<< >> NASA ASRS Report 470893, April 2000

ATCT local controller asked flight crew of a cpr cessna citation if they wanted to waive the required hold for wake turbulence at a runway intersection after a departing lear jet. They did and took off.

Attributes
ACN	470893
Time
Date	200004
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mgm.airport
State Reference	AL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	other
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : mgm.tower
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff ground : position and hold
Person 1
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : non radar
Experience	controller time certified in position1 : 0.4 flight time total : 100
ASRS Report	470893
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	non adherence : required legal separation
Independent Detector	other controllera other flight crewa other other : no 1
Resolutory Action	controller : issued advisory none taken : anomaly accepted
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

This event seems like a non event. Degree divergence was established and proper separation minima can be proved with an investigation. These 2 aircraft got close on departure and one was on a practice approach. But, with a heads up attitude, the radar controller established good separation. Where the problem arises in this incident was on departure of the citation. He was a small departing from an intersection with a wake turbulence hold behind a small plus on a touch-and-go. I witnessed the local controller solicit a wake turbulence waiver from an intersection, after informing the pilot at that position there was a hold.

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Original NASA ASRS Text

Title: ATCT LCL CTLR ASKED FLC OF A CPR CESSNA CITATION IF THEY WANTED TO WAIVE THE REQUIRED HOLD FOR WAKE TURB AT A RWY INTXN AFTER A DEPARTING LEAR JET. THEY DID AND TOOK OFF.

Narrative: THIS EVENT SEEMS LIKE A NON EVENT. DEG DIVERGENCE WAS ESTABLISHED AND PROPER SEPARATION MINIMA CAN BE PROVED WITH AN INVESTIGATION. THESE 2 ACFT GOT CLOSE ON DEP AND ONE WAS ON A PRACTICE APCH. BUT, WITH A HEADS UP ATTITUDE, THE RADAR CTLR ESTABLISHED GOOD SEPARATION. WHERE THE PROB ARISES IN THIS INCIDENT WAS ON DEP OF THE CITATION. HE WAS A SMALL DEPARTING FROM AN INTXN WITH A WAKE TURB HOLD BEHIND A SMALL PLUS ON A TOUCH-AND-GO. I WITNESSED THE LCL CTLR SOLICIT A WAKE TURB WAIVER FROM AN INTXN, AFTER INFORMING THE PLT AT THAT POS THERE WAS A HOLD.

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.