H125B hawker flight crew has an altitude deviation on approach to teb.

Attributes
ACN	689769
Time
Date	200603
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : teb.airport
State Reference	NJ
Altitude	msl bound lower : 5750 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	British Aerospace Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 85 flight time total : 6700 flight time type : 150
ASRS Report	689769
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 14000 flight time type : 350
ASRS Report	689775
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : alt alerter other controllerb other flight crewa other flight crewb
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 Aircraft
Primary Problem	Aircraft

Narrative:

I was cleared to descend down to 6000 ft. At 7000 ft both the pilots called 1000 ft to go; and I said 'set and selected.' at 6000 ft with 1000 FPM descent showing on the vertical speed indicator and an altitude capture showing on the pfd; I became aware that the altitude hold was not going to work. At 5850 ft I took corrective action and returned the aircraft to the assigned altitude of 6000 ft. The aircraft went as low as about 5750 ft before returning to 6000 ft. ZNY called and gave altimeter setting and said check altitude. Supplemental information from acn 689775: first officer found an estimated 40 pounds of force was required to be needed to level off the aircraft.

Original NASA ASRS Text

Title: H125B HAWKER FLT CREW HAS AN ALTDEV ON APCH TO TEB.

Narrative: I WAS CLRED TO DSND DOWN TO 6000 FT. AT 7000 FT BOTH THE PLTS CALLED 1000 FT TO GO; AND I SAID 'SET AND SELECTED.' AT 6000 FT WITH 1000 FPM DSCNT SHOWING ON THE VERT SPD INDICATOR AND AN ALT CAPTURE SHOWING ON THE PFD; I BECAME AWARE THAT THE ALT HOLD WAS NOT GOING TO WORK. AT 5850 FT I TOOK CORRECTIVE ACTION AND RETURNED THE ACFT TO THE ASSIGNED ALT OF 6000 FT. THE ACFT WENT AS LOW AS ABOUT 5750 FT BEFORE RETURNING TO 6000 FT. ZNY CALLED AND GAVE ALTIMETER SETTING AND SAID CHK ALT. SUPPLEMENTAL INFO FROM ACN 689775: FO FOUND AN ESTIMATED 40 LBS OF FORCE WAS REQUIRED TO BE NEEDED TO LEVEL OFF THE ACFT.

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.