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Sfo supervisor controller instructed local controller to allow aircraft to land on second approach when no traffic was sighted on runway; amass/asde alerts both approachs.
| Attributes | |
| ACN | 775665 |
| Time | |
| Date | 200802 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | agl single value : 300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sfo.tower |
| Operator | general aviation : personal |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | oversight : supervisor |
| Qualification | controller : radar |
| Experience | controller limited radar : 15 controller non radar : 1 |
| ASRS Report | 775665 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | atc equipment other atc equipment : amass/asde other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Navigational Facility |
| Primary Problem | Navigational Facility |
Narrative:
Runway 28R was closed for work by city. Amass/asde showed the closure. At XA00Z; LJ35 was on 1/2 mi final for runway 28L. Amass advised to go around due to runway 28R occupied with aural and visual alerts. LJ35 was observed by tower controller to be lined up for runway 28L. As per 7110.65 the aircraft was sent around. As LJ35 passed 1/4 mi final; amass alerted for runway 28R being closed with aural and visual alerts. At XA13Z LJ35 was again on 1/2 mi final for runway 28L with identical alerts. I visually scanned runway 28L and the position of the aircraft and advised the tower controller to let LJ35 land on runway 28L. I discussed the situation with the pilot and he said that both times he was slightly left of course. The same false alerts also happened with the identical scenario on another day at XA48Z. During this incident it was also an LJ35.
Original NASA ASRS Text
Title: SFO SUPVR CTLR INSTRUCTED LCL CTLR TO ALLOW ACFT TO LAND ON SECOND APCH WHEN NO TFC WAS SIGHTED ON RWY; AMASS/ASDE ALERTS BOTH APCHS.
Narrative: RWY 28R WAS CLOSED FOR WORK BY CITY. AMASS/ASDE SHOWED THE CLOSURE. AT XA00Z; LJ35 WAS ON 1/2 MI FINAL FOR RWY 28L. AMASS ADVISED TO GO AROUND DUE TO RWY 28R OCCUPIED WITH AURAL AND VISUAL ALERTS. LJ35 WAS OBSERVED BY TWR CTLR TO BE LINED UP FOR RWY 28L. AS PER 7110.65 THE ACFT WAS SENT AROUND. AS LJ35 PASSED 1/4 MI FINAL; AMASS ALERTED FOR RWY 28R BEING CLOSED WITH AURAL AND VISUAL ALERTS. AT XA13Z LJ35 WAS AGAIN ON 1/2 MI FINAL FOR RWY 28L WITH IDENTICAL ALERTS. I VISUALLY SCANNED RWY 28L AND THE POS OF THE ACFT AND ADVISED THE TWR CTLR TO LET LJ35 LAND ON RWY 28L. I DISCUSSED THE SITUATION WITH THE PLT AND HE SAID THAT BOTH TIMES HE WAS SLIGHTLY L OF COURSE. THE SAME FALSE ALERTS ALSO HAPPENED WITH THE IDENTICAL SCENARIO ON ANOTHER DAY AT XA48Z. DURING THIS INCIDENT IT WAS ALSO AN LJ35.
Data retrieved from NASA's ASRS site as of May 2009 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.