AD 99-10-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 757-200 Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 757-200CB Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 757-200PF Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 757-300 Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 767-200 Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 767-300 Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
| aircraft | The Boeing Company | 767-300F Series | Airworthiness Directives; Boeing Model 747-400, 757, 767, and 777 Series Airplanes |
Unsafe Condition
Erroneous localizer deviation provided by faulty ILS receivers could result in a landing outside the lateral boundary of the runway.
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Required Actions
Replace all existing RIA-35B ILS receivers (P/N 066-50006-0101) with modified units (P/N 066-50006-1101) per AlliedSignal Service Bulletin M-4426 within 6 months of AD effective date. Previously, inspections for fault codes 'Nl'/'Nm' were required every 64 flight cycles, with replacement of discrepant receivers. AFM revisions and placards prohibiting certain approaches were also mandated.
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Compliance Time
Within 6 months after the effective date of this AD
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Affected Aircraft
Boeing Model 747-400, 757, 767, and 777 series airplanes equipped with AlliedSignal RIA-35B ILS receivers, P/N 066-50006-0101.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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