What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Pilot reported that during cruise @35,000', from st. louis to phoenix, the a/c yawed sharply to the left. Pilot noted rapid fluctuations in the left engines instruments along with a perceptible drop in EGT. Further, there was an electrical smell and slight smoke in the cockpit. The disruption lasted for approx. 10 seconds after which the left engine fully recovered. An emergency was declared and the a/c landed wihtout incident. Pilot stated that whil completing the checklist and in preparation for landing no engine abnormalities were noted and a normal landing was made. Discussions with swaa ppm (maintenance) indicate corrosion in the cannon plug of the fuel spar valve in the left wheel well is known to be a casual factor in related occurrences and is currently addressed in a Boeing service letter. N635SW ferried to dfw for maintenance.
As the FAA filed it
(-23) PILOT REPORTED THAT DURING CRUISE @35,000', FROM ST. LOUIS TO PHOENIX, THE A/C YAWED SHARPLY TO THE LEFT. PILOT NOTED RAPID FLUCTUATIONS IN THE LEFT ENGINES INSTRUMENTS ALONG WITH A PERCEPTIBLE DROP IN EGT. FURTHER, THERE WAS AN ELECTRICAL SMELL AND SLIGHT SMOKE IN THE COCKPIT. THE DISRUPTION LASTED FOR APPROX. 10 SECONDS AFTER WHICH THE LEFT ENGINE FULLY RECOVERED. AN EMERGENCY WAS DECLARED AND THE A/C LANDED WIHTOUT INCIDENT. PILOT STATED THAT WHIL COMPLETING THE CHECKLIST AND IN PREPARATION FOR LANDING NO ENGINE ABNORMALITIES WERE NOTED AND A NORMAL LANDING WAS MADE. DISCUSSIONS WITH SWAA PPM (MAINTENANCE) INDICATE CORROSION IN THE CANNON PLUG OF THE FUEL SPAR VALVE IN THE LEFT WHEEL WELL IS KNOWN TO BE A CASUAL FACTOR IN RELATED OCCURRENCES AND IS CURRENTLY ADDRESSED IN A BOEING SERVICE LETTER. N635SW FERRIED TO DFW FOR MAINTENANCE.