# Proposed AD FAA-2012-0490: the Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-16-12
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 30, 2012, 77 FR 31762
- Comments due: July 16, 2012
- Became: [AD 2012-16-12](https://openairdocs.org/ad/2012-16-12)
- Docket: FAA-2012-0490 (https://www.regulations.gov/docket/FAA-2012-0490, where comments are filed)
- Project: 2012-NM-066-AD
- FR document: 2012-13039
- Official PDF: https://openairdocs.org/files/sha256/0d/ec/0decc33c3b79b10639d663dcd81c3d8e45a36aa3ed943d9fbcf584744dd73446 (from https://www.govinfo.gov/content/pkg/FR-2012-05-30/pdf/2012-13039.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/05/30/2012-13039/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6720C7267A71C23A86257A0E004A7CAD.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0490

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 707 airplanes, and Model 720 and 720B series airplanes. This proposed AD was prompted by reports of cracking of the midspar fittings, and of the engine and nacelle strut separating from the airplane. This proposed AD would require performing a detailed inspection of the midspar fittings of the nacelle strut to confirm that the correct part number is installed, and installing the correct part number if necessary; performing repetitive high frequency eddy current inspections (HFEC) of the midspar fittings of the nacelle strut for cracks, and repair if necessary; and performing repetitive general visual inspections of the nacelle struts to verify that the nacelle strut has not drooped below its normal position, applying the droop stripe to the nacelle strut and sailboat fairing if necessary, and repair if necessary. We are proposing this AD to detect and correct cracking of the midspar fitting, which could result in separation of the nacelle strut and engine from the airplane while in flight, and consequent loss of controllability of the airplane.

## Notices in this docket

- May 30, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-13039, comments due Jul 16, 2012 (https://www.federalregister.gov/documents/2012/05/30/2012-13039/airworthiness-directives-the-boeing-company-airplanes)

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