AD 90-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
Inability to fully open and close the outboard engine fuel shutoff valve due to the outboard engine fuel shutoff valve actuator bonding wire issue.
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Required Actions
Replace the outboard engine fuel shutoff valve actuator bonding wire within 30 days after the effective date of this AD. Report findings of wires longer than six inches within 10 days after modification completion. Submit alternate compliance requests through an FAA PMI to the Seattle Aircraft Certification Office.
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Compliance Time
Within the next 30 days after the effective date of this AD
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Affected Aircraft
Boeing Model 747-400 series airplanes equipped with Pratt and Whitney PW4000 series engines or Rolls Royce RB211-524 series engines, identified in Boeing Alert Service Bulletin 747-28A2143 dated April 19, 1990.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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