AD 91-06-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
Failure of either pilot's electronic flight instrument system (EFIS) control panel, resulting in smoke in the flight deck.
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Required Actions
Inspect both EFIS control panels within 90 days after the effective date to record serial numbers and modification status. Remove and modify control panels with serial numbers identified in Collins Service Bulletin DCP-7000-31-04 (dated December 1, 1989) that lack Modification 4 before further flight. Modify such panels in accordance with the service bulletin before installation.
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Compliance Time
Within 90 days after the effective date of this AD
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Affected Aircraft
Boeing Model 747-400 series airplanes through line number 791, 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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