AD 75-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-600 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-700 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-800 Series | BOEING Model 737 Series Airplanes |
Unsafe Condition
Unwanted trailing edge flaps retraction and leading edge flap extension due to worn worm teeth in the flap power unit assemblies.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the flap power unit worm teeth for wear following specified service bulletins. Modify or replace assemblies with worn components beyond limits prior to further flight. Repetitive inspections must be conducted at intervals not exceeding specified landing counts. Inspections may be terminated if the mechanical system is replaced with an electrical system per specified service bulletins.
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Compliance Time
Within the next 750 landings, unless accomplished within the last 250 landings (for Line Nos. 1-269) or 750 landings (for Line Nos. 270-299). Repetitive inspections must be done at intervals not exceeding 5,000 landings (Method I) or 3,000 landings (Method II).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 737 series airplanes, Line Nos. 1 through 299 inclusive.
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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