<< >> NASA ASRS Report 331380, March 1996

ATC assigned the flight crew to descend to 10000 ft meaning to assign the flight 11000 ft. There was an aircraft at 10000 ft that set off the TCASII RA. The crew responded and missed the aircraft 700 ft and 3 mi.

Attributes
ACN	331380
Time
Date	199603
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : srq
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tpa tower : sba
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 8700 flight time type : 4000
ASRS Report	331380
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 18000 vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Approach cleared us to 10000 ft. Passing 11000 ft got TCASII TA 'traffic,' followed by RA 'don't descend.' leveled at 10700 ft. P3 passed off left at 100 degrees about 3 mi. Called approach. They thought they had cleared us to 11000 ft. Later discussion suggested they had in fact cleared us to 10000 ft. The old 11000 ft versus 10000 ft problem!

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Original NASA ASRS Text

Title: ATC ASSIGNED THE FLC TO DSND TO 10000 FT MEANING TO ASSIGN THE FLT 11000 FT. THERE WAS AN ACFT AT 10000 FT THAT SET OFF THE TCASII RA. THE CREW RESPONDED AND MISSED THE ACFT 700 FT AND 3 MI.

Narrative: APCH CLRED US TO 10000 FT. PASSING 11000 FT GOT TCASII TA 'TFC,' FOLLOWED BY RA 'DON'T DSND.' LEVELED AT 10700 FT. P3 PASSED OFF L AT 100 DEGS ABOUT 3 MI. CALLED APCH. THEY THOUGHT THEY HAD CLRED US TO 11000 FT. LATER DISCUSSION SUGGESTED THEY HAD IN FACT CLRED US TO 10000 FT. THE OLD 11000 FT VERSUS 10000 FT PROB!

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.