AD Amdt-39-11167
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 (ILS) 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 types of approaches. Install a placard to prohibit certain operations. Replace discrepant ILS receivers with new, serviceable, or modified units.
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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 Instrument Landing System (ILS) receivers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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