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A controller observes another controller working local control release a PA31 behind a military heavy aircraft without ensuring 2 min wake turbulence separation.
| Attributes | |
| ACN | 363241 |
| Time | |
| Date | 199703 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : gjt |
| State Reference | CO |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | other |
| Make Model Name | Military Transport |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | PA-31 Navajo Chieftan/Mojave/Navajo T1020 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : non radar pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 1000 |
| ASRS Report | 363241 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
A heavy KE35/right arrived at gjt airport for practice instrument approachs and closed traffic training. The pilot persistently used the call sign and 'heavy' to inform the controller and other pilots operating in the area of the KE35's weight classification. The KE35 lifted off runway 11 from a touch-and-go and approximately 20 seconds later the controller cleared a PA31 for takeoff on the same runway. The 2 min wake turbulence separation minima was not applied. Reference: FAA ATC manual 7110.65J paragraph 3-9-6f1.
Original NASA ASRS Text
Title: A CTLR OBSERVES ANOTHER CTLR WORKING LCL CTL RELEASE A PA31 BEHIND A MIL HVY ACFT WITHOUT ENSURING 2 MIN WAKE TURB SEPARATION.
Narrative: A HVY KE35/R ARRIVED AT GJT ARPT FOR PRACTICE INST APCHS AND CLOSED TFC TRAINING. THE PLT PERSISTENTLY USED THE CALL SIGN AND 'HVY' TO INFORM THE CTLR AND OTHER PLTS OPERATING IN THE AREA OF THE KE35'S WT CLASSIFICATION. THE KE35 LIFTED OFF RWY 11 FROM A TOUCH-AND-GO AND APPROX 20 SECONDS LATER THE CTLR CLRED A PA31 FOR TKOF ON THE SAME RWY. THE 2 MIN WAKE TURB SEPARATION MINIMA WAS NOT APPLIED. REF: FAA ATC MANUAL 7110.65J PARAGRAPH 3-9-6F1.
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.