AD 98-04-29
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; Boeing Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; Boeing Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | Airworthiness Directives; Boeing Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | Airworthiness Directives; Boeing Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; Boeing Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; Boeing Model 727 Series Airplanes |
Unsafe Condition
The installation of manual extension gearbox assemblies with incorrect housings could reduce the structural integrity of the assembly and result in an inability to lock the main landing gear in a down position during landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a one-time visual inspection of the manual extension gearbox assembly to detect incorrect housings; perform repetitive dye penetrant inspections if incorrect housings are found; replace incorrect housings with correct ones.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
6 months for the initial visual inspection; prior to further flight for the dye penetrant inspection or replacement of discrepant parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, 727 Series, 727C Series airplanes.
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.