# Airworthiness Directives; Airbus Model A319, A320, A321, A330, and A340 Series Airplanes Equipped With AlliedSignal RIA-35B Instrument Landing System Receivers
> **Rule** · Final rule. · Published 1999-10-18 · Effective 1999-11-22 · 64 FR 56159
## Document
- **Document number:** 99-26865
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 56159
- **Publication date:** 1999-10-18
- **Effective date:** 1999-11-22
- **FAA docket:** Docket No. 99-NM-25-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Airbus Model A319, A320, A321, A330, and A340 series airplanes, that currently requires revising the Airplane Flight Manual (AFM) to require the flightcrew to discontinue use of any Instrument Landing System (ILS) receiver for which a certain caution message is displayed. It also requires, for certain airplanes, replacing any faulty ILS receiver with a new, serviceable, or modified unit, and provides for optional terminating action for the AFM revisions. This amendment requires accomplishment of the previous optional terminating action. This amendment is prompted by a pilot's report of errors in the glide slope deviation provided by an ILS receiver. The actions specified by this AD are intended to detect and correct faulty ILS receivers and to ensure that the flightcrew is advised of the potential hazard of performing ILS approaches using a localizer deviation from a faulty ILS receiver, and advised of the procedures necessary to address that hazard. An erroneous localizer deviation could result in a landing outside the lateral boundary of the runway.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/10/18/99-26865/airworthiness-directives-airbus-model-a319-a320-a321-a330-and-a340-series-airplanes-equipped-with)
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