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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier pilot misinterpreted his glass cockpit presentation and deviated from his assigned altitude.
| Attributes | |
| ACN | 336766 |
| Time | |
| Date | 199605 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | agl bound lower : 7000 agl bound upper : 9000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 195 flight time total : 2800 flight time type : 375 |
| ASRS Report | 336766 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 225 flight time total : 21000 flight time type : 1100 |
| ASRS Report | 336880 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : crossing restriction not met other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared for the approach to runway 4R when we were approximately 30 mi from ord and at 9000 ft. Degan is 23 DME from ord. Naper was the active waypoint on FMS. I looked at distance to the waypoint naper (20 mi) and interpreted it as DME thus concluding we were inside degan. Asked for altitude to be set at 5000 ft. While descending through 7000 ft approach control called and pointed out deviation. Remainder of approach uneventful. Contributing factors: 1) high level of radio chatter, 2) habit pattern of extending the final fix on visual approachs wipes out other fixes which causes you to use DME. (No problem most of the time, but DME was not associated with the ILS frequency tuned), 3) other crew member did not back up PF adequately, and 4) low time on glass. Supplemental information from acn 336880: by not having degan displayed on our FMS map, this problem occurred.
Original NASA ASRS Text
Title: AN ACR PLT MISINTERPRETED HIS GLASS COCKPIT PRESENTATION AND DEVIATED FROM HIS ASSIGNED ALT.
Narrative: CLRED FOR THE APCH TO RWY 4R WHEN WE WERE APPROX 30 MI FROM ORD AND AT 9000 FT. DEGAN IS 23 DME FROM ORD. NAPER WAS THE ACTIVE WAYPOINT ON FMS. I LOOKED AT DISTANCE TO THE WAYPOINT NAPER (20 MI) AND INTERPRETED IT AS DME THUS CONCLUDING WE WERE INSIDE DEGAN. ASKED FOR ALT TO BE SET AT 5000 FT. WHILE DSNDING THROUGH 7000 FT APCH CTL CALLED AND POINTED OUT DEV. REMAINDER OF APCH UNEVENTFUL. CONTRIBUTING FACTORS: 1) HIGH LEVEL OF RADIO CHATTER, 2) HABIT PATTERN OF EXTENDING THE FINAL FIX ON VISUAL APCHS WIPES OUT OTHER FIXES WHICH CAUSES YOU TO USE DME. (NO PROB MOST OF THE TIME, BUT DME WAS NOT ASSOCIATED WITH THE ILS FREQ TUNED), 3) OTHER CREW MEMBER DID NOT BACK UP PF ADEQUATELY, AND 4) LOW TIME ON GLASS. SUPPLEMENTAL INFO FROM ACN 336880: BY NOT HAVING DEGAN DISPLAYED ON OUR FMS MAP, THIS PROB OCCURRED.
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.