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Non specific instructions from atl tower controller cause 2 aircraft to react and both aircraft receive TCASII RA's.
| Attributes | |
| ACN | 451958 |
| Time | |
| Date | 199910 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | agl single value : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : atl.tower tower : lax.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : vacating altitude climbout : initial landing : missed approach |
| Route In Use | departure : noise abatement departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : atl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial climbout : vacating altitude |
| Route In Use | departure : noise abatement departure : on vectors departure : other published ifr departure |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6500 flight time type : 1500 |
| ASRS Report | 451958 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : far |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Supplementary | |
| Problem Areas | Airspace Structure Airport ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Aircraft #1 was performing a missed approach on runway 28 and was given turn to 180 degrees and climb to 3500 ft. Prior to initiation of turn, tower issued instruction 'aircraft on departure maintain runway heading.' aircraft #1 maintained and acknowledged 'runway heading' instruction. Instruction apparently was intended for aircraft #2 which was on takeoff from parallel runway 27R. Both aircraft received RA warnings. Aircraft #1 turned left to 180 degrees after visual acquisition of intruding aircraft.
Original NASA ASRS Text
Title: NON SPECIFIC INSTRUCTIONS FROM ATL TWR CTLR CAUSE 2 ACFT TO REACT AND BOTH ACFT RECEIVE TCASII RA'S.
Narrative: ACFT #1 WAS PERFORMING A MISSED APCH ON RWY 28 AND WAS GIVEN TURN TO 180 DEGS AND CLB TO 3500 FT. PRIOR TO INITIATION OF TURN, TWR ISSUED INSTRUCTION 'ACFT ON DEP MAINTAIN RWY HDG.' ACFT #1 MAINTAINED AND ACKNOWLEDGED 'RWY HDG' INSTRUCTION. INSTRUCTION APPARENTLY WAS INTENDED FOR ACFT #2 WHICH WAS ON TKOF FROM PARALLEL RWY 27R. BOTH ACFT RECEIVED RA WARNINGS. ACFT #1 TURNED L TO 180 DEGS AFTER VISUAL ACQUISITION OF INTRUDING ACFT.
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.