AD 99-21-32
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | MD-90-30 | Airworthiness Directives; McDonnell Douglas Model MD-90-30 Series Airplanes |
Unsafe Condition
Interference between the elevator cable pulley and the shroud frame of the ventral stairway could result in pitch oscillation of the airplane, consequent damage to the elevator cable pulley, and reduced controllability.
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Required Actions
Perform a one-time general visual inspection to measure clearance and detect interference between the elevator cable pulley and the shroud frame of the ventral stairway within 12 months after the effective date. Modify the shroud frame of the ventral stairway in accordance with the referenced service bulletin.
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Compliance Time
Within 12 months after the effective date
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Affected Aircraft
McDonnell Douglas Model MD-90-30 series airplanes listed in Service Bulletin MD90-27-026, 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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