AD 89-26-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) Series Airplanes |
Unsafe Condition
Failure of the rudder control sector due to cracks or insufficient wall thickness less than or equal to 0.020 inch.
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Required Actions
Within 60 days after the effective date, visually inspect the rudder control sector for cracks and wall thickness per McDonnell Douglas Alert Service Bulletin A27-302. If cracks or wall thickness ≤0.020 inch are found, repair or replace the sector before further flight. If temporary repair is done, permanently repair or replace within 6 months or 1,000 landings, whichever comes first. Submit findings report within 15 days of inspection.
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Compliance Time
Within 60 days after the effective date of this AD
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Affected Aircraft
MCDONNELL DOUGLAS DC-9-10 through -80, Model MD88, and C-9 (Military) series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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