# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2012-02-13 · Effective 2012-03-19 · 77 FR 7518
## Document
- **Document number:** 2012-2679
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 7518
- **Publication date:** 2012-02-13
- **Effective date:** 2012-03-19
- **FAA docket:** Docket No. FAA-2006-25001
## Abstract

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by a report that the top 3 inches of the aero/fire seals of the blocker doors on the thrust reverser torque boxes are not fireproof. This AD requires a one-time inspection to determine the part numbers of the aero/fire seals of the blocker doors on the thrust reverser torque boxes on the engines, and replacing affected aero/fire seals with new, improved aero/fire seals. We are issuing this AD to prevent a fire in the fan compartment (a fire zone) from migrating through the seal to a flammable fluid in the thrust reverser actuator compartment (a flammable fluid leakage zone), which could result in an uncontrolled fire.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/02/13/2012-2679/airworthiness-directives-the-boeing-company-airplanes)
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