 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Aircraft a and aircraft B on converging courses with 1000 ft altitude separation. Reporter approves a request by aircraft a to deviate around WX followed by a clearance to a fix and a maintain altitude which is the same as aircraft B's altitude. An unidentifiable acknowledgement is received and no further action is taken. This results in a loss of standard separation.
| Attributes | |
| ACN | 276713 |
| Time | |
| Date | 199406 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : yng |
| State Reference | OH |
| Altitude | msl bound lower : 17000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zob |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 276713 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 19500 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft a, eastbound at 17000 ft. Aircraft B, northbound, climbing to FL220. Aircraft B stopped at 16000 ft because of aircraft a. Few mins later, aircraft B asked to deviate due to WX. Aircraft B was instructed to deviate as necessary and proceed direct svm, and to maintain 17000 ft. Pilot simply said 'roger.' no call sign, no altitude readback, just 'roger.' this took away a vital 'second chance' to assure a proper altitude assignment.
Original NASA ASRS Text
Title: ACFT A AND ACFT B ON CONVERGING COURSES WITH 1000 FT ALT SEPARATION. RPTR APPROVES A REQUEST BY ACFT A TO DEVIATE AROUND WX FOLLOWED BY A CLRNC TO A FIX AND A MAINTAIN ALT WHICH IS THE SAME AS ACFT B'S ALT. AN UNIDENTIFIABLE ACKNOWLEDGEMENT IS RECEIVED AND NO FURTHER ACTION IS TAKEN. THIS RESULTS IN A LOSS OF STANDARD SEPARATION.
Narrative: ACFT A, EBOUND AT 17000 FT. ACFT B, NBOUND, CLBING TO FL220. ACFT B STOPPED AT 16000 FT BECAUSE OF ACFT A. FEW MINS LATER, ACFT B ASKED TO DEVIATE DUE TO WX. ACFT B WAS INSTRUCTED TO DEVIATE AS NECESSARY AND PROCEED DIRECT SVM, AND TO MAINTAIN 17000 FT. PLT SIMPLY SAID 'ROGER.' NO CALL SIGN, NO ALT READBACK, JUST 'ROGER.' THIS TOOK AWAY A VITAL 'SECOND CHANCE' TO ASSURE A PROPER ALT ASSIGNMENT.
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.