AD 91-22-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; BOEING Model 727 Series Airplanes |
Unsafe Condition
Cracking in the main landing gear (MLG) wheel well pressure floor at body stations 910, 900, and 920, which could lead to structural failure.
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Required Actions
Perform detailed visual, high frequency eddy current (HFEC), or dye penetrant inspections for cracks in the pressure floor at specified body stations per Boeing Alert Service Bulletin 727-53A0124, Revision 3. Repeat inspections at intervals not exceeding 2,000 landings (or 4,000/5,000 landings depending on inspection technique). Repair cracks within specified limits before further flight using interim or permanent repairs as per the service bulletin. Replace blind fasteners within 10,000 landings since installation and inspect them periodically.
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Compliance Time
Prior to the accumulation of 15,000 landings or within 800 landings after November 2, 1974, whichever occurs later; or prior to the accumulation of 12,000 landings or within 2,000 landings after the effective date of this AD (December 13, 1991), whichever occurs later.
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Affected Aircraft
Boeing Model 727 series airplanes, certificated in any category, with line numbers 001 through 1102 (except those modified per specified service bulletins) and line number 1103 and subsequent (if not modified per service bulletins).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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