AD 90-23-16
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 gear selector valve installation could result in partial gear-up or all gear-up landings.
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Required Actions
Inspect the nose and body gear selector valve installation and the wing gear selector valve installation in accordance with Boeing Service Bulletins. Correct discrepancies prior to further flight. Retorque the self-locking nut to 50 to 80 inch-pound where discrepancies were corrected. Submit a report of any improper configuration to the FAA within 10 days of inspection completion.
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Compliance Time
Within 30 days of October 30, 1990 (the effective date of AD 90-19-10, Amendment 39-6743) for line positions 002 through 803; within 30 days after the effective date of this AD for line position 806. Special flight permits may be issued under FAR 21.197 and 21.199.
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Affected Aircraft
Boeing Model 747 series airplanes, line position 002 through 803, and 806 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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