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First officer of an large transport aircraft inadvertently overshot descent altitude due to TCASII distraction.
| Attributes | |
| ACN | 245071 |
| Time | |
| Date | 199306 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bdl |
| State Reference | CT |
| Altitude | msl bound lower : 24600 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw artcc : czyz |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 15000 flight time type : 300 |
| ASRS Report | 245070 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 5500 |
| ASRS Report | 245560 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In a descent to FL250, got a TCASII alert at about FL255. I (PNF) began looking visually for conflicting aircraft. The first officer (PF) fixated on the TCASII screen and did not level aircraft at FL250. We descended to about FL246 before climbing back to FL250. Perhaps it's not a good idea to mix new and old technology. Ie, a TCASII that demands your attention and an autoplt that's incapable of capturing an altitude.
Original NASA ASRS Text
Title: FO OF AN LGT ACFT INADVERTENTLY OVERSHOT DSCNT ALT DUE TO TCASII DISTR.
Narrative: IN A DSCNT TO FL250, GOT A TCASII ALERT AT ABOUT FL255. I (PNF) BEGAN LOOKING VISUALLY FOR CONFLICTING ACFT. THE FO (PF) FIXATED ON THE TCASII SCREEN AND DID NOT LEVEL ACFT AT FL250. WE DSNDED TO ABOUT FL246 BEFORE CLBING BACK TO FL250. PERHAPS IT'S NOT A GOOD IDEA TO MIX NEW AND OLD TECHNOLOGY. IE, A TCASII THAT DEMANDS YOUR ATTN AND AN AUTOPLT THAT'S INCAPABLE OF CAPTURING AN ALT.
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.