# Proposed AD FAA-2004-19812: Boeing Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, and -300 Series Airplanes; and Model 747SP and 747SR Series Airplanes; Equipped With Pratt and Whitney Model JT9D-3 or -7 (except -70) Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-05-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 8, 2004, 69 FR 70936
- Comments due: January 24, 2005
- Became: [AD 2005-05-07](https://openairdocs.org/ad/2005-05-07)
- Docket: FAA-2004-19812 (https://www.regulations.gov/docket/FAA-2004-19812, where comments are filed)
- Project: 2003-NM-197-AD
- FR document: 04-26920
- Official PDF: https://openairdocs.org/files/sha256/6a/a2/6aa23a7d6a7504aa6d56b9b2781039152ead7fb283b56f92014f76e0561693c6 (from https://www.govinfo.gov/content/pkg/FR-2004-12-08/pdf/04-26920.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/12/08/04-26920/airworthiness-directives-boeing-model-747-100--100b--100b-sud--200b--200c--200f-and--300-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/03553CA3134D420486256F640050D73A.0001
- Page: https://openairdocs.org/proposed/FAA-2004-19812

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing transport category airplanes. This proposed AD would require repetitive detailed inspections to detect cracking of the aft and forward surfaces of the bulkhead web at nacelle station 180, and repair if necessary. This proposed AD is prompted by reports of cracking of the web bulkhead at nacelle station 180. We are proposing this AD to detect and correct fatigue cracking of the web bulkhead, and consequent loss of the load path of the bulkhead at nacelle station 180, which when combined with the loss of the midspar load path, could result in the in-flight separation of the engine and strut. Such separation may result in secondary damage to the airplane and consequent reduced controllability of the airplane.

## Notices in this docket

- Dec 8, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-26920, comments due Jan 24, 2005 (https://www.federalregister.gov/documents/2004/12/08/04-26920/airworthiness-directives-boeing-model-747-100--100b--100b-sud--200b--200c--200f-and--300-series)

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