AD 96-26-52 R1
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
Failure of the engine pylon and consequent separation of the engine from the wing due to migration of the fuse pins installed at the midspar/spring beam fittings of the pylon.
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Required Actions
Perform a detailed visual inspection of the access doors to each midspar/spring beam fuse pin on each engine pylon to detect cracks on the external surface. If no cracking is detected, repeat inspections at intervals not exceeding 1,000 landings or 5,000 hours time-in-service, whichever occurs later, but not exceeding 18 months. If cracking is detected, repair prior to further flight and repeat inspections at the same intervals. Additionally, inspect each fuse pin to verify at least one thread protrudes beyond its mating nut; if not, repair prior to further flight and repeat inspections at the same intervals.
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Compliance Time
Within 15 days after January 8, 1997 (the effective date of AD 96-26-52, amendment 39-9868)
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Affected Aircraft
Boeing Model 747 series airplanes with line numbers 1 through 1046 inclusive, equipped with Pratt & Whitney PW4000, General Electric CF6-80C2, or Rolls Royce RB211 series engines; installed with third generation fuse pins (part numbers 310U2301-101, -116, -117, or -120); and not modified per Boeing Alert Service Bulletins 747-54A2156 or 747-54A2157.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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