# Airworthiness Directives; Boeing Model 747 Airplanes
> **Rule** · Final rule; request for comments. · Published 2009-05-20 · Effective 2009-06-04 · 74 FR 23619
## Document
- **Document number:** E9-11284
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 74 FR 23619
- **Publication date:** 2009-05-20
- **Effective date:** 2009-06-04
- **FAA docket:** Docket No. FAA-2009-0450
## Abstract

The FAA is superseding an existing airworthiness directive (AD) that applies to certain Boeing Model 747 airplanes. The existing AD currently requires modifying the inflation systems of the upper deck escape slides; single-piece off-wing escape ramps/slides; two-piece off-wing escape slides; and door 1, 2, 4, and 5 escape slides/rafts; as applicable. This AD expands the applicability to include an additional airplane. This AD results from a report of 30- to 60-second delays in the inflation of escape slides/rafts. We are issuing this AD to prevent actuation delays in the inflation systems of the escape slides/rafts, which could result in delayed or failed deployment of escape slides/ rafts during emergency evacuation of an airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/05/20/E9-11284/airworthiness-directives-boeing-model-747-airplanes)
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