Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400F, 747SR, and 747SP Series Airplanes
type: Action
additional type: https://schema.org/LegalForceStatus
description: We are adopting a new airworthiness directive (AD) for certain Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400F, 747SR, and 747SP series airplanes. This AD requires reworking or replacing certain duct assemblies in the environmental control system (ECS). This AD results from reports of duct assemblies in the ECS with burned Boeing Material Specification (BMS) 8-39 polyurethane foam insulation. This proposed AD also results from a report from the airplane manufacturer that airplanes were assembled with duct assemblies in the ECS wrapped with BMS 8-39 polyurethane foam insulation, a material of which the fire retardant properties deteriorate with age. We are issuing this AD to prevent a potential electrical arc from igniting the BMS 8-39 polyurethane foam insulation on the duct assemblies of the ECS, which could propagate a small fire and lead to a larger fire that might spread throughout the airplane through the ECS.
date published: 2010-07-01
start time: 2010-08-05
agent: Federal Aviation Administration
  type: GovernmentOrganization
  parent organization: US Department of Transportation
citation: DigitalDocument
license: https://creativecommons.org/publicdomain/zero/1.0/
source: https://www.federalregister.gov/documents/2010/07/01/2010-15659/airworthiness-directives-the-boeing-company-model-747-100-747-100b-747-100b-sud-747-200b-747-200c
source organization: US Federal Register
publisher: AI Analytics

PropertyValue
property ID: Federal Register Document Number
value: 2010-15659

PropertyValue
property ID: Federal Register Citation
value: 75 FR 38007

PropertyValue
property ID: FAA Docket
value: Docket No. FAA-2010-0275

AI Analytics
type: Organization