AD 90-04-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-81 (MD-81) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-82 (MD-82) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-83 (MD-83) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | DC-9-87 (MD-87) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
| aircraft | The Boeing Company | MD-88 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-80 and MD-88 Series Airplanes |
Unsafe Condition
Deactivation of the takeoff warning system by the flight crew to eliminate nuisance warnings during single-engine taxi operation, leading to potential takeoff in an unsafe configuration.
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Required Actions
Rewire the takeoff warning system throttle lever switches to place them in series instead of parallel, as approved by the FAA or per McDonnell Douglas Service Bulletin 31-34. An alternate means of compliance or adjustment may be approved by the FAA.
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Compliance Time
Within 12 months after the effective date of this AD
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Affected Aircraft
MCDONNELL DOUGLAS DC-9-80 and MD-88 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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