AD 2002-06-06

final rule
Data completeness: 70%

Airworthiness Directives; Rockwell Collins, Inc. TDR-94 and TDR-94D Mode S Transponders

AD Number
2002-06-06
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. 2000-CE-32-AD
FR Citation
67 FR 13564

Unsafe Condition

Erroneous altitude reporting from Rockwell Collins TDR-94 and TDR-94D Mode S transponders when deriving altitude information from a Gillham (gray code) encoded pressure altitude source, which could lead to reduced ACAS or TCAS Change 7 separation margins.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Modify the unit to prevent erroneous altitude reporting.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight.

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Affected Aircraft

Rockwell Collins TDR-94 and TDR-94D Mode S transponders installed on airplanes, specifically those deriving altitude information from a Gillham (gray code) encoded pressure altitude source.

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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