Beech kingair 90 pilot has an altitude deviation during approach to lan.

Attributes
ACN	699874
Time
Date	200606
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lan.airport
State Reference	MI
Altitude	msl single value : 2500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lan.tracon
Operator	common carrier : air taxi
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 170 flight time total : 2500 flight time type : 50
ASRS Report	699874
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While descending to 2500 ft MSL for a visual approach to lan; I went below the assigned altitude by approximately 300 ft. This caused a low altitude alert to sound for lansing approach. There is no excuse for my action; I simply was reading an approach plate when I looked up and noticed my altitude. Also I had not yet received a new lan altimeter setting which caused me to be a little lower than I thought.

Original NASA ASRS Text

Title: BEECH KINGAIR 90 PLT HAS AN ALTDEV DURING APCH TO LAN.

Narrative: WHILE DSNDING TO 2500 FT MSL FOR A VISUAL APCH TO LAN; I WENT BELOW THE ASSIGNED ALT BY APPROX 300 FT. THIS CAUSED A LOW ALT ALERT TO SOUND FOR LANSING APCH. THERE IS NO EXCUSE FOR MY ACTION; I SIMPLY WAS READING AN APCH PLATE WHEN I LOOKED UP AND NOTICED MY ALT. ALSO I HAD NOT YET RECEIVED A NEW LAN ALTIMETER SETTING WHICH CAUSED ME TO BE A LITTLE LOWER THAN I THOUGHT.

Data retrieved from NASA's ASRS site as of January 2009 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.