<< >> NASA ASRS Report 211596, June 1992

Flight crew of light transport air carrier aircraft misunderstood that they were cleared to a lower altitude and overshot their clearance altitude resulting in less than standard separation with other traffic.

Attributes
ACN	211596
Time
Date	199206
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : clt
State Reference	NC
Altitude	msl bound lower : 10300 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : ztl
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5700 flight time type : 200
ASRS Report	211596
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time total : 2300 flight time type : 400
ASRS Report	211340
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Inbound to charlotte on the shine arrival the crew received initial clearance to 11000. After leveling off at 11000 the crew received what they believed was another descent clearance to 9000, which is normal for that portion of the arrival. Shortly after beginning the descent, ZTL advised traffic at 2 O'clock maintenance 11000. No evasive action was needed, and the flight proceeded normally. Supplemental information from acn 211340: we were descending to 9000 ft when at 10300 atl called to advise of traffic ahead and to maintain 11000 ft. I said that we were cleared to 9000 ft and atl said to maintain 11000 ft. We climbed to 11000 ft and soon after atl called to say they were pulling the tapes and for us to call ZTL.

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Original NASA ASRS Text

Title: FLC OF LTT AIR CARRIER ACFT MISUNDERSTOOD THAT THEY WERE CLRED TO A LOWER ALT AND OVERSHOT THEIR CLRNC ALT RESULTING IN LTSS WITH OTHER TFC.

Narrative: INBOUND TO CHARLOTTE ON THE SHINE ARR THE CREW RECEIVED INITIAL CLRNC TO 11000. AFTER LEVELING OFF AT 11000 THE CREW RECEIVED WHAT THEY BELIEVED WAS ANOTHER DSCNT CLRNC TO 9000, WHICH IS NORMAL FOR THAT PORTION OF THE ARR. SHORTLY AFTER BEGINNING THE DSCNT, ZTL ADVISED TFC AT 2 O'CLOCK MAINT 11000. NO EVASIVE ACTION WAS NEEDED, AND THE FLT PROCEEDED NORMALLY. SUPPLEMENTAL INFO FROM ACN 211340: WE WERE DSNDING TO 9000 FT WHEN AT 10300 ATL CALLED TO ADVISE OF TFC AHEAD AND TO MAINTAIN 11000 FT. I SAID THAT WE WERE CLRED TO 9000 FT AND ATL SAID TO MAINTAIN 11000 FT. WE CLBED TO 11000 FT AND SOON AFTER ATL CALLED TO SAY THEY WERE PULLING THE TAPES AND FOR US TO CALL ZTL.

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.