# Proposed AD FAA-2005-20325: Boeing Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, and -300 Series Airplanes; and Model 747SP and 747SR Series Airplanes; Equipped With Pratt & Whitney Model JT9D-3, and -7 Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-16-11
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 10, 2005, 70 FR 7052
- Comments due: March 28, 2005
- Became: [AD 2005-16-11](https://openairdocs.org/ad/2005-16-11)
- Docket: FAA-2005-20325 (https://www.regulations.gov/docket/FAA-2005-20325, where comments are filed)
- Project: 2003-NM-129-AD
- FR document: 05-2575
- Official PDF: https://openairdocs.org/files/sha256/8e/d9/8ed92738235debd17682d9f89446ad0025a7c12149ec5091ec27ac51a9cfe05e (from https://www.govinfo.gov/content/pkg/FR-2005-02-10/pdf/05-2575.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/02/10/05-2575/airworthiness-directives-boeing-model-747-100--100b--100b-sud--200b--200c--200f-and--300-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3031ABC16FF91DBE86256FA4005E083D.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20325

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing transport category airplanes listed above. This proposed AD would require repetitive inspections for cracks of the upper surface of the aft lower spar web of the inboard and outboard struts, as applicable; and repetitive inspections for cracks of the upper surface of the intermediate web bay of the aft lower spar. This proposed AD would also require repetitive inspections and torque checks of the bolts common to the aft lower spar chords and the fitting of the rear engine mount bulkhead for missing, loose, or fractured bolts, as applicable; and corrective action, if necessary. This proposed AD is prompted by reports of cracking in the aft lower spar web and reports of missing and fractured bolts. We are proposing this AD to detect and correct cracking of the aft lower spar web, and to prevent missing, loose, or fractured bolts common to the aft lower spar chords and the fitting of the rear engine mount bulkhead, which could result in the loss of the aft lower spar load path and reduced structural capability of the pylon, which may result in the separation of the engine from the airplane.

## Notices in this docket

- Feb 10, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-2575, comments due Mar 28, 2005 (https://www.federalregister.gov/documents/2005/02/10/05-2575/airworthiness-directives-boeing-model-747-100--100b--100b-sud--200b--200c--200f-and--300-series)

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