<< >> NASA ASRS Report 439748, June 1999

2 cpr aircraft are misidented when ZDC controller assigned an altitude assignment for the lead aircraft west of fak, va.

Attributes
ACN	439748
Time
Date	199906
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : fak.vortac
State Reference	VA
Altitude	msl bound lower : 16200 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	other
Make Model Name	Super King Air 200 HDC
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	cruise : enroute altitude change
Route In Use	enroute airway : ns.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	other
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute airway : ns.airway
Person 1
Affiliation	government other
Function	flight crew : captain
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 3000 flight time type : 850
ASRS Report	439748
Person 2
Affiliation	government other
Qualification	pilot : cfi pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 4500
ASRS Report	439759
Events
Anomaly	non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued alert
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance Environmental Factor
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

On jun/xa/99 at approximately XA45, xxy (aircraft I was flying) and sxy were on the same center frequency. We were at assigned altitude of 17000 ft. We were given instructions to descend to 8000 ft. We read back the instructions (controller was very busy) and we proceeded out of 17000 ft for 8000 ft. At approximately 16200 ft the controller told sxy to expedite to 8000 ft and then asked us (xxy) to get back to assigned altitude of 17000 ft. We were given these instructions at approximately 125 mi west of fak. Discussion with crew of sxy. We agreed we were given their instructions by ATC. He was very busy. Supplemental information from acn 439759: company aircraft with similar call sign departed lnp for lyh approximately 15 mins after us. Center was very busy with many aircraft trying to check in. Controller was swamped. ATC assigned us 8000 ft when 25 NM west of lyh. Although this was very early for descent due to high workload on ATC, crew discussed and elected not to question early descent.

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Original NASA ASRS Text

Title: 2 CPR ACFT ARE MISIDENTED WHEN ZDC CTLR ASSIGNED AN ALT ASSIGNMENT FOR THE LEAD ACFT W OF FAK, VA.

Narrative: ON JUN/XA/99 AT APPROX XA45, XXY (ACFT I WAS FLYING) AND SXY WERE ON THE SAME CTR FREQ. WE WERE AT ASSIGNED ALT OF 17000 FT. WE WERE GIVEN INSTRUCTIONS TO DSND TO 8000 FT. WE READ BACK THE INSTRUCTIONS (CTLR WAS VERY BUSY) AND WE PROCEEDED OUT OF 17000 FT FOR 8000 FT. AT APPROX 16200 FT THE CTLR TOLD SXY TO EXPEDITE TO 8000 FT AND THEN ASKED US (XXY) TO GET BACK TO ASSIGNED ALT OF 17000 FT. WE WERE GIVEN THESE INSTRUCTIONS AT APPROX 125 MI W OF FAK. DISCUSSION WITH CREW OF SXY. WE AGREED WE WERE GIVEN THEIR INSTRUCTIONS BY ATC. HE WAS VERY BUSY. SUPPLEMENTAL INFO FROM ACN 439759: COMPANY ACFT WITH SIMILAR CALL SIGN DEPARTED LNP FOR LYH APPROX 15 MINS AFTER US. CTR WAS VERY BUSY WITH MANY ACFT TRYING TO CHK IN. CTLR WAS SWAMPED. ATC ASSIGNED US 8000 FT WHEN 25 NM W OF LYH. ALTHOUGH THIS WAS VERY EARLY FOR DSCNT DUE TO HIGH WORKLOAD ON ATC, CREW DISCUSSED AND ELECTED NOT TO QUESTION EARLY DSCNT.

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.