Reporter descends 400 ft below assigned altitude.

Attributes
ACN	303190
Time
Date	199504
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sav
State Reference	GA
Altitude	msl bound lower : 8600 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 45 flight time total : 1300 flight time type : 45
ASRS Report	303190
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other other : unspecified cockpit
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While descending from 11000 ft to 9000 ft I inadvertently descended to 8600 ft. Problem caused while adjusting mixtures without watching altimeter.

Original NASA ASRS Text

Title: RPTR DSNDS 400 FT BELOW ASSIGNED ALT.

Narrative: WHILE DSNDING FROM 11000 FT TO 9000 FT I INADVERTENTLY DSNDED TO 8600 FT. PROB CAUSED WHILE ADJUSTING MIXTURES WITHOUT WATCHING ALTIMETER.

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.