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After being issued a critical time hack climb clearance, a climbing air carrier fails to advise ZMP in a timely manner of a change of aircraft climb capability, resulting in a conflict with a cruise level, en route air carrier. Controller vectors unable to maintain separation.
| Attributes | |
| ACN | 601230 |
| Time | |
| Date | 200311 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mot.airport |
| State Reference | ND |
| Altitude | msl bound lower : 35000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 6 controller radar : 6 |
| ASRS Report | 601230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 1100 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft #1 was eastbound at FL330. Aircraft #2 was wbound at FL350. Aircraft #1 requested a climb to FL370. Since there was oncoming traffic (aircraft #2), I asked aircraft #1 how long it would take him to climb to and be level at FL370. His response was '2 1/2 mins.' I issued the climb clearance with a restr to be level at FL370 at XA59Z (2 1/2 mins). I also issued a time hack. At XA59Z, aircraft #1 was leaving FL360. When I questioned how much longer it would take, he replied 'another min. I had to slow it up.' I then issued vectors to both aircraft in an attempt to save separation. Separation was lost.
Original NASA ASRS Text
Title: AFTER BEING ISSUED A CRITICAL TIME HACK CLB CLRNC, A CLBING ACR FAILS TO ADVISE ZMP IN A TIMELY MANNER OF A CHANGE OF ACFT CLB CAPABILITY, RESULTING IN A CONFLICT WITH A CRUISE LEVEL, ENRTE ACR. CTLR VECTORS UNABLE TO MAINTAIN SEPARATION.
Narrative: ACFT #1 WAS EBOUND AT FL330. ACFT #2 WAS WBOUND AT FL350. ACFT #1 REQUESTED A CLB TO FL370. SINCE THERE WAS ONCOMING TFC (ACFT #2), I ASKED ACFT #1 HOW LONG IT WOULD TAKE HIM TO CLB TO AND BE LEVEL AT FL370. HIS RESPONSE WAS '2 1/2 MINS.' I ISSUED THE CLB CLRNC WITH A RESTR TO BE LEVEL AT FL370 AT XA59Z (2 1/2 MINS). I ALSO ISSUED A TIME HACK. AT XA59Z, ACFT #1 WAS LEAVING FL360. WHEN I QUESTIONED HOW MUCH LONGER IT WOULD TAKE, HE REPLIED 'ANOTHER MIN. I HAD TO SLOW IT UP.' I THEN ISSUED VECTORS TO BOTH ACFT IN AN ATTEMPT TO SAVE SEPARATION. SEPARATION WAS LOST.
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.