A cpr jet overshot its altitude in descent.

Attributes
ACN	414650
Time
Date	199809
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp
State Reference	NY
Altitude	msl bound lower : 2300 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 4000 flight time type : 250
ASRS Report	414650
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on descent for landing at isp, ATC (new york approach) cleared us to descend to 3000 ft MSL. During a heading change, I looked up to see that we were descending through 2600 ft MSL. I immediately told the PF to check altitude. He climbed promptly back to 3000 ft. At our lowest, we were at 2300 ft MSL. ATC made no mention and TCASII showed no conflicts. I simply did not monitor the captain properly.

Original NASA ASRS Text

Title: A CPR JET OVERSHOT ITS ALT IN DSCNT.

Narrative: WHILE ON DSCNT FOR LNDG AT ISP, ATC (NEW YORK APCH) CLRED US TO DSND TO 3000 FT MSL. DURING A HDG CHANGE, I LOOKED UP TO SEE THAT WE WERE DSNDING THROUGH 2600 FT MSL. I IMMEDIATELY TOLD THE PF TO CHK ALT. HE CLBED PROMPTLY BACK TO 3000 FT. AT OUR LOWEST, WE WERE AT 2300 FT MSL. ATC MADE NO MENTION AND TCASII SHOWED NO CONFLICTS. I SIMPLY DID NOT MONITOR THE CAPT PROPERLY.

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.