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A B767 flight crew descended below the assigned crossing restr after inadvertently setting the wrong altitude in the altitude alerter during training activity. The instructor pilot reports that the numbers in the clearance were confusing and contributed to the mistake.
| Attributes | |
| ACN | 335010 |
| Time | |
| Date | 199604 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ftz airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 11700 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute : direct enroute airway : ztl |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain instruction : instructor oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 21000 flight time type : 210 |
| ASRS Report | 335010 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer instruction : trainee |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 80 flight time total : 5230 flight time type : 8 |
| ASRS Report | 334833 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared to cross 11 mi west of ftz VOR at 15000 ft and 250 KTS. PNF had set 11000 ft in altitude alert, but FMC was programmed for 15000 ft and 250 KTS. At 11700 ft ATC asked if we were descending to 11000 ft. We answered affirmative and then realized our clearance was for 15000 ft. Center said that was fine and to maintain 11000 ft. This event happened during IOE for the first officer which is a higher workload than normal operations. The numbers on the SID show to cross kayla intersection at 11000 ft and 250 KTS, and kayla is 11 DME west of ftz. We were cleared direct to ftz and to cross 11 mi west at 15000 ft. I feel that too many similar numbers was a contributing factor.
Original NASA ASRS Text
Title: A B767 FLC DSNDED BELOW THE ASSIGNED XING RESTR AFTER INADVERTENTLY SETTING THE WRONG ALT IN THE ALT ALERTER DURING TRAINING ACTIVITY. THE INSTRUCTOR PLT RPTS THAT THE NUMBERS IN THE CLRNC WERE CONFUSING AND CONTRIBUTED TO THE MISTAKE.
Narrative: CLRED TO CROSS 11 MI W OF FTZ VOR AT 15000 FT AND 250 KTS. PNF HAD SET 11000 FT IN ALT ALERT, BUT FMC WAS PROGRAMMED FOR 15000 FT AND 250 KTS. AT 11700 FT ATC ASKED IF WE WERE DSNDING TO 11000 FT. WE ANSWERED AFFIRMATIVE AND THEN REALIZED OUR CLRNC WAS FOR 15000 FT. CTR SAID THAT WAS FINE AND TO MAINTAIN 11000 FT. THIS EVENT HAPPENED DURING IOE FOR THE FO WHICH IS A HIGHER WORKLOAD THAN NORMAL OPS. THE NUMBERS ON THE SID SHOW TO CROSS KAYLA INTXN AT 11000 FT AND 250 KTS, AND KAYLA IS 11 DME W OF FTZ. WE WERE CLRED DIRECT TO FTZ AND TO CROSS 11 MI W AT 15000 FT. I FEEL THAT TOO MANY SIMILAR NUMBERS WAS A CONTRIBUTING FACTOR.
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.