<< >> NASA ASRS Report 395330, February 1998

A B757-200 descending in ZTL, GA, misses a crossing restr. ARTCC intervenes by giving a new clearance.

Attributes
ACN	395330
Time
Date	199802
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lgc
State Reference	GA
Altitude	msl bound lower : 29000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl tower : pfn
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 200
ASRS Report	395330
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Controller cleared us to cross 70 NM southwest of lgc VORTAC at FL290. We entered the waypoint constraint into the FMS at a fix we believed was 71 NM southwest of lgc. Controller later queried us about our descent and we expedited down to FL290. There was no traffic conflict. Reviewing our actions we determined that our waypoint constraint should have been at mgm VORTAC, which was approximately 75 NM southwest of lgc. Since there were three fixes between our position when we got our clearance, perhaps it would have been better to reference the crossing restr off the closest one.

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Original NASA ASRS Text

Title: A B757-200 DSNDING IN ZTL, GA, MISSES A XING RESTR. ARTCC INTERVENES BY GIVING A NEW CLRNC.

Narrative: CTLR CLRED US TO CROSS 70 NM SW OF LGC VORTAC AT FL290. WE ENTERED THE WAYPOINT CONSTRAINT INTO THE FMS AT A FIX WE BELIEVED WAS 71 NM SW OF LGC. CTLR LATER QUERIED US ABOUT OUR DSCNT AND WE EXPEDITED DOWN TO FL290. THERE WAS NO TFC CONFLICT. REVIEWING OUR ACTIONS WE DETERMINED THAT OUR WAYPOINT CONSTRAINT SHOULD HAVE BEEN AT MGM VORTAC, WHICH WAS APPROX 75 NM SW OF LGC. SINCE THERE WERE THREE FIXES BTWN OUR POS WHEN WE GOT OUR CLRNC, PERHAPS IT WOULD HAVE BEEN BETTER TO REF THE XING RESTR OFF THE CLOSEST ONE.

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.