# Proposed AD FAA-2005-22510: Boeing Model 747 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-10-16
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 26, 2005, 70 FR 56145
- Comments due: November 10, 2005
- Became: [AD 2006-10-16](https://openairdocs.org/ad/2006-10-16)
- Docket: FAA-2005-22510 (https://www.regulations.gov/docket/FAA-2005-22510, where comments are filed)
- Project: 2004-NM-32-AD
- FR document: 05-19142
- Official PDF: https://openairdocs.org/files/sha256/74/71/74717a03d41735448e65cc5a2efe2d49622e0b8d524a1a65725826dcdc5a4cf1 (from https://www.govinfo.gov/content/pkg/FR-2005-09-26/pdf/05-19142.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/09/26/05-19142/airworthiness-directives-boeing-model-747-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/11C292512834A801862570880052ADD0.0001
- Page: https://openairdocs.org/proposed/FAA-2005-22510

## Summary

The FAA proposes to supersede two existing airworthiness directives (ADs), one AD applicable to all Boeing Model 747 airplanes and the other AD applicable to certain Boeing Model 747 airplanes. The first AD currently requires repetitive inspections for cracking of the upper skin of the horizontal stabilizer center section and the rear spar upper chord, and repair if necessary. The other AD currently requires repetitive inspections for cracking of the upper skin of the outboard and center sections of the horizontal stabilizer and the rear spar structure, hinge fittings, terminal fittings, and splice plates; and repair if necessary. This proposed AD would add, for certain airplanes, repetitive inspections for cracking of the outboard and center sections of the horizontal stabilizer and repair if necessary. For certain other airplanes, this proposed AD would add a detailed inspection to determine the type of fasteners, related investigative actions, and repair if necessary. Thisproposed AD also would revise the compliance times for certain inspections and add alternate inspections for cracking of the upper skin of the center section and rear spar upper chord. This proposed AD is prompted by reports of cracking in the outboard and center section of the aft upper skin of the horizontal stabilizer, the rear spar chord, rear spar web, terminal fittings, and splice plates; and a report of fractured and cracked steel fasteners. We are proposing this AD to detect and correct this cracking, which could lead to reduced structural capability of the outboard and center sections of the horizontal stabilizer and could result in loss of control of the airplane.

## Notices in this docket

- Sep 26, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-19142, comments due Nov 10, 2005 (https://www.federalregister.gov/documents/2005/09/26/05-19142/airworthiness-directives-boeing-model-747-airplanes)

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