B757-200 crew had altitude overshoot in iad class east.

Attributes
ACN	525488
Time
Date	200109
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi.airport
Altitude	msl bound lower : 11000 msl bound upper : 11400
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm Rain
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 170 flight time total : 4800 flight time type : 1600
ASRS Report	525488
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather inflight encounter other non adherence : company policies non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	aircraft equipment : altitude alert other flight crewa other flight crewb
Resolutory Action	flight crew : overrode automation flight crew : returned to assigned altitude
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After leaving bwi, we were being vectored around in area to try to avoid thunderstorm cells. We were given 11000 ft as altitude clearance. We programmed our plane by putting 11000 ft in the altitude window. We were in VNAV. As plane climbed through about 8000 ft, 'altitude capture' appeared in the ADI. At 11000 ft the VNAV went to 'altitude hold' and the mode control panel went to 'hold,' but the aircraft flight director continued with a climb and the power did not come back for level flight. The plane was being hand flown and we continued to 11400 ft before it was recognized and hand flown back down to 11000 ft. The autoplts also started a climb when engaged. In order to correct, we went to vertical speed, then back to VNAV and the problem corrected itself. ATC did not question or mention our 400 ft violation.

Original NASA ASRS Text

Title: B757-200 CREW HAD ALT OVERSHOOT IN IAD CLASS E.

Narrative: AFTER LEAVING BWI, WE WERE BEING VECTORED AROUND IN AREA TO TRY TO AVOID TSTM CELLS. WE WERE GIVEN 11000 FT AS ALT CLRNC. WE PROGRAMMED OUR PLANE BY PUTTING 11000 FT IN THE ALT WINDOW. WE WERE IN VNAV. AS PLANE CLBED THROUGH ABOUT 8000 FT, 'ALT CAPTURE' APPEARED IN THE ADI. AT 11000 FT THE VNAV WENT TO 'ALT HOLD' AND THE MODE CTL PANEL WENT TO 'HOLD,' BUT THE ACFT FLT DIRECTOR CONTINUED WITH A CLB AND THE PWR DID NOT COME BACK FOR LEVEL FLT. THE PLANE WAS BEING HAND FLOWN AND WE CONTINUED TO 11400 FT BEFORE IT WAS RECOGNIZED AND HAND FLOWN BACK DOWN TO 11000 FT. THE AUTOPLTS ALSO STARTED A CLB WHEN ENGAGED. IN ORDER TO CORRECT, WE WENT TO VERT SPD, THEN BACK TO VNAV AND THE PROB CORRECTED ITSELF. ATC DID NOT QUESTION OR MENTION OUR 400 FT VIOLATION.

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.