AD 2004-10-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, 747-400D, 747-400F, 757-200, 757-200PF, 757-200CB, 767-200, 767-300, and 767-300F Series Airplanes |
Unsafe Condition
A persistent erroneous overspeed or stall aural warning could confuse and distract the flightcrew, leading to an increase in workload and potential action on hazardously misleading information, which could result in loss of control of the airplane.
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Required Actions
Install new circuit breakers, relays, and related components, and make various wiring changes in and between the flight deck and main equipment center. For certain airplanes, also accomplish other actions prior to or concurrently with the ADC system modification. Operators may choose to perform an optional interim action within 18 months, followed by the full modification within 72 months, or complete the full modification within 24 months.
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Compliance Time
Within 24 months after the effective date, or within 72 months after the effective date if the optional interim action is completed within 18 months.
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Affected Aircraft
Boeing Model 747-400, 747-400D, 747-400F, 757-200, 757-200PF, 757-200CB, 767-200, 767-300, and 767-300F series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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