# AD 52-13-01: Radio Receivers

- Type: Airworthiness directive
- Status: Current
- Products: Collins Radio Receivers
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/51ACBCF06287653C86256A320060A167.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/52-13-01

## The airworthiness directive

52-13-01 COLLINS RADIO: Applies to All Models 51R-1 and 51R-2 Radio Receivers.

Compliance required by November 1, 1952.

To eliminate failures of 90/150 cycle tone localizer filters due to electrodeposition of copper from the coil windings to the laminated iron core, 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.

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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