AD 2018-07-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; the Boeing Company Airplanes |
Unsafe Condition
operation of unheated air data sensors in icing conditions, which could result in irregular airspeed or altitude indications, and possibly a runway overrun during a high speed rejected takeoff (RTO) or a stall/overspeed during flight.
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Required Actions
modifying the air data heat (ADH) system so that it activates when the left and right fuel switches are in the ON position, as specified in Boeing Alert Service Bulletin MD80-30A132, dated April 28, 2017, and Boeing Alert Service Bulletin MD90-30A031, dated June 2, 2017.
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Compliance Time
within 28 months after the effective date of this AD for Model MD-80 airplanes and within 27 months after the effective date of this AD for Model MD-90 airplanes
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Affected Aircraft
all The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87) airplanes, Model MD-88 airplanes, and Model MD-90-30 airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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