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A C182 pilot comes close to creating a potential conflict when he descends his aircraft a lesser rate than ATC had anticipated for crossing traffic in the area.
| Attributes | |
| ACN | 410510 |
| Time | |
| Date | 199808 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bwi |
| State Reference | MD |
| Altitude | msl bound lower : 2400 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bwi |
| Operator | general aviation : personal |
| Make Model Name | Skylane 182/RG Turbo Skylane/RG |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 25 flight time total : 3500 flight time type : 800 |
| ASRS Report | 410510 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : exited adverse environment other |
| Consequence | Other |
| Miss Distance | vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While on vector around bwi, controller gave descent from 3000 ft to 2000 ft. Reported out of 3000 ft and started descending at approximately 500 FPM. At this time, 1 VOR receiver started acting up and distraction my attention to descent rate. Aircraft reduced rate to less than 500 FPM. Controller alerted me at approximately 2400 ft MSL as to how long it took to reach 2000 ft. I immediately increased rate to approximately 800-900 FPM. He asked if I had crossing traffic at 10 O'clock at 3000 ft (distance ?). I did, and he said, maintain visual separation. I was at 2000 ft at this time. There was no conflict to my knowledge. Prevention of possible conflict: PIC -- pay attention to task at hand. Controller -- if altitude change requirement is close time wise for separation, perhaps alert aircraft. Comment: controller made comment that he gave descent instructions 10 NM ago. It was more like 5-6 NM and 10 was an embellishment.
Original NASA ASRS Text
Title: A C182 PLT COMES CLOSE TO CREATING A POTENTIAL CONFLICT WHEN HE DSNDS HIS ACFT A LESSER RATE THAN ATC HAD ANTICIPATED FOR XING TFC IN THE AREA.
Narrative: WHILE ON VECTOR AROUND BWI, CTLR GAVE DSCNT FROM 3000 FT TO 2000 FT. RPTED OUT OF 3000 FT AND STARTED DSNDING AT APPROX 500 FPM. AT THIS TIME, 1 VOR RECEIVER STARTED ACTING UP AND DISTR MY ATTN TO DSCNT RATE. ACFT REDUCED RATE TO LESS THAN 500 FPM. CTLR ALERTED ME AT APPROX 2400 FT MSL AS TO HOW LONG IT TOOK TO REACH 2000 FT. I IMMEDIATELY INCREASED RATE TO APPROX 800-900 FPM. HE ASKED IF I HAD XING TFC AT 10 O'CLOCK AT 3000 FT (DISTANCE ?). I DID, AND HE SAID, MAINTAIN VISUAL SEPARATION. I WAS AT 2000 FT AT THIS TIME. THERE WAS NO CONFLICT TO MY KNOWLEDGE. PREVENTION OF POSSIBLE CONFLICT: PIC -- PAY ATTN TO TASK AT HAND. CTLR -- IF ALT CHANGE REQUIREMENT IS CLOSE TIME WISE FOR SEPARATION, PERHAPS ALERT ACFT. COMMENT: CTLR MADE COMMENT THAT HE GAVE DSCNT INSTRUCTIONS 10 NM AGO. IT WAS MORE LIKE 5-6 NM AND 10 WAS AN EMBELLISHMENT.
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.