Cleared to descend to 1800 ft during vector, got to 1440 ft.

Attributes
ACN	184624
Time
Date	199107
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : isp
State Reference	NY
Altitude	msl bound lower : 1450 msl bound upper : 1800
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : corporate
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time total : 4600
ASRS Report	184624
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	atc equipment other atc equipment : unspecified 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:

Radar vectored to ILS 24 at isp. Approach notified us we had low altitude alert. We were at 1440 ft and should have been at 1800 ft. We reset our altimeter to present setting and recapture GS. I was in right seat and pilot of record IFR flight plan was filed with me as pilot. Pressurized was our company aircraft. Pilot in left seat was IFR rated.

Original NASA ASRS Text

Title: CLRED TO DSND TO 1800 FT DURING VECTOR, GOT TO 1440 FT.

Narrative: RADAR VECTORED TO ILS 24 AT ISP. APCH NOTIFIED US WE HAD LOW ALT ALERT. WE WERE AT 1440 FT AND SHOULD HAVE BEEN AT 1800 FT. WE RESET OUR ALTIMETER TO PRESENT SETTING AND RECAPTURE GS. I WAS IN R SEAT AND PLT OF RECORD IFR FLT PLAN WAS FILED WITH ME AS PLT. PRESSURIZED WAS OUR COMPANY ACFT. PLT IN L SEAT WAS IFR RATED.

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.