Beech jet 400 aircraft in descent was reported 300 ft low by ATC. Reporter captain says his altimeter showed 200 ft low and turbulence contributed to the deviation.

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Attributes
ACN	371210
Time
Date	199706
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bos
State Reference	MA
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	general aviation : corporate
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	371210
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC advised us showing 300 ft low. We were showing 200 ft low due to turbulence. We corrected our altitude and checked proper altimeter setting. Nothing further was mentioned by ATC. No conflicts were reported.

Original NASA ASRS Text

Title: BEECH JET 400 ACFT IN DSCNT WAS RPTED 300 FT LOW BY ATC. RPTR CAPT SAYS HIS ALTIMETER SHOWED 200 FT LOW AND TURB CONTRIBUTED TO THE DEV.

Narrative: ATC ADVISED US SHOWING 300 FT LOW. WE WERE SHOWING 200 FT LOW DUE TO TURB. WE CORRECTED OUR ALT AND CHKED PROPER ALTIMETER SETTING. NOTHING FURTHER WAS MENTIONED BY ATC. NO CONFLICTS WERE RPTED.

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.