<< >> NASA ASRS Report 321451, November 1995

A B737 flight crew failed to level at assigned altitude during descent. Altitude deviation altitude overshot. ATC assigned interim altitude late.

Attributes
ACN	321451
Time
Date	199511
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : oxi
State Reference	IN
Altitude	msl bound lower : 17500 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zau
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 6000 flight time type : 1800
ASRS Report	321451
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 40 flight time total : 8000 flight time type : 3000
ASRS Report	321600
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Center gave us airspeed of 320 KTS or greater. Descending to 17000 ft MSL, at 4000 FPM. At FL183 center amended altitude to maintain FL180. At our current rate of descent and airspeed we went to 17500 ft MSL before being able to recover back to FL180. Center asked if we were maintaining FL180 and at the time of the asking we were at FL180 again. Supplemental information from acn 321600: while descending into ord in our B737, at approximately FL180 controller asked us to level 'right there.' more time would have been nice.

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Original NASA ASRS Text

Title: A B737 FLC FAILED TO LEVEL AT ASSIGNED ALT DURING DSCNT. ALTDEV ALT OVERSHOT. ATC ASSIGNED INTERIM ALT LATE.

Narrative: CTR GAVE US AIRSPD OF 320 KTS OR GREATER. DSNDING TO 17000 FT MSL, AT 4000 FPM. AT FL183 CTR AMENDED ALT TO MAINTAIN FL180. AT OUR CURRENT RATE OF DSCNT AND AIRSPD WE WENT TO 17500 FT MSL BEFORE BEING ABLE TO RECOVER BACK TO FL180. CTR ASKED IF WE WERE MAINTAINING FL180 AND AT THE TIME OF THE ASKING WE WERE AT FL180 AGAIN. SUPPLEMENTAL INFO FROM ACN 321600: WHILE DSNDING INTO ORD IN OUR B737, AT APPROX FL180 CTLR ASKED US TO LEVEL 'RIGHT THERE.' MORE TIME WOULD HAVE BEEN NICE.

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.