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Small aircraft pilot on INS approach using a STAR. Cleared for approach and upon interception of localizer descends to published altitude. Low altitude alert and instructions to climb 1000'.
| Attributes | |
| ACN | 141860 |
| Time | |
| Date | 199004 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : fat |
| State Reference | CA |
| Altitude | msl bound lower : 1700 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : fat tracon : ont |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 20 flight time total : 2100 flight time type : 1500 |
| ASRS Report | 141860 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
Cleared by approach, 'altta 4 arrival.' I asked if cleared to descend from 6000' (assigned) to 3500' per arrival.' answered by fat approach, 'negative, fly radials only.' therefore, I maintained last assigned altitude of 6000'. At altta was cleared for ILS 29R approach, but altta is not shown on commercial chart approach plate. I estimated I was near selma, which is shown on plate, and descended to 2000'. When established on localizer, descended to 1700' per approach plate. Tower gave low altitude alert. Maintained 1800' to hilan then flew normal ILS to landing. Suggest: add selma to altta 4 approach STAR, or add altta to approach plate to eliminate confusion, and change ATC procedure reference altta 4 to say, 'cleared altta 4 arrival, fly radials only, maintain XXXX altitude.'
Original NASA ASRS Text
Title: SMA PLT ON INS APCH USING A STAR. CLEARED FOR APCH AND UPON INTERCEPTION OF LOCALIZER DESCENDS TO PUBLISHED ALT. LOW ALT ALERT AND INSTRUCTIONS TO CLIMB 1000'.
Narrative: CLRED BY APCH, 'ALTTA 4 ARR.' I ASKED IF CLRED TO DSND FROM 6000' (ASSIGNED) TO 3500' PER ARR.' ANSWERED BY FAT APCH, 'NEGATIVE, FLY RADIALS ONLY.' THEREFORE, I MAINTAINED LAST ASSIGNED ALT OF 6000'. AT ALTTA WAS CLRED FOR ILS 29R APCH, BUT ALTTA IS NOT SHOWN ON COMMERCIAL CHART APCH PLATE. I ESTIMATED I WAS NEAR SELMA, WHICH IS SHOWN ON PLATE, AND DSNDED TO 2000'. WHEN ESTABLISHED ON LOC, DSNDED TO 1700' PER APCH PLATE. TWR GAVE LOW ALT ALERT. MAINTAINED 1800' TO HILAN THEN FLEW NORMAL ILS TO LNDG. SUGGEST: ADD SELMA TO ALTTA 4 APCH STAR, OR ADD ALTTA TO APCH PLATE TO ELIMINATE CONFUSION, AND CHANGE ATC PROC REF ALTTA 4 TO SAY, 'CLRED ALTTA 4 ARR, FLY RADIALS ONLY, MAINTAIN XXXX 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.