AD 91-03-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747-400 Series Airplanes |
Unsafe Condition
Inadvertent reversal of direction of flight due to the flight management system commanding an unanticipated turn to intercept an out-of-sequence waypoint.
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Required Actions
Install placards on or adjacent to both left and right Control Display Units (CDU) stating 'Use of ABEAM PTS FMC Function Prohibited'. Revise the AFM's Limitations Section, Electronics Subsection, to add 'Do not use the FMC ABEAM PTS Function'.
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Compliance Time
within 30 days after the effective date of this AD, unless previously accomplished
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Affected Aircraft
All Model 747-400 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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