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Phl tower controller experienced operational error when landing aircraft agrees to exit runway; takeoff clearance was issued and landing aircraft missed turn.
| Attributes | |
| ACN | 649137 |
| Time | |
| Date | 200503 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : phl.airport |
| State Reference | PA |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | Marginal |
| Weather Elements | Snow |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-8 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | landing : roll |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : phl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : ground critical non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : amass other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 3000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
DC8 landing roll; B737 position and hold. DC8 asked if it could turn right at next taxiway. DC8 pilot replied; 'affirmative.' controller observed DC8 starting to turn right. Controller cleared B737 for takeoff. DC8 pilot replied he was still on runway. Controller instructed DC8 to taxi without delay -- amass alarmed. In short; the controller based the takeoff clearance for the B737 from the DC8 affirmative reply that it could exit at the next taxiway; and observing the DC8 starting to turn right off the runway. What the controller didn't observe was the DC8 turning back onto the runway. If the pilot had verbally alerted the controller that it would be unable to exit the runway after it initiated a turn; [this problem could have been avoided].
Original NASA ASRS Text
Title: PHL TWR CTLR EXPERIENCED OPERROR WHEN LNDG ACFT AGREES TO EXIT RWY; TKOF CLRNC WAS ISSUED AND LNDG ACFT MISSED TURN.
Narrative: DC8 LNDG ROLL; B737 POS AND HOLD. DC8 ASKED IF IT COULD TURN R AT NEXT TXWY. DC8 PLT REPLIED; 'AFFIRMATIVE.' CTLR OBSERVED DC8 STARTING TO TURN R. CTLR CLRED B737 FOR TKOF. DC8 PLT REPLIED HE WAS STILL ON RWY. CTLR INSTRUCTED DC8 TO TAXI WITHOUT DELAY -- AMASS ALARMED. IN SHORT; THE CTLR BASED THE TKOF CLRNC FOR THE B737 FROM THE DC8 AFFIRMATIVE REPLY THAT IT COULD EXIT AT THE NEXT TXWY; AND OBSERVING THE DC8 STARTING TO TURN R OFF THE RWY. WHAT THE CTLR DIDN'T OBSERVE WAS THE DC8 TURNING BACK ONTO THE RWY. IF THE PLT HAD VERBALLY ALERTED THE CTLR THAT IT WOULD BE UNABLE TO EXIT THE RWY AFTER IT INITIATED A TURN; [THIS PROB COULD HAVE BEEN AVOIDED].
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.