AD 99-21-28
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A319-111 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A319-112 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A319-113 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A319-114 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A319-131 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A319-132 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A320-111 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A320-211 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A320-212 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
| aircraft | Airbus | A320-214 | Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped with AlliedSignal RIA-35B Instrument Landing System Receivers |
Unsafe Condition
Faulty AlliedSignal RIA-35B ILS receivers may display erroneous glide slope deviation or localizer deviation, potentially causing landing outside the runway's lateral boundary.
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Required Actions
Replace all RIA-35B ILS receivers with modified units per Service Bulletin M-4431 within 6 months of effective date. Revise AFM to include procedures for handling ILS fault cautions and comparing receiver deviations during approaches. Remove and replace faulty receivers displaying ECAM cautions within 10 days of detection.
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Compliance Time
Within 6 months after November 22, 1999, and within 10 days of detecting faults as specified.
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Affected Aircraft
Airbus Model A319, A320, A321, A330, and A340 series airplanes equipped with AlliedSignal RIA-35B ILS receivers P/N 066-50006-0202, excluding those with modified P/N 066-50006-1202.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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