aviation incident: BOEING 737 near San Francisco (2010-12-25)
type: Event
start date: 2010-12-25
location: San Francisco, CA, USA
  type: Place
  geo: GeoCoordinates
    latitude: 37.779628
    longitude: -122.419273
description: Probable cause: The probable cause of the undercowl in-flight engine fire was the insufficient installation torque of the bolts that secure the fuel manifold cover to the fuel manifold. Engine vibrations and fuel pressure cycles caused the bolts to gradually loosen further until one bolt lost all its tightening torque and fell out. The internal fuel pressure then forced open the fuel manifold cover at the location of the missing bolt, causing a gap between the two mating surfaces which allowed fuel to push past the integral packing, resulting in a fuel leak onto the hot engine cases where it ignited resulting in a fire.
citation: DigitalDocument
license: https://creativecommons.org/publicdomain/zero/1.0/
source: https://data.ntsb.gov/carol-main-public/basic-search
source organization: US National Transportation Safety Board
publisher: AI Analytics

PropertyValue
property ID: NTSB Case Number
value: ENG11IA011

AI Analytics
type: Organization