AD 75-04-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-100B Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200B Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200C Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-200F Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-300 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400 Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400D Series | BOEING Model 747 Airplanes |
| aircraft | The Boeing Company | 747-400F Series | BOEING Model 747 Airplanes |
Unsafe Condition
Erroneous information being displayed on flight instruments due to inadequate vertical rise in pitot-static tubing inboard of each pitot-static probe.
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Required Actions
Modify the pitot-static tubing to include a vertical rise just inboard of each pitot-static probe by following Work Package 1, 2, and 3 of Boeing Service Bulletin 747-34-2058 or later FAA approved revisions, or an approved alternative method.
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Compliance Time
Within the next 3,500 hours time in service after the effective date of this AD
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Affected Aircraft
All Model 747 airplanes certificated in all categories listed in Boeing Service Bulletin 747-34-2058 dated January 31, 1974, or later FAA approved revisions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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