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ATC-small transport altitude excursion resulted in less than standard separation from GA-small aircraft.
| Attributes | |
| ACN | 83889 |
| Time | |
| Date | 198803 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : rks |
| State Reference | WY |
| Altitude | msl bound lower : 10725 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 85 flight time total : 6850 flight time type : 600 |
| ASRS Report | 83889 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared direct rks, maintain 11000'. Copilot flying aircraft. During application of approach flaps (5 degrees) the aircraft lost 275', then leveled back at 11000'. The altitude alert in the aircraft did not chime. During this time, salt lake center cleared an small aircraft to level at 10000' in our area. We had no visual contact. Salt lake center inquired about our altitude loss and we responded that the problem had been corrected. After we returned to slc, they contacted me by phone. We had a computer generated deviation of less than 500' from assigned altitude. Our altitude alert system in the small transport was checked and found to be consistent at 285 deviations from assigned altitudes. Our aircraft never was more than 275' from our assigned altitude.
Original NASA ASRS Text
Title: ATC-SMT ALT EXCURSION RESULTED IN LESS THAN STANDARD SEPARATION FROM GA-SMA.
Narrative: CLRED DIRECT RKS, MAINTAIN 11000'. COPLT FLYING ACFT. DURING APPLICATION OF APCH FLAPS (5 DEGS) THE ACFT LOST 275', THEN LEVELED BACK AT 11000'. THE ALT ALERT IN THE ACFT DID NOT CHIME. DURING THIS TIME, SALT LAKE CENTER CLRED AN SMA TO LEVEL AT 10000' IN OUR AREA. WE HAD NO VISUAL CONTACT. SALT LAKE CENTER INQUIRED ABOUT OUR ALT LOSS AND WE RESPONDED THAT THE PROB HAD BEEN CORRECTED. AFTER WE RETURNED TO SLC, THEY CONTACTED ME BY PHONE. WE HAD A COMPUTER GENERATED DEVIATION OF LESS THAN 500' FROM ASSIGNED ALT. OUR ALT ALERT SYS IN THE SMT WAS CHKED AND FOUND TO BE CONSISTENT AT 285 DEVIATIONS FROM ASSIGNED ALTS. OUR ACFT NEVER WAS MORE THAN 275' FROM OUR ASSIGNED ALT.
Data retrieved from NASA's ASRS site as of August 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.