AD 89-23-17
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 Number 1 or 3 engine aft mount support fitting due to material fatigue in 7079-T6 or 7075-T73 materials.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct detailed visual inspections (or eddy current inspections outboard and visual inboard) for cracks in the Number 1 and 3 engine aft mount support fittings per Boeing Service Bulletin 727-54-0017. Repeat inspections every 3,000 flight cycles. Repair or replace cracked fittings before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 1,000 flight cycles or 1 year after the effective date (12/11/1989), whichever occurs first (for 7079-T6 material) or prior to 40,000 flight cycles or within the next 1,000 flight cycles after the effective date, whichever occurs later (for 7075-T73 material), unless previously accomplished within the last 2,000 flight cycles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Model 727 series airplanes certificated in any category.
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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