# Proposed AD FAA-2010-0481: The Boeing Company Model 737-100 and - 200 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-17-14
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 19, 2010, 75 FR 27969
- Comments due: July 6, 2010
- Became: [AD 2010-17-14](https://openairdocs.org/ad/2010-17-14)
- Docket: FAA-2010-0481 (https://www.regulations.gov/docket/FAA-2010-0481, where comments are filed)
- Project: 2009-NM-192-AD
- FR document: 2010-11905
- Official PDF: https://openairdocs.org/files/sha256/bb/37/bb3778495c07368395a996062b3c59502122cd6fff9e63225be5a37d1cc12302 (from https://www.govinfo.gov/content/pkg/FR-2010-05-19/pdf/2010-11905.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/05/19/2010-11905/airworthiness-directives-the-boeing-company-model-737-100-and--200-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/45BCA1658FA9B6D786257728004E8CB3.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0481

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model 737-100 and -200 series airplanes. This proposed AD would require repetitive inspections for cracking and damaged fasteners of certain fuselage frames and stub beams, and corrective actions if necessary. For certain airplanes, this proposed AD would also require repetitive inspections for cracking of the inboard chord fastener hole of the frame at body station 639, stringer S-16, and corrective actions if necessary. For certain airplanes, this proposed AD would also require an inspection to determine the edge margin of the lower chord. For airplanes with a certain short edge margin, this proposed AD requires repetitive inspections for cracking, and corrective actions if necessary; replacing the lower chord terminates the repetitive inspections. This proposed AD requires an eventual preventive modification. For certain airplanes, doing the modification or a repair would terminate the repetitive inspectionsfor the repaired or modified frame only. For airplanes on which the modification or repair is done at certain body stations, this proposed AD would require repetitive inspections for cracking of certain frame webs and inner and outer chords, and corrective actions if necessary. For certain other airplanes, this proposed AD requires a modification which includes reinforcing the body frame inner chords, replacing the stub beam upper chords and attach angles, and reinforcing the stub beam web. This proposed AD results from reports of fatigue cracks at certain frame sections, in addition to stub beam cracking, caused by high flight cycle stresses from both pressurization and maneuver load. We are proposing this AD to detect and correct fatigue cracking of certain fuselage frames and stub beams, and possible severed frames, which could result in reduced structural integrity of the frames. This reduced structural integrity can increase loading in the fuselage skin, which will accelerate skin crack growth and result in rapid decompression of the fuselage.

## Notices in this docket

- May 19, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-11905, comments due Jul 6, 2010 (https://www.federalregister.gov/documents/2010/05/19/2010-11905/airworthiness-directives-the-boeing-company-model-737-100-and--200-series-airplanes)

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