT OVERSHOT.

Narrative: ASSIGNED 2300 FT AND IN LEVEL FLT WHEN CTLR QUESTIONED ALT, HE STATED 'SHOWING 1900 FT' AND GAVE ALTIMETER SETTING OF 29.54 INCHES. WE VERIFIED ALTIMETER SETTING AND RPTED INDICATING 2000 FT, AND WERE INSTRUCTED TO AND CLBED BACK TO 2300 FT. CLRED FOR AND COMPLETED VISUAL APCH. NO FURTHER ABNORMALITIES.

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.