Air carrier large transport altitude deviation overshot in thunderstorm activity.

Attributes
ACN	188771
Time
Date	199109
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bae
State Reference	WI
Altitude	msl bound lower : 20000 msl bound upper : 20700
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 7000 flight time type : 3080
ASRS Report	188771
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 18000 flight time type : 11000
ASRS Report	188755
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed mke with trw's and rainshowers to the south, west and east. Took off to the north and climbed out over lake michigan on a north easterly heading (about 060 degree). Between lines of thunderstorms on each side of us. Cleared to FL190 by chicago center; then cleared to FL200. We were making minor heading changes to avoid smaller buildups when we entered moderate plus turbulence at the same time we were leveling at FL200. We overshot the altitude by 700 ft (20700) before getting it stopped and back down to 20000 ft. At the same time center cleared us to FL220, and then said no to go back down to previous clearance of FL200 and said to us that we were at 20700 ft. We told him about the turbulence and WX problems. Because of the moderate to severe turbulence we overshot our altitude assignment by 700 ft. Frequency congestion, WX deviations and confusion added to the problem. Supplemental information from acn 188755. We had TCAS, no RA and it took 1 1/2 min before traffic came onto TCAS.

Original NASA ASRS Text

Title: ACR LGT ALT DEV OVERSHOT IN TSTM ACTIVITY.

Narrative: DEPARTED MKE WITH TRW'S AND RAINSHOWERS TO THE S, W AND E. TOOK OFF TO THE N AND CLBED OUT OVER LAKE MICHIGAN ON A N EASTERLY HDG (ABOUT 060 DEG). BTWN LINES OF TSTMS ON EACH SIDE OF US. CLRED TO FL190 BY CHICAGO CENTER; THEN CLRED TO FL200. WE WERE MAKING MINOR HDG CHANGES TO AVOID SMALLER BUILDUPS WHEN WE ENTERED MODERATE PLUS TURB AT THE SAME TIME WE WERE LEVELING AT FL200. WE OVERSHOT THE ALT BY 700 FT (20700) BEFORE GETTING IT STOPPED AND BACK DOWN TO 20000 FT. AT THE SAME TIME CENTER CLRED US TO FL220, AND THEN SAID NO TO GO BACK DOWN TO PREVIOUS CLRNC OF FL200 AND SAID TO US THAT WE WERE AT 20700 FT. WE TOLD HIM ABOUT THE TURB AND WX PROBLEMS. BECAUSE OF THE MODERATE TO SEVERE TURB WE OVERSHOT OUR ALT ASSIGNMENT BY 700 FT. FREQ CONGESTION, WX DEVS AND CONFUSION ADDED TO THE PROBLEM. SUPPLEMENTAL INFO FROM ACN 188755. WE HAD TCAS, NO RA AND IT TOOK 1 1/2 MIN BEFORE TFC CAME ONTO TCAS.

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.