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B747. Crew noted tire pressure going down. They estimated that the tire would be flat at time of landing at destination. They made a precautionary landing before the tire went flat.
| Attributes | |
| ACN | 410227 |
| Time | |
| Date | 199807 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dtw airport : anc |
| State Reference | MI |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 190 flight time total : 18000 flight time type : 1300 |
| ASRS Report | 410227 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Discovered slow leak in #7 tire (left body gear). Pressure was falling at a rate that, had we continued to our original destination (nrt), we would probably have had zero pressure with the attendant problem of blowout possibility. We diverted into anc to replace the tire. We dumped fuel (75000 pounds) to get to landing weight. The landing was without incident.
Original NASA ASRS Text
Title: B747. CREW NOTED TIRE PRESSURE GOING DOWN. THEY ESTIMATED THAT THE TIRE WOULD BE FLAT AT TIME OF LNDG AT DEST. THEY MADE A PRECAUTIONARY LNDG BEFORE THE TIRE WENT FLAT.
Narrative: DISCOVERED SLOW LEAK IN #7 TIRE (L BODY GEAR). PRESSURE WAS FALLING AT A RATE THAT, HAD WE CONTINUED TO OUR ORIGINAL DEST (NRT), WE WOULD PROBABLY HAVE HAD ZERO PRESSURE WITH THE ATTENDANT PROB OF BLOWOUT POSSIBILITY. WE DIVERTED INTO ANC TO REPLACE THE TIRE. WE DUMPED FUEL (75000 LBS) TO GET TO LNDG WT. THE LNDG WAS WITHOUT 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.