AD 97-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; Boeing Model 747 Series Airplanes |
Unsafe Condition
Cracking, corrosion, and fracturing of the lower and upper horizontal clevis legs of the strut midspar fittings due to stress corrosion, which could result in drooping of the strut at the strut-to-wing interface and separation of the engine and strut from the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for cracking, corrosion, and fracturing of the lower and upper horizontal clevis legs of the strut midspar fittings, replace discrepant parts with new parts or rework as necessary, and remove broken sealant from the clevis and fasteners following Boeing Alert Service Bulletin 747-54A2179, Revision 1.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective June 24, 1997.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, and other 747 series airplanes as specified in the AD, with affected midspar fittings and engine types (Pratt & Whitney JT9D, Rolls Royce RB211, General Electric CF6-45/-50).
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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