Altitude deviation altitude overshot. Cftt.

Attributes
ACN	295185
Time
Date	199501
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rdu
State Reference	NC
Altitude	msl bound lower : 1600 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : rdu
Operator	common carrier : air taxi
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6350 flight time type : 1100
ASRS Report	295185
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : regained aircraft control 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:

At rdu we were vectored onto the runway 23L localizer and were told to maintain 2000 ft until established. I was the PNF. After getting the airplane established on the localizer and 2000 ft set in the altitude alert and confirmed by both crew members. I called 1000 ft to go and monitored the descent. When I saw the PF initiate a leveloff I looked away from the altimeter to the conditions outside. I was looking at the wing to check how much ice had accumulated during our flight and to consider using partial flaps for landing. I heard the altitude alert sound. The aircraft had descended to 1750 ft. I took the yoke to stop the descent and started a climb and returned the control to the PF. Just when I stopped the descent the controller called our altitude of 1600 ft. We climbed to 2000 ft and continued the approach.

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT. CFTT.

Narrative: AT RDU WE WERE VECTORED ONTO THE RWY 23L LOC AND WERE TOLD TO MAINTAIN 2000 FT UNTIL ESTABLISHED. I WAS THE PNF. AFTER GETTING THE AIRPLANE ESTABLISHED ON THE LOC AND 2000 FT SET IN THE ALT ALERT AND CONFIRMED BY BOTH CREW MEMBERS. I CALLED 1000 FT TO GO AND MONITORED THE DSCNT. WHEN I SAW THE PF INITIATE A LEVELOFF I LOOKED AWAY FROM THE ALTIMETER TO THE CONDITIONS OUTSIDE. I WAS LOOKING AT THE WING TO CHK HOW MUCH ICE HAD ACCUMULATED DURING OUR FLT AND TO CONSIDER USING PARTIAL FLAPS FOR LNDG. I HEARD THE ALT ALERT SOUND. THE ACFT HAD DSNDED TO 1750 FT. I TOOK THE YOKE TO STOP THE DSCNT AND STARTED A CLB AND RETURNED THE CTL TO THE PF. JUST WHEN I STOPPED THE DSCNT THE CTLR CALLED OUR ALT OF 1600 FT. WE CLBED TO 2000 FT AND CONTINUED THE APCH.

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.