Medium large transport overshoots leveloff altitude at jst.

Attributes
ACN	454850
Time
Date	199911
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : jst.vortac
State Reference	PA
Altitude	msl bound lower : 31000 msl bound upper : 31220
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	cruise other landing : roll
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6500 flight time type : 1200
ASRS Report	454850
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : altimeter other flight crewa other flight crewb other other : 4
Resolutory Action	flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During en route climb from FL290, aircraft was cleared to FL300 but crew requested FL310 instead, and were cleared to FL310. Approaching FL310, captain (flying the aircraft) used autoplt to initiate leveloff, noted aircraft beginning to slow climb rate and put autoplt in altitude hold and turned to talk to first officer about next navigation point. 1 min or 2 later, FAA asi on jump seat stated check altitude. The aircraft was 200-220 ft high. Captain immediately descended to and leveled at FL310. No altitude alerter sounded and no calls received from center. When engaging altitude hold autoplt had continued a 100-200 FPM climb rather than leveling off. No further deviations were noted. Upon landing, FAA asi recommended filing NASA report in event center radar alerted to altitude deviation. Conditions leading to incident were late time of day after long duty period, new first officer and relatively new captain on 4TH leg of the day.

Original NASA ASRS Text

Title: MLG OVERSHOOTS LEVELOFF ALT AT JST.

Narrative: DURING ENRTE CLB FROM FL290, ACFT WAS CLRED TO FL300 BUT CREW REQUESTED FL310 INSTEAD, AND WERE CLRED TO FL310. APCHING FL310, CAPT (FLYING THE ACFT) USED AUTOPLT TO INITIATE LEVELOFF, NOTED ACFT BEGINNING TO SLOW CLB RATE AND PUT AUTOPLT IN ALT HOLD AND TURNED TO TALK TO FO ABOUT NEXT NAV POINT. 1 MIN OR 2 LATER, FAA ASI ON JUMP SEAT STATED CHK ALT. THE ACFT WAS 200-220 FT HIGH. CAPT IMMEDIATELY DSNDED TO AND LEVELED AT FL310. NO ALT ALERTER SOUNDED AND NO CALLS RECEIVED FROM CTR. WHEN ENGAGING ALT HOLD AUTOPLT HAD CONTINUED A 100-200 FPM CLB RATHER THAN LEVELING OFF. NO FURTHER DEVS WERE NOTED. UPON LNDG, FAA ASI RECOMMENDED FILING NASA RPT IN EVENT CTR RADAR ALERTED TO ALTDEV. CONDITIONS LEADING TO INCIDENT WERE LATE TIME OF DAY AFTER LONG DUTY PERIOD, NEW FO AND RELATIVELY NEW CAPT ON 4TH LEG OF THE DAY.

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.