<< >> NASA ASRS Report 671072, September 2005

M98 arrival and departure controllers experienced operational error at approximately 10000 ft as departure controller misjudged climb rate.

Attributes
ACN	671072
Time
Date	200509
Place
Locale Reference	navaid : dll.vortac
State Reference	WI
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : m98.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	arrival : on vectors departure sid : n/s
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : m98.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival star : bitlr
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : military controller : radar
Experience	controller military : 15 controller radar : 15
ASRS Report	671072
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 18
ASRS Report	671321
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	other controllera other controllerb
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

B757 climbing off msp southeast towards dll. CRJ2 inbound to msp on bitlr arrival level at 10000 ft. I issued the B757 traffic 15 mi from the crj when the B757 was climbing well out of 9000 ft. Shortly after the B757 slowed the climb at about 10000 ft; an immediate climb and turn was issued. The CRJ2 was also issued a descent and turn by another controller. There was no loss of separation. Supplemental information from acn 671321: departure controller climbed B757 out of SID altitude of 7000 ft to 17000 ft on dll's SID. CRJ2 was on a bitlr STAR at 10000 ft. Controller of CRJ2 noticed B757 at 12 O'clock position; 5 mi at 10100 ft and showed level for 2 radar updates. A turn and traffic alert was given to CRJ2. No response. Another advisory and descent was given to CRJ2 and pilot advised traffic in sight and was in the turn. 2 reasons for the event: 1) new SID/STAR procedures right over the top of each other. 2) controller of B757 misjudged climb due to new procedure and the B757 leveled at 10000 ft to speed up.

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Original NASA ASRS Text

Title: M98 ARR AND DEP CTLRS EXPERIENCED OPERROR AT APPROX 10000 FT AS DEP CTLR MISJUDGED CLB RATE.

Narrative: B757 CLBING OFF MSP SE TOWARDS DLL. CRJ2 INBOUND TO MSP ON BITLR ARR LEVEL AT 10000 FT. I ISSUED THE B757 TFC 15 MI FROM THE CRJ WHEN THE B757 WAS CLBING WELL OUT OF 9000 FT. SHORTLY AFTER THE B757 SLOWED THE CLB AT ABOUT 10000 FT; AN IMMEDIATE CLB AND TURN WAS ISSUED. THE CRJ2 WAS ALSO ISSUED A DSCNT AND TURN BY ANOTHER CTLR. THERE WAS NO LOSS OF SEPARATION. SUPPLEMENTAL INFO FROM ACN 671321: DEP CTLR CLBED B757 OUT OF SID ALT OF 7000 FT TO 17000 FT ON DLL'S SID. CRJ2 WAS ON A BITLR STAR AT 10000 FT. CTLR OF CRJ2 NOTICED B757 AT 12 O'CLOCK POS; 5 MI AT 10100 FT AND SHOWED LEVEL FOR 2 RADAR UPDATES. A TURN AND TFC ALERT WAS GIVEN TO CRJ2. NO RESPONSE. ANOTHER ADVISORY AND DSCNT WAS GIVEN TO CRJ2 AND PLT ADVISED TFC IN SIGHT AND WAS IN THE TURN. 2 REASONS FOR THE EVENT: 1) NEW SID/STAR PROCS RIGHT OVER THE TOP OF EACH OTHER. 2) CTLR OF B757 MISJUDGED CLB DUE TO NEW PROC AND THE B757 LEVELED AT 10000 FT TO SPD UP.

Data retrieved from NASA's ASRS site as of January 2009 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.