| Crash location | Unknown |
| Nearest city | Seattle, WA
47.606209°N, 122.332071°W |
| Tail number | N604US |
|---|---|
| Accident date | 22 Aug 1991 |
| Aircraft type | Boeing 747-151 |
| Additional details: | None |
A FIRE IN THE NUMBER 4 ENGINE, RESULTING FROM A FUEL LEAK AT THE MAIN FUEL CONTROL UNIT, DUE TO IMPROPER MAINTENANCE BY UNKNOWN/UNDETERMINED PERSON. THE L5 EMERGENCY EXIT FAILED TO OPERATEE DUE TO A BROKEN PLASTIC PULLEY GUARD IN THE SLIDE RELEASE MECHANISM.