AD 86-08-03
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
Failure of the outboard engine strut aft diagonal brace due to cracking and heat treat temper condition issues.
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Required Actions
Perform close visual inspections for cracking within 200 landings, install sealant backup plates and heat resistant sealant over firewall openings, and conduct eddy current conductivity tests within 400 landings. Repeat inspections at intervals not exceeding 200 landings until subsequent steps are completed. Replace cracked parts before further flight.
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Compliance Time
Within the next 200 landings after the effective date of this AD for initial inspections, and within 400 landings for eddy current tests. Repeat inspections at intervals not to exceed 200 landings.
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Affected Aircraft
Boeing Model 747 series airplanes equipped with General Electric CF6-50 and Pratt and Whitney JT9D-70A engines, as listed in Boeing Service Bulletin 747-54A2117, Revision 1.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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