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Air carrier on ILS runway 4R at bos is advised of ship in harbor; requiring decision height adjustment; resulting in go around.
| Attributes | |
| ACN | 760664 |
| Time | |
| Date | 200710 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 800 |
| Environment | |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : bos.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 4r |
| Flight Phase | descent : approach landing : go around cruise : level |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| ASRS Report | 760664 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : ground less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : executed go around |
| Supplementary | |
| Problem Areas | Airport ATC Human Performance |
| Primary Problem | Ambiguous |
Narrative:
The aircraft was on final approach on the ILS runway 4R approach to boston logan at approximately 2.5 mi and 800 ft when tower advised everyone on frequency that there was a large ship in the harbor with an unknown mast ht. The approach plate calls for the decision altitude to be raised from 250 ft to 350 ft when a large ship is in the harbor. The PNF (first officer) confirmed this alternation with the PF; and accordingly the 'minimums' were adjusted. At decision altitude a missed approach was executed adhering to air carrier X profiles and headings and altitudes assigned by tower.
Original NASA ASRS Text
Title: ACR ON ILS RWY 4R AT BOS IS ADVISED OF SHIP IN HARBOR; REQUIRING DECISION HEIGHT ADJUSTMENT; RESULTING IN GAR.
Narrative: THE ACFT WAS ON FINAL APCH ON THE ILS RWY 4R APCH TO BOSTON LOGAN AT APPROX 2.5 MI AND 800 FT WHEN TWR ADVISED EVERYONE ON FREQ THAT THERE WAS A LARGE SHIP IN THE HARBOR WITH AN UNKNOWN MAST HT. THE APCH PLATE CALLS FOR THE DECISION ALT TO BE RAISED FROM 250 FT TO 350 FT WHEN A LARGE SHIP IS IN THE HARBOR. THE PNF (FO) CONFIRMED THIS ALTERNATION WITH THE PF; AND ACCORDINGLY THE 'MINIMUMS' WERE ADJUSTED. AT DECISION ALT A MISSED APCH WAS EXECUTED ADHERING TO ACR X PROFILES AND HDGS AND ALTS ASSIGNED BY TWR.
Data retrieved from NASA's ASRS site as of January 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.