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Air carrier large transport altitude deviation excursion from clearance altitude while watching TCASII traffic.
| Attributes | |
| ACN | 188571 |
| Time | |
| Date | 199109 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 14000 msl bound upper : 14700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 11000 flight time type : 550 |
| ASRS Report | 188571 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 12000 flight time type : 5000 |
| ASRS Report | 188745 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 33000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing out of sea in VMC under radar vectors to avoid a commuter at 15000 ft, we were restr to 14000 ft. Our aircraft was TCASII equipped. First officer was hand flying aircraft. While observing the conflicting traffic visually, we became somewhat fixated on the correlation between conflicting traffic's visual position and the TCASII display, inadvertently climbed to 14700 ft while restr to 14000 ft. Returned to 14000 and was advised by center that no alert had occurred and that no problem existed since conflicting aircraft never came within 5 mi of our position. The basic cause of incident was distraction due to TCASII presentation and visual observation of target aircraft. Contributing factor was the confign of the altitude alerting system on this aircraft. The alert light goes out 500 ft prior to selected altitude and does not alert again (light) until you have deviated by 500 ft, outside ATC's 300 ft threshold.
Original NASA ASRS Text
Title: ACR LGT ALT DEV EXCURSION FROM CLRNC ALT WHILE WATCHING TCASII TFC.
Narrative: CLBING OUT OF SEA IN VMC UNDER RADAR VECTORS TO AVOID A COMMUTER AT 15000 FT, WE WERE RESTR TO 14000 FT. OUR ACFT WAS TCASII EQUIPPED. FO WAS HAND FLYING ACFT. WHILE OBSERVING THE CONFLICTING TFC VISUALLY, WE BECAME SOMEWHAT FIXATED ON THE CORRELATION BTWN CONFLICTING TFC'S VISUAL POS AND THE TCASII DISPLAY, INADVERTENTLY CLBED TO 14700 FT WHILE RESTR TO 14000 FT. RETURNED TO 14000 AND WAS ADVISED BY CENTER THAT NO ALERT HAD OCCURRED AND THAT NO PROBLEM EXISTED SINCE CONFLICTING ACFT NEVER CAME WITHIN 5 MI OF OUR POS. THE BASIC CAUSE OF INCIDENT WAS DISTR DUE TO TCASII PRESENTATION AND VISUAL OBSERVATION OF TARGET ACFT. CONTRIBUTING FACTOR WAS THE CONFIGN OF THE ALT ALERTING SYS ON THIS ACFT. THE ALERT LIGHT GOES OUT 500 FT PRIOR TO SELECTED ALT AND DOES NOT ALERT AGAIN (LIGHT) UNTIL YOU HAVE DEVIATED BY 500 FT, OUTSIDE ATC'S 300 FT THRESHOLD.
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.