<< >> NASA ASRS Report 345119, August 1996

Ground controller reports that the local controller did not ensure the wake turbulence separation standards between an L1011 touching down and a DHC8 following on a 3 mi final.

Attributes
ACN	345119
Time
Date	199608
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cle
State Reference	OH
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cle
Operator	common carrier : air carrier
Make Model Name	L-1011 Tri-Star All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach landing other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : ground
Qualification	controller : radar
Experience	controller non radar : 9 controller radar : 8
ASRS Report	345119
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 18000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Local controller had a large jet on final with a heavy L1011 3 mi behind, then a DH8 6 mi back. After first jet crossed the threshold local instructed an MD80 into position runway 23L, expect immediate. Then told the L1011 to slow down as much as possible. Once first jet cleared the runway the MD80 was cleared for takeoff after which the MD80 just barely cleared the departure end of the runway when the L1011 crossed the threshold. By this time the DH8 had closed the gap following the L1011 to 3 mi or less for which heavy wake turbulence separation was not insured by the local controller.

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Original NASA ASRS Text

Title: GND CTLR RPTS THAT THE LCL CTLR DID NOT ENSURE THE WAKE TURB SEPARATION STANDARDS BTWN AN L1011 TOUCHING DOWN AND A DHC8 FOLLOWING ON A 3 MI FINAL.

Narrative: LCL CTLR HAD A LARGE JET ON FINAL WITH A HVY L1011 3 MI BEHIND, THEN A DH8 6 MI BACK. AFTER FIRST JET CROSSED THE THRESHOLD LCL INSTRUCTED AN MD80 INTO POS RWY 23L, EXPECT IMMEDIATE. THEN TOLD THE L1011 TO SLOW DOWN AS MUCH AS POSSIBLE. ONCE FIRST JET CLRED THE RWY THE MD80 WAS CLRED FOR TKOF AFTER WHICH THE MD80 JUST BARELY CLRED THE DEP END OF THE RWY WHEN THE L1011 CROSSED THE THRESHOLD. BY THIS TIME THE DH8 HAD CLOSED THE GAP FOLLOWING THE L1011 TO 3 MI OR LESS FOR WHICH HVY WAKE TURB SEPARATION WAS NOT INSURED BY THE LCL CTLR.

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.