Non adherence to ATC clearance instruction regarding an altitude crossing restr. Flight crew clearance interpretation thought altitude crossing restr canceled account turn had been given.

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Attributes
ACN	353200
Time
Date	199611
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : swl
State Reference	MD
Altitude	msl bound lower : 18700 msl bound upper : 19000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc tower : cle
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : direct enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 240 flight time total : 18000 flight time type : 12000
ASRS Report	353200
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 210 flight time total : 9000 flight time type : 5500
ASRS Report	353201
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Center gave clearance to cross zizzy intersection at FL190 to maintain FL180. At FL187 center asked our altitude and we replied FL187. They said to maintain FL190 since we hadn't reached zizzy intersection yet. We complied and they reclred us to FL180. During all of this, center gave us a turn to heading 270 degrees. I can't exactly recall if the heading was given prior to or after the descent. If given after, this would negate the altitude crossing restr.

Original NASA ASRS Text

Title: NON ADHERENCE TO ATC CLRNC INSTRUCTION REGARDING AN ALT XING RESTR. FLC CLRNC INTERP THOUGHT ALT XING RESTR CANCELED ACCOUNT TURN HAD BEEN GIVEN.

Narrative: CTR GAVE CLRNC TO CROSS ZIZZY INTXN AT FL190 TO MAINTAIN FL180. AT FL187 CTR ASKED OUR ALT AND WE REPLIED FL187. THEY SAID TO MAINTAIN FL190 SINCE WE HADN'T REACHED ZIZZY INTXN YET. WE COMPLIED AND THEY RECLRED US TO FL180. DURING ALL OF THIS, CTR GAVE US A TURN TO HDG 270 DEGS. I CAN'T EXACTLY RECALL IF THE HDG WAS GIVEN PRIOR TO OR AFTER THE DSCNT. IF GIVEN AFTER, THIS WOULD NEGATE THE ALT XING RESTR.

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.