AD 89-23-07
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
Cracked or fractured H-11 steel bolts could cause structural damage.
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Required Actions
Visually inspect H-11 steel bolts at specified locations for cracks or fractures within the next 15 months after the effective date or before accumulating 4 years total time-in-service, whichever is later. Replace cracked or fractured bolts with Inconel 718 bolts before further flight. If Inconel 718 bolts are unavailable, replace with H-11 steel bolts and repeat inspections every 18 months. Replace all affected H-11 bolts with Inconel 718 within 48 months after the effective date.
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Compliance Time
Prior to the accumulation of 4 years total time-in-service, or within the next 15 months after the effective date of this AD, whichever occurs later
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Affected Aircraft
BOEING Model 747 series airplanes listed in Boeing Service Bulletin 747-51-2043 dated June 30, 1988, certificated in any category.
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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