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A BA3100 flight crew is denied, by ATC, the altitude needed for driftdown compliance while approaching gmn, ca.
| Attributes | |
| ACN | 416188 |
| Time | |
| Date | 199810 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gmn |
| State Reference | CA |
| Altitude | msl bound lower : 13000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 31 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 240 flight time total : 4200 flight time type : 1900 |
| ASRS Report | 416188 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : far non adherence other other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
During climb out, realized that reaching minimum driftdown altitude may be in question by critical point which was gmn VOR. Queried ATC 3 times for higher altitude. Each time was told would be given higher when able. Finally advised ATC if minimum altitude of 14000 ft was not reached by gmn that I would have to initiate a 360 degree turn for the climb. After being told this controller advised that 'driftdown' has no meaning to him and gave me a climb to 13000 ft. Knowing traffic was behind, I decided to continue to avoid turning directly back into traffic and also having departed below the aircraft's maximum takeoff weight for driftdown to be used, I knew I could meet the required performance. Upon arriving at the destination, I called ATC on the phone to explain driftdown requirements and supervising controller stated that they were aware of them. However, due to unavoidable traffic situation, they could not issue an altitude change.
Original NASA ASRS Text
Title: A BA3100 FLC IS DENIED, BY ATC, THE ALT NEEDED FOR DRIFTDOWN COMPLIANCE WHILE APCHING GMN, CA.
Narrative: DURING CLBOUT, REALIZED THAT REACHING MINIMUM DRIFTDOWN ALT MAY BE IN QUESTION BY CRITICAL POINT WHICH WAS GMN VOR. QUERIED ATC 3 TIMES FOR HIGHER ALT. EACH TIME WAS TOLD WOULD BE GIVEN HIGHER WHEN ABLE. FINALLY ADVISED ATC IF MINIMUM ALT OF 14000 FT WAS NOT REACHED BY GMN THAT I WOULD HAVE TO INITIATE A 360 DEG TURN FOR THE CLB. AFTER BEING TOLD THIS CTLR ADVISED THAT 'DRIFTDOWN' HAS NO MEANING TO HIM AND GAVE ME A CLB TO 13000 FT. KNOWING TFC WAS BEHIND, I DECIDED TO CONTINUE TO AVOID TURNING DIRECTLY BACK INTO TFC AND ALSO HAVING DEPARTED BELOW THE ACFT'S MAX TKOF WT FOR DRIFTDOWN TO BE USED, I KNEW I COULD MEET THE REQUIRED PERFORMANCE. UPON ARRIVING AT THE DEST, I CALLED ATC ON THE PHONE TO EXPLAIN DRIFTDOWN REQUIREMENTS AND SUPERVISING CTLR STATED THAT THEY WERE AWARE OF THEM. HOWEVER, DUE TO UNAVOIDABLE TFC SIT, THEY COULD NOT ISSUE AN ALT CHANGE.
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.