AD 86-07-06
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 forward lug of an inboard pylon upper link.
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Required Actions
Perform a close visual or ultrasonic inspection of the forward lug of the inboard pylon upper link for cracks in accordance with Boeing Service Bulletin 747-54-2111, Revision 1. Replace or modify cracked parts prior to further flight. Repetitive inspections must be conducted at intervals of 850 landings (if prior inspection was visual) or 1,700 landings (if prior inspection was ultrasonic).
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Compliance Time
Within the next 850 landings after the effective date of this AD or prior to the accumulation of 8,000 landings, whichever occurs later
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Affected Aircraft
Boeing Model 747 series airplanes listed in Boeing Service Bulletin 747-54-2111, Revision 1, dated November 22, 1985.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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