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After normal maintenance and pilot preflight found no damage, an arrival inspection by maintenance after flight discovered a possible lightning strike. No significant WX was encountered en route.
| Attributes | |
| ACN | 439948 |
| Time | |
| Date | 199906 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 7400 flight time type : 2500 |
| ASRS Report | 439948 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other other : 2 |
| Resolutory Action | none taken : detected after the fact |
| Factors | |
| Maintenance | contributing factor : lighting performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
On jun/xa/99 prior to our initial departure from bos airport, I reviewed the aircraft logbook and maintenance release document. There were no problems noted by bos maintenance. I then accomplished my exterior inspection using a flashlight for the early dawn walkaround. The inspection was completed with nothing unusual noted about the left outboard aileron. After flying an uneventful 1 hour flight with no severe WX, we landed at washington dulles. The captain and I proceeded to operations. At that time, washington maintenance noticed on their standard arrival inspection that a lightning strike had occurred on the top of the left outboard aileron. Neither myself nor boston maintenance noticed any damage during our ground inspection prior to departure. The captain and I were uncertain that we were hit by lightning because we did not encounter any severe WX en route.
Original NASA ASRS Text
Title: AFTER NORMAL MAINT AND PLT PREFLT FOUND NO DAMAGE, AN ARR INSPECTION BY MAINT AFTER FLT DISCOVERED A POSSIBLE LIGHTNING STRIKE. NO SIGNIFICANT WX WAS ENCOUNTERED ENRTE.
Narrative: ON JUN/XA/99 PRIOR TO OUR INITIAL DEP FROM BOS ARPT, I REVIEWED THE ACFT LOGBOOK AND MAINT RELEASE DOCUMENT. THERE WERE NO PROBS NOTED BY BOS MAINT. I THEN ACCOMPLISHED MY EXTERIOR INSPECTION USING A FLASHLIGHT FOR THE EARLY DAWN WALKAROUND. THE INSPECTION WAS COMPLETED WITH NOTHING UNUSUAL NOTED ABOUT THE L OUTBOARD AILERON. AFTER FLYING AN UNEVENTFUL 1 HR FLT WITH NO SEVERE WX, WE LANDED AT WASHINGTON DULLES. THE CAPT AND I PROCEEDED TO OPS. AT THAT TIME, WASHINGTON MAINT NOTICED ON THEIR STANDARD ARR INSPECTION THAT A LIGHTNING STRIKE HAD OCCURRED ON THE TOP OF THE L OUTBOARD AILERON. NEITHER MYSELF NOR BOSTON MAINT NOTICED ANY DAMAGE DURING OUR GND INSPECTION PRIOR TO DEP. THE CAPT AND I WERE UNCERTAIN THAT WE WERE HIT BY LIGHTNING BECAUSE WE DID NOT ENCOUNTER ANY SEVERE WX ENRTE.
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.