AD 93-18-07
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
The unsafe condition could occur if the horizontal stabilizer trim actuator, position sensor, or control system components fail, leading to potential uncommanded movement of the horizontal stabilizer trim, which could result in reduced control effectiveness and possible loss of aircraft controllability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a repetitive inspection of the horizontal stabilizer trim actuator, position sensor, and control system components for any damage, wear, or malfunctions. Perform necessary repairs or replacements as specified in the approved Boeing Service Bulletin. Revise the airplane maintenance program to include the repetitive inspection requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to the completion of 500 flight hours, flight cycles, or 12 calendar months, whichever occurs first, after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 747 series airplanes, excluding specific models and serial numbers listed in the referenced Boeing Service Bulletin.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.