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ZOB controller issues descent clearance to an HS25 from FL240 to FL230, exchanging LJ23 traffic at FL220. Controller observes HS25 at FL225, questioning altitude. Controller turns both aircraft, but separation is lost.
| Attributes | |
| ACN | 427892 |
| Time | |
| Date | 199902 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : fdy.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 22500 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | HS 125 Series 1-600 |
| Flight Phase | cruise : enroute altitude change descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 23 |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 427892 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 800 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft #1 (X) was inbound to fwa, checked on my frequency FL280 descending to FL240 requesting lower. I issued aircraft #1 FL230, which was read back. I issued a 30 degree right turn to expedite aircraft #1's descent. I issued traffic to both aircraft (traffic at 1 O'clock, 5 mi swbound, FL220 lear jet Y). I noticed aircraft #1's altitude of FL225 and asked aircraft to verify assigned altitude of FL230. Pilot said he was cleared to FL210. I issued aircraft #1 a 180 degree heading (approximately 100 degree turn) and issued aircraft #2 a 300 degree heading (approximately 70 degree turn). Aircraft #1 continued to FL210 and once they became separated, both aircraft were cleared on course.
Original NASA ASRS Text
Title: ZOB CTLR ISSUES DSCNT CLRNC TO AN HS25 FROM FL240 TO FL230, EXCHANGING LJ23 TFC AT FL220. CTLR OBSERVES HS25 AT FL225, QUESTIONING ALT. CTLR TURNS BOTH ACFT, BUT SEPARATION IS LOST.
Narrative: ACFT #1 (X) WAS INBOUND TO FWA, CHKED ON MY FREQ FL280 DSNDING TO FL240 REQUESTING LOWER. I ISSUED ACFT #1 FL230, WHICH WAS READ BACK. I ISSUED A 30 DEG R TURN TO EXPEDITE ACFT #1'S DSCNT. I ISSUED TFC TO BOTH ACFT (TFC AT 1 O'CLOCK, 5 MI SWBOUND, FL220 LEAR JET Y). I NOTICED ACFT #1'S ALT OF FL225 AND ASKED ACFT TO VERIFY ASSIGNED ALT OF FL230. PLT SAID HE WAS CLRED TO FL210. I ISSUED ACFT #1 A 180 DEG HDG (APPROX 100 DEG TURN) AND ISSUED ACFT #2 A 300 DEG HDG (APPROX 70 DEG TURN). ACFT #1 CONTINUED TO FL210 AND ONCE THEY BECAME SEPARATED, BOTH ACFT WERE CLRED ON COURSE.
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.