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Flight crew descends aircraft on SID arrival too soon when reading wrong DME for approach. Associated with aircraft equipment problem. Navigation error.
| Attributes | |
| ACN | 344450 |
| Time | |
| Date | 199608 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 250 flight time total : 3700 flight time type : 4000 |
| ASRS Report | 344450 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 80 flight time total : 18000 flight time type : 7000 |
| ASRS Report | 344967 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : published procedure non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While transitioning tus-lax, it was determined the ONS was unreliable. The #2 DME was erratic and slow to lock on a selected station. Proceeding direct tnp from gbn, ZLA cleared us direct civet, civet arrival lax. We advised ZLA that the ONS was unreliable for point to point navigation because of drift and DME problems. ZLA then cleared us present position direct pomona VOR to intercept the ILS runway 25L localizer (lax), civet arrival lax. Proceeding as cleared, the #2 DME would not lock on runway 25L localizer DME (lax) the ONS was unreliable, therefore switching #1 DME from pomona to ilax would have given us DME for the civet. During the numerous switches, the #1 DME pomona was mistaken for ilax. A descent was accomplished to meet altitude requirements at civet and bremr. At 12000 ft, for what we thought was bremr intersection, (using pomona DME), local approach asked about our references for DME and azimuth. When we informed them of our obtuse clearance, they requested we climb to 13000 ft and recommence the civet arrival at bremr (lax runway 25L localizer DME). This was accomplished along with an uneventful landing.
Original NASA ASRS Text
Title: FLC DSNDS ACFT ON SID ARR TOO SOON WHEN READING WRONG DME FOR APCH. ASSOCIATED WITH ACFT EQUIP PROB. NAV ERROR.
Narrative: WHILE TRANSITIONING TUS-LAX, IT WAS DETERMINED THE ONS WAS UNRELIABLE. THE #2 DME WAS ERRATIC AND SLOW TO LOCK ON A SELECTED STATION. PROCEEDING DIRECT TNP FROM GBN, ZLA CLRED US DIRECT CIVET, CIVET ARR LAX. WE ADVISED ZLA THAT THE ONS WAS UNRELIABLE FOR POINT TO POINT NAV BECAUSE OF DRIFT AND DME PROBS. ZLA THEN CLRED US PRESENT POS DIRECT POMONA VOR TO INTERCEPT THE ILS RWY 25L LOC (LAX), CIVET ARR LAX. PROCEEDING AS CLRED, THE #2 DME WOULD NOT LOCK ON RWY 25L LOC DME (LAX) THE ONS WAS UNRELIABLE, THEREFORE SWITCHING #1 DME FROM POMONA TO ILAX WOULD HAVE GIVEN US DME FOR THE CIVET. DURING THE NUMEROUS SWITCHES, THE #1 DME POMONA WAS MISTAKEN FOR ILAX. A DSCNT WAS ACCOMPLISHED TO MEET ALT REQUIREMENTS AT CIVET AND BREMR. AT 12000 FT, FOR WHAT WE THOUGHT WAS BREMR INTXN, (USING POMONA DME), LCL APCH ASKED ABOUT OUR REFS FOR DME AND AZIMUTH. WHEN WE INFORMED THEM OF OUR OBTUSE CLRNC, THEY REQUESTED WE CLB TO 13000 FT AND RECOMMENCE THE CIVET ARR AT BREMR (LAX RWY 25L LOC DME). THIS WAS ACCOMPLISHED ALONG WITH AN UNEVENTFUL LNDG.
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.