AD 52-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Collins Radio | Receivers | Airworthiness Directives; COLLINS RADIO: Applies to All Models 51R-1 and 51R-2 Radio Receivers |
Unsafe Condition
Failures of 90/150 cycle tone localizer filters due to electrodeposition of copper from the coil windings to the laminated iron core.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the receiver in accordance with Collins 51R-1 and -2 Service Bulletin No. 21, dated May 7, 1952, by removing the B plus voltage from the 90 and 150 cycle filter input circuits.
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Compliance Time
November 1, 1952
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Affected Aircraft
Collins Radio Models 51R-1 and 51R-2 Radio Receivers
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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