AD 90-03-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 727 and 737 Series Airplanes |
Unsafe Condition
Takeoff configuration nuisance warnings during taxi operations with flaps intentionally retracted.
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Required Actions
Modify the Takeoff Configuration Warning System (TOCWS) logic according to specified Boeing Service Bulletins. Adjust thrust lever actuated switches to 19.5 degrees from idle stop and install a guarded, safety-wired circuit breaker for TOCWS. Alternate compliance may be approved by FAA.
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Compliance Time
within the next 30 months following the effective date of this AD
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Affected Aircraft
Boeing Model 727 and 737 series airplanes not equipped with Engine Pressure Ratio (EPR) logic for the takeoff warning system.
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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