AD 73-26-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 Airplanes |
Unsafe Condition
Corrosion of torsion shafts may result in cracks, leading to failure of the shafts.
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Required Actions
Inspect torsion shafts for cracks within 750 landings after the effective date, and every 1500 landings thereafter. Replace cracked shafts with specified parts or designs prior to further flight. Replace non-compliant reworked shafts before 8,000 landings or within 3,000 landings after the effective date, whichever is later.
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Compliance Time
prior to further flight
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Affected Aircraft
Boeing Model 727 airplanes listed in Boeing Service Bulletin 727-32-203, Revision 3, dated November 21, 1973, or later FAA approved revisions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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