AD 87-12-04
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
Loss of all four hydraulic systems in the event of severe damage to or loss of the vertical stabilizer.
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Required Actions
Install a hydraulic fuse in the number 4 hydraulic system in accordance with Boeing Service Bulletin 747-29-2063 or later FAA-approved revision. An alternate means of compliance or adjustment of compliance time may be approved by the Manager, Seattle Aircraft Certification Office. Special flight permits may be issued under FAR 21.197 and 21.199 to operate to a base for modification.
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Compliance Time
Within the next 24 months after the effective date of this AD
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Affected Aircraft
Model 747 series airplanes listed in Boeing Service Bulletin 747-29-2063, dated December 23, 1986, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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