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Airworthiness Directives; COLLINS RADIO: Applies to All Model 51R-1 and 51R-2 Receivers Incorporating Allite or Thordarson 90/150 Cycle Filters in Their Tone Localizer Indicator Circuits and to All Model 51R-1 Receivers Which Have Not Been Modified in Accordance With Collins 51R-1 Service Bulletin Number 7a

Unsafe Condition: Receivers

Why matched: Airworthiness Directives; COLLINS RADIO: Applies to All Model 51R-1 and 51R-2 Receivers Incorporating Allite or Thordarson 90/150 Cycle Filters in Their Tone Localizer Indicator Circuits and to All Model 51R-1 Receivers Which Have Not Been Modified in Accordance With Collins 51R-1 Service Bulletin Number 7a

Airworthiness Directives; COLLINS RADIO: Applies to All Models 51R-1 and 51R-2 Radio Receivers

Unsafe Condition: Radio Receivers

Why matched: Airworthiness Directives; COLLINS RADIO: Applies to All Models 51R-1 and 51R-2 Radio Receivers