 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An MD88 flight crew is issued an expedited descent and turn to clear traffic on their arrival procedure to orlando. There had been a mix up in the clearance for an altitude crossing restr on the STAR arrival and a potential conflict ensued.
| Attributes | |
| ACN | 424140 |
| Time | |
| Date | 199812 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : otk |
| State Reference | GA |
| Altitude | msl bound lower : 27000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : bos |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 5500 flight time type : 1500 |
| ASRS Report | 424140 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time total : 12000 flight time type : 1800 |
| ASRS Report | 424845 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met conflict : airborne less severe non adherence : published procedure other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation Operational Deviation |
Narrative:
We were on an assigned heading just south of valdosta, GA, at FL290 when we got clearance to proceed direct to ugene which is a fix on the leese nine arrival for orlando, and cross 15 mi north of ugene at FL270. We then got a frequency change to another ZJX, they didn't answer initially. Then, an animated voice told us to expedite descent to FL270 and turn left to 060 degrees. There appeared to be no traffic conflict. Shortly thereafter we were given clearance to proceed direct to ugene. The controller was very busy. We asked 'what happened back there' and he got back to us in a couple of mins, then said that the other controller should have given us FL270 at clawz. The flight proceeded without incident to orlando. Supplemental information from acn 424845: upon examining the SID and trying to determine exactly what happened I believe the controller meant to have us cross '50' mi north of ugene at FL270. The first controller should have had us cross 'clawz' at FL270 which is in fact 51 mi north of ugene. My suggestion is for the controllers to use clrer verbiage, ie, words 'five zero' for 50 or 'one five' for 15 and this confusion would probably not have happened in the first place.
Original NASA ASRS Text
Title: AN MD88 FLC IS ISSUED AN EXPEDITED DSCNT AND TURN TO CLR TFC ON THEIR ARR PROC TO ORLANDO. THERE HAD BEEN A MIX UP IN THE CLRNC FOR AN ALT XING RESTR ON THE STAR ARR AND A POTENTIAL CONFLICT ENSUED.
Narrative: WE WERE ON AN ASSIGNED HEADING JUST S OF VALDOSTA, GA, AT FL290 WHEN WE GOT CLRNC TO PROCEED DIRECT TO UGENE WHICH IS A FIX ON THE LEESE NINE ARR FOR ORLANDO, AND CROSS 15 MI N OF UGENE AT FL270. WE THEN GOT A FREQ CHANGE TO ANOTHER ZJX, THEY DIDN'T ANSWER INITIALLY. THEN, AN ANIMATED VOICE TOLD US TO EXPEDITE DSCNT TO FL270 AND TURN L TO 060 DEGS. THERE APPEARED TO BE NO TFC CONFLICT. SHORTLY THEREAFTER WE WERE GIVEN CLRNC TO PROCEED DIRECT TO UGENE. THE CTLR WAS VERY BUSY. WE ASKED 'WHAT HAPPENED BACK THERE' AND HE GOT BACK TO US IN A COUPLE OF MINS, THEN SAID THAT THE OTHER CTLR SHOULD HAVE GIVEN US FL270 AT CLAWZ. THE FLT PROCEEDED WITHOUT INCIDENT TO ORLANDO. SUPPLEMENTAL INFO FROM ACN 424845: UPON EXAMINING THE SID AND TRYING TO DETERMINE EXACTLY WHAT HAPPENED I BELIEVE THE CTLR MEANT TO HAVE US CROSS '50' MI N OF UGENE AT FL270. THE FIRST CTLR SHOULD HAVE HAD US CROSS 'CLAWZ' AT FL270 WHICH IS IN FACT 51 MI N OF UGENE. MY SUGGESTION IS FOR THE CTLRS TO USE CLRER VERBIAGE, IE, WORDS 'FIVE ZERO' FOR 50 OR 'ONE FIVE' FOR 15 AND THIS CONFUSION WOULD PROBABLY NOT HAVE HAPPENED IN THE FIRST PLACE.
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.