AD Amdt-39-11686
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Various | Transport Category | Airworthiness Directives; Various Transport Category Airplanes Equipped with Mode “C” Transponder(s) with Single Gillham Code Altitude Input |
Unsafe Condition
Discrepancies of the Mode 'C' transponder(s), air data computer, and certain wiring connections could result in false advisories directing flightcrew to change course or altitude, leading to deviation from assigned flight path and possible mid-air collision.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
None required as this AD rescinds the previous requirements for repetitive tests and corrective actions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Various transport category airplanes equipped with Mode 'C' transponder(s) with single Gillham code altitude input, previously covered under AD 99-23-22 R1.
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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