<< >> NASA ASRS Report 532646, December 2001

B737-700 crew had an altitude overshoot after the flight guidance was given a pitch input near the leveloff altitude.

Attributes
ACN	532646
Time
Date	200112
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : cgi.vor
State Reference	MO
Altitude	msl bound lower : 26000 msl bound upper : 27000
Environment
Flight Conditions	VMC VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	descent : approach
Route In Use	arrival star : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 400 flight time total : 17000 flight time type : 13000
ASRS Report	532646
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot non adherence : company policies non adherence : published procedure other anomaly other
Independent Detector	atc equipment other atc equipment : radar other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Controller asked to slow and turn said 'cross cgi at FL270.' I pushed over to make restr and autoplt did not autolevel. Autoplt was disconnected and aircraft manually leveled at FL270. Overshot altitude some and missed restr slightly. This is first time in dash 700 series aircraft. I noted autoplt FMS system unable to handle situation of pushing over close to altitude of leveloff. B737-300/500 autoplts handle just fine. First officer reported he had observed 700 series less capable of pitch changes near leveloff. It appears dash 700 autoplt software less capable of slow, pitchover, autolevel/altitude acquire changes near altitude which is set in altitude alert box on FMC/MCP. In future, will not try to accommodate controller last min as I can in B737-300/500 series.

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Original NASA ASRS Text

Title: B737-700 CREW HAD AN ALT OVERSHOOT AFTER THE FLT GUIDANCE WAS GIVEN A PITCH INPUT NEAR THE LEVELOFF ALT.

Narrative: CTLR ASKED TO SLOW AND TURN SAID 'CROSS CGI AT FL270.' I PUSHED OVER TO MAKE RESTR AND AUTOPLT DID NOT AUTOLEVEL. AUTOPLT WAS DISCONNECTED AND ACFT MANUALLY LEVELED AT FL270. OVERSHOT ALT SOME AND MISSED RESTR SLIGHTLY. THIS IS FIRST TIME IN DASH 700 SERIES ACFT. I NOTED AUTOPLT FMS SYS UNABLE TO HANDLE SIT OF PUSHING OVER CLOSE TO ALT OF LEVELOFF. B737-300/500 AUTOPLTS HANDLE JUST FINE. FO RPTED HE HAD OBSERVED 700 SERIES LESS CAPABLE OF PITCH CHANGES NEAR LEVELOFF. IT APPEARS DASH 700 AUTOPLT SOFTWARE LESS CAPABLE OF SLOW, PITCHOVER, AUTOLEVEL/ALT ACQUIRE CHANGES NEAR ALT WHICH IS SET IN ALT ALERT BOX ON FMC/MCP. IN FUTURE, WILL NOT TRY TO ACCOMMODATE CTLR LAST MIN AS I CAN IN B737-300/500 SERIES.

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.