AD 91-09-06
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
Potential for a fire due to rupture of the auxiliary fuel tanks.
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Required Actions
Install a check valve and a pressure actuated shutoff valve in the center wing tank, or deactivate the auxiliary fuel system and insert a placard indicating inoperability, both in accordance with Boeing Alert Service Bulletin 727-28A0067, Revision 1.
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Compliance Time
Within the next 18 months after the effective date of this AD
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Affected Aircraft
Boeing Model 727 series airplanes equipped with forward and/or aft auxiliary fuel tanks listed in Boeing Alert Service Bulletin 727-28A0067, Revision 1, dated July 5, 1990.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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