80-14-03 PIPER AIRCRAFT CORPORATION: Amendment 39-3810. Applies to the following airplanes certificated in all categories equipped with Bendix, King or Narco transmitters with factory installed control wheel push-to-talk switches. \n\n\nModels Affected\nSerial Numbers Affected \nPA-28-161 Warrior II\n28-7816001 through 28-8016289 \nPA-28-181 Archer II\n28-7890001 through 28-8090266 \nPA-28-201T Turbo Dakota\n28-7921001 through 28-7921091 \nPA-28-236 Dakota\n28-7911001 through 28-8011096\nPA-28R-201 Arrow III\n28R-7837001 through 28R-7837317 \nPA-28RT-201 Arrow IV\n28R-7918001 through 28R-8018049 \nPA-28R-201T Turbo Arrow III\n28R-7803001 through 28R-7803373 \nPA-28RT-201T Turbo Arrow IV\n28R-7931001 through 28R-8031074 \nPA-32-260 Six\n32-7800001 through 32-7800008\nPA-32-300 Six 300\n32-7840001 through 32-7940290 \nPA-32-301 Saratoga\n32-8006001 through 32-8006015 \nPA-32-301T Turbo Saratoga\n32-8024001 through 32-8024007 \nPA-32R-300 Lance\n32-7880001 through 32-7880068 \nPA-32RT-300 Lance II\n32R-7885001 through 32R-7985105\nPA-32RT-300T Turbo Lance II\n32R-7787001, 32R-7887002 through 32R-7987126 \nPA-32R-301 Saratoga SP\n32R-8013001 through 32R-8013071 \nPA-32R-301T Turbo Saratoga SP\n32R-802900 1 through 32R-8029068 \nPA-34-200T Seneca II\n34-7870001 through 34-8070150 \nPA-44-180 Seminole\n44-7995001 through 44-8095020 \n\n\tCompliance is required as indicated unless already accomplished to prevent disruption of radio communication. \n\n\t(a)\tWithin the next 10 hours time in service after the effective date of this AD, comply with the following: \n\n\t\t(1)\tLocate the audio adapter connector in the main radio harness behind the radio stack. This is the interconnect for individual radios in the audio selector panel. \n\t\n\t\t(2)\tLocate the muting relay plug in this connector. It is a three (3) pin plug containing wires ASP-1, ASP-2, and ASP-3 and is positioned at one end of the adapter connector. \n\n\t\t(3)\tDisconnect the muting relay plug and attach securely to the harness in accordance with Advisory Circular AC43.13-1A. \n\n\t\t(4)\tConduct complete operational check of all radios. \n\n\t\t(5)\tMake a maintenance record entry. \n\n\t(b)\tWithin the next 100 hours time in service after the effective date of this AD, comply with the following: \n\n\t\t(1)\tOn PA-32-260, PA-32-3O0, PA-32-301, PA-32-301T, PA-32R-300, PA- 32RT-300, PA-32RT-300T, PA-32R-301, PA-32R-301T and PA-34-200T model aircraft gain access by removing four (4) screws from the speaker grille ring. On all other affected models, gain access by lowering the overhead dome panel. \n\n\t\t(2)\tRemove the 22 mfd capacitor, part number 454-045, soldered to the muting relay, noting polarity, and install diode as shown in figure 1. Diode is not required on Bendix avionics systems. \n\n\t\t(3)\tReconnect the muting relay plug and conduct radio check for proper operation. \n\n\t\t(4)\tMake a maintenance record entry. \n\n\tPiper Service Bulletin No. 681 applies to the same subject. \n\n\tAny equivalent method of compliance with this Airworthiness Directive may be approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region. \n\n\tThis amendment becomes effective July 1, 1980.