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ARTCC controller cleared an air carrier B727 to descend and cross lamma intersection at 15000 ft on STAR into mco. The B727 was following a B767 on the STAR that had a cargo door problem and was restr to 270 KTS. The B727 misinterp altitude crossing restr and descended below 15000 ft. Controller reporter saw mode C readout and altitude infraction at 13400 ft and tried to stop the B727 at 13000 ft. Aircraft overshot that altitude and less than standard separation occurred.
| Attributes | |
| ACN | 351020 |
| Time | |
| Date | 199610 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : omn airport : mco |
| State Reference | FL |
| Altitude | msl bound lower : 12000 msl bound upper : 12800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival star : star enroute airway : zjx |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 5 controller non radar : 5 controller radar : 10 |
| ASRS Report | 351020 |
| Person 2 | |
| Affiliation | government : faa |
| Function | oversight : supervisor |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The B767 was level at 12000 ft over omn BITH07 mco. The B727 was descending to 15000 ft, about 4 or 5 mi in-trail, routed omn BITH07 cof, and had a restr to cross lamma at and maintain 15000 ft. Pilot readback sounded like roger lamma at 15000 ft. The B767 was restr to 270 KTS due to a cargo door problem. The B727 was not speed restr. The B727 was observed descending below 15000 ft (mode C) and was immediately instructed to maintain 13000 ft. Pilot replied, roger 13000 ft we're going to have to go back up, mode C indicated 13400 ft. Traffic call was issued (B767), pilot of B727 reported traffic in sight. I instructed B727 to maintain visual separation from B767 and climb and maintain 15000 ft. Pilot acknowledged. I questioned pilot for assigned altitude. Pilot (B727) said he 'read back (11000 ft) one one thousand,' and to 'check the tape.' supervisor in-charge was notified of verbiage on radio and was at the sector during the event. Supervisor was trying to show developmental a speed function of the computer when incident started. Supervisor told the watch desk 'visual separation.'
Original NASA ASRS Text
Title: ARTCC CTLR CLRED AN ACR B727 TO DSND AND CROSS LAMMA INTXN AT 15000 FT ON STAR INTO MCO. THE B727 WAS FOLLOWING A B767 ON THE STAR THAT HAD A CARGO DOOR PROB AND WAS RESTR TO 270 KTS. THE B727 MISINTERP ALT XING RESTR AND DSNDED BELOW 15000 FT. CTLR RPTR SAW MODE C READOUT AND ALT INFRACTION AT 13400 FT AND TRIED TO STOP THE B727 AT 13000 FT. ACFT OVERSHOT THAT ALT AND LTSS OCCURRED.
Narrative: THE B767 WAS LEVEL AT 12000 FT OVER OMN BITH07 MCO. THE B727 WAS DSNDING TO 15000 FT, ABOUT 4 OR 5 MI IN-TRAIL, ROUTED OMN BITH07 COF, AND HAD A RESTR TO CROSS LAMMA AT AND MAINTAIN 15000 FT. PLT READBACK SOUNDED LIKE ROGER LAMMA AT 15000 FT. THE B767 WAS RESTR TO 270 KTS DUE TO A CARGO DOOR PROB. THE B727 WAS NOT SPD RESTR. THE B727 WAS OBSERVED DSNDING BELOW 15000 FT (MODE C) AND WAS IMMEDIATELY INSTRUCTED TO MAINTAIN 13000 FT. PLT REPLIED, ROGER 13000 FT WE'RE GOING TO HAVE TO GO BACK UP, MODE C INDICATED 13400 FT. TFC CALL WAS ISSUED (B767), PLT OF B727 RPTED TFC IN SIGHT. I INSTRUCTED B727 TO MAINTAIN VISUAL SEPARATION FROM B767 AND CLB AND MAINTAIN 15000 FT. PLT ACKNOWLEDGED. I QUESTIONED PLT FOR ASSIGNED ALT. PLT (B727) SAID HE 'READ BACK (11000 FT) ONE ONE THOUSAND,' AND TO 'CHK THE TAPE.' SUPVR IN-CHARGE WAS NOTIFIED OF VERBIAGE ON RADIO AND WAS AT THE SECTOR DURING THE EVENT. SUPVR WAS TRYING TO SHOW DEVELOPMENTAL A SPD FUNCTION OF THE COMPUTER WHEN INCIDENT STARTED. SUPVR TOLD THE WATCH DESK 'VISUAL SEPARATION.'
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.