AD 86-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Series Airplanes |
Unsafe Condition
Separation of an engine due to failed H-11 bolts in the outboard attach fitting nacelle struts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform visual inspections of outboard and inboard attach fitting H-11 bolts for structural integrity per Boeing Service Bulletin 747-57A2235, replace failed bolts before further flight, and replace all remaining H-11 bolts with Inconel bolts within specified timeframes.
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Compliance Time
Prior to accumulation of 10,000 flight hours or within 100 landings after the effective date (12/01/1986), whichever occurs later for outboard inspections; prior to 10,000 flight hours or within 600 landings after effective date, whichever occurs later for inboard inspections. Outboard bolt replacement within 24 months after effective date; inboard within 48 months.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747 series airplanes, line numbers 1 through 644.
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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