During descent through 5500 ft to 4000 ft, the flight crew of a B727 was informed that they were only cleared to 6000 ft. The B727 flight crew returned to 6000 ft. Altitude deviation altitude overshot.

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Attributes
ACN	321227
Time
Date	199511
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 5500 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent 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 : 80 flight time total : 13000 flight time type : 3000
ASRS Report	321227
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 18000 flight time type : 15000
ASRS Report	321570
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	other controllera
Resolutory Action	other other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Started extol 2 arrival to lga at ign. On vectors past basye cleared from 8000 ft MSL to 4000 ft MSL. At about 5500 ft MSL, controller asked us if we were maintaining 6000 ft MSL. We replied we were cleared to 4000 ft, but returned to 6000 ft. Supplemental information from acn 321570: during extensive vectoring for approach we were cleared to descend to 4000 ft. I read back 4000 ft and the first officer set 4000 ft in the altitude alerter.

Original NASA ASRS Text

Title: DURING DSCNT THROUGH 5500 FT TO 4000 FT, THE FLC OF A B727 WAS INFORMED THAT THEY WERE ONLY CLRED TO 6000 FT. THE B727 FLC RETURNED TO 6000 FT. ALTDEV ALT OVERSHOT.

Narrative: STARTED EXTOL 2 ARR TO LGA AT IGN. ON VECTORS PAST BASYE CLRED FROM 8000 FT MSL TO 4000 FT MSL. AT ABOUT 5500 FT MSL, CTLR ASKED US IF WE WERE MAINTAINING 6000 FT MSL. WE REPLIED WE WERE CLRED TO 4000 FT, BUT RETURNED TO 6000 FT. SUPPLEMENTAL INFO FROM ACN 321570: DURING EXTENSIVE VECTORING FOR APCH WE WERE CLRED TO DSND TO 4000 FT. I READ BACK 4000 FT AND THE FO SET 4000 FT IN THE ALT ALERTER.

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.