AD Amdt-39-10637

final rule
Data completeness: 70%

Airworthiness Directives; AlliedSignal Inc. KT 76A Air Traffic Control (ATC) Transponders

AD Number
Amdt-39-10637
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. 97-CE-30-AD
FR Citation
63 FR 35787

Unsafe Condition

The KT 76A ATC transponders may transmit misleading encoding altimeter information to ground-based ATC radar sites and nearby TCAS-equipped aircraft due to inability to coordinate.

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

Required Actions

Replace two resistor network modules with glass-coated modules to prevent transmission of misleading altimeter data.

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

Compliance Time

Before further flight

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

Affected Aircraft

AlliedSignal Inc. KT 76A ATC transponders installed on aircraft

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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View Official Source ↗