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A320 flight crew, inbound to sjc, reference wrong NAVAID DME and initiate descent prior to assigned O90 crossing restr.
| Attributes | |
| ACN | 559235 |
| Time | |
| Date | 200209 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sjc.airport |
| State Reference | CA |
| Altitude | msl bound lower : 6300 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : o90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 12500 flight time type : 2600 |
| ASRS Report | 559235 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : radar mode c other controllera |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : became reoriented flight crew : overrode automation |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was calling company operations shortly before reaching 10000 ft, since there is a hill that causes radio interference further out. When I came back on ATC frequency, we had been cleared to 8000 ft and switched to approach. The approach controller gave us a clearance to cross 28 DME from sjc at or above 8000 ft and cleared us for the visual approach to runway 30R. The captain dialed in 4300 ft, looked at the DME and started a descent. I told him something seemed wrong. He pointed to his DME which showed 22 NM DME. About that time, bay approach called and asked our DME. I responded '22 mi.' I quickly brought up the radio navigation page and realized the captain had been navigating off the sns VOR. I quickly entered sjc VOR and our DME showed 26. Our altitude was 6300 ft. Bay approach gave us a clearance to cross 17 DME at 5000 ft, which we complied with, and continued the approach without further incident.
Original NASA ASRS Text
Title: A320 FLC, INBOUND TO SJC, REF WRONG NAVAID DME AND INITIATE DSCNT PRIOR TO ASSIGNED O90 XING RESTR.
Narrative: I WAS CALLING COMPANY OPS SHORTLY BEFORE REACHING 10000 FT, SINCE THERE IS A HILL THAT CAUSES RADIO INTERFERENCE FURTHER OUT. WHEN I CAME BACK ON ATC FREQ, WE HAD BEEN CLRED TO 8000 FT AND SWITCHED TO APCH. THE APCH CTLR GAVE US A CLRNC TO CROSS 28 DME FROM SJC AT OR ABOVE 8000 FT AND CLRED US FOR THE VISUAL APCH TO RWY 30R. THE CAPT DIALED IN 4300 FT, LOOKED AT THE DME AND STARTED A DSCNT. I TOLD HIM SOMETHING SEEMED WRONG. HE POINTED TO HIS DME WHICH SHOWED 22 NM DME. ABOUT THAT TIME, BAY APCH CALLED AND ASKED OUR DME. I RESPONDED '22 MI.' I QUICKLY BROUGHT UP THE RADIO NAV PAGE AND REALIZED THE CAPT HAD BEEN NAVING OFF THE SNS VOR. I QUICKLY ENTERED SJC VOR AND OUR DME SHOWED 26. OUR ALT WAS 6300 FT. BAY APCH GAVE US A CLRNC TO CROSS 17 DME AT 5000 FT, WHICH WE COMPLIED WITH, AND CONTINUED THE APCH WITHOUT FURTHER INCIDENT.
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.