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ZAU controller issues step-down altitude clearance to a BA46. After frequency change to next ZAU controller, BA46 descends through assigned altitude and comes into conflict with an FK27.
| Attributes | |
| ACN | 427980 |
| Time | |
| Date | 199902 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : fwa.vortac |
| State Reference | IL |
| Altitude | msl bound lower : 13000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Friendship F27 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change descent : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | BAe 146 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : enroute altitude change descent : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 2 controller military : 4 controller radar : 16 |
| ASRS Report | 427980 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 600 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft #1 (X) was at 12000 ft, given clearance to 11000 ft. Aircraft #2 (Y) was given 13000 ft, 10 mi behind and 200 KT overtake. Aircraft #2 (Y) read back 13000 ft and left FL240. Aircraft #2 (Y) checked on descending to 12000 ft (not heard) and went through 13000 ft next to aircraft #1 (X).
Original NASA ASRS Text
Title: ZAU CTLR ISSUES STEP-DOWN ALT CLRNC TO A BA46. AFTER FREQ CHANGE TO NEXT ZAU CTLR, BA46 DSNDS THROUGH ASSIGNED ALT AND COMES INTO CONFLICT WITH AN FK27.
Narrative: ACFT #1 (X) WAS AT 12000 FT, GIVEN CLRNC TO 11000 FT. ACFT #2 (Y) WAS GIVEN 13000 FT, 10 MI BEHIND AND 200 KT OVERTAKE. ACFT #2 (Y) READ BACK 13000 FT AND LEFT FL240. ACFT #2 (Y) CHKED ON DSNDING TO 12000 FT (NOT HEARD) AND WENT THROUGH 13000 FT NEXT TO ACFT #1 (X).
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.