AD Amdt-39-10643
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-400 | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
Unsafe Condition
Errors in the glide slope deviation provided by an ILS receiver could result in a landing outside the lateral boundary of the runway.
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Required Actions
Revise the Airplane Flight Manual (AFM) to prohibit certain approaches with only one operational ILS receiver. Conduct repetitive inspections to detect faults in RIA-35B ILS receivers and replace discrepant units. Alternatively, revise the AFM, install a placard to prohibit certain operations, and forgo inspections by selecting optional terminating actions.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747-400, 757, 767, and 777 series airplanes equipped with AlliedSignal RIA-35B ILS receivers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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