AD 98-18-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; Boeing Model 727 and Model 737 Series Airplanes |
Unsafe Condition
Improper functioning of the engine fuel shutoff valve and fuel system crossfeed valve actuators due to clutch binding, which could result in fuel imbalance from inability to crossfeed fuel or prevent fuel shutdown following engine failure or fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the actuator of the engine fuel shutoff valve and fuel system crossfeed valve with an improved actuator as specified in J.C. Carter Company Service Bulletin 61163-28-09 (dated May 1, 1996) or the September 28, 1995 version, including procedures from 737 Maintenance Manual 28-22-11/400.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 727 and Model 737 series airplanes with affected Kearfott actuators (part numbers 3715-7, 3715-8, 3715-9, and optional 40574-1).
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.