# AD 80-14-03: Bendix, King or Narco Transmitters - Type: Airworthiness directive - Status: Current - Products: Piper PA-28-161, PA-28-181, PA-28-201T, PA-28-236, PA-28R-201, PA-28R-201T, PA-28RT-201, PA-28RT-201T, PA-32-260, PA-32-300, PA-32-301, PA-32-301T and 7 more - Effective: July 1, 1980 - Published: June 30, 1980 - Issued: June 16, 1980 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-3810 - Registered aircraft: 11,747 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8FE0030A824B3622862569A6005CCDB2.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/80-14-03 ## The airworthiness directive 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. Models Affected Serial Numbers Affected PA-28-161 Warrior II 28-7816001 through 28-8016289 PA-28-181 Archer II 28-7890001 through 28-8090266 PA-28-201T Turbo Dakota 28-7921001 through 28-7921091 PA-28-236 Dakota 28-7911001 through 28-8011096 PA-28R-201 Arrow III 28R-7837001 through 28R-7837317 PA-28RT-201 Arrow IV 28R-7918001 through 28R-8018049 PA-28R-201T Turbo Arrow III 28R-7803001 through 28R-7803373 PA-28RT-201T Turbo Arrow IV 28R-7931001 through 28R-8031074 PA-32-260 Six 32-7800001 through 32-7800008 PA-32-300 Six 300 32-7840001 through 32-7940290 PA-32-301 Saratoga 32-8006001 through 32-8006015 PA-32-301T Turbo Saratoga 32-8024001 through 32-8024007 PA-32R-300 Lance 32-7880001 through 32-7880068 PA-32RT-300 Lance II 32R-7885001 through 32R-7985105 PA-32RT-300T Turbo Lance II 32R-7787001, 32R-7887002 through 32R-7987126 PA-32R-301 Saratoga SP 32R-8013001 through 32R-8013071 PA-32R-301T Turbo Saratoga SP 32R-802900 1 through 32R-8029068 PA-34-200T Seneca II 34-7870001 through 34-8070150 PA-44-180 Seminole 44-7995001 through 44-8095020 Compliance is required as indicated unless already accomplished to prevent disruption of radio communication. (a) Within the next 10 hours time in service after the effective date of this AD, comply with the following: (1) Locate 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. (2) Locate 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. (3) Disconnect the muting relay plug and attach securely to the harness in accordance with Advisory Circular AC43.13-1A. (4) Conduct complete operational check of all radios. (5) Make a maintenance record entry. (b) Within the next 100 hours time in service after the effective date of this AD, comply with the following: (1) On 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. (2) Remove 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. (3) Reconnect the muting relay plug and conduct radio check for proper operation. (4) Make a maintenance record entry. Piper Service Bulletin No. 681 applies to the same subject. Any equivalent method of compliance with this Airworthiness Directive may be approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region. This amendment becomes effective July 1, 1980. ## Affected data sheets (4) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A3SO](https://openairdocs.org/tcds/A3SO): Piper Aircraft Inc.; names 9 of 13 models: PA-32-300, PA-32-301, PA-32R-300, PA-32-260, PA-32-301T, PA-32RT-300, PA-32R-301T, PA-32R-301 (SP)… - [TCDS 2A13](https://openairdocs.org/tcds/2A13): Piper Aircraft Inc.; names 8 of 18 models: PA-28R-201, PA-28-201T, PA-28-236, PA-28R-201T, PA-28-161, PA-28RT-201, PA-28-181, PA-28RT-201T - [TCDS A19SO](https://openairdocs.org/tcds/A19SO): Piper Aircraft Inc.; names 1 of 2 models: PA-44-180 - [TCDS A7SO](https://openairdocs.org/tcds/A7SO): Piper Aircraft Inc.; names 1 of 5 models: PA-34-200T (Seneca II) ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 11,747 (11,747 by airframe model, 0 by engine model) - Makers: Piper 11,687, New Piper 60 Models with the most aircraft: - [Piper PA-28-181](https://openairdocs.org/model/piper-pa-28-181): 3,549 aircraft (airframe model) - [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 1,526 aircraft (airframe model) - [Piper PA-32-300](https://openairdocs.org/model/piper-pa-32-300): 992 aircraft (airframe model) - [Piper PA-32-260](https://openairdocs.org/model/piper-pa-32-260): 650 aircraft (airframe model) - [Piper PA-34-200T](https://openairdocs.org/model/piper-pa-34-200t): 563 aircraft (airframe model) - [Piper PA-44-180](https://openairdocs.org/model/piper-pa-44-180): 558 aircraft (airframe model) - [Piper PA-32R-301T](https://openairdocs.org/model/piper-pa-32r-301t): 536 aircraft (airframe model) - [Piper PA-32R-300](https://openairdocs.org/model/piper-pa-32r-300): 510 aircraft (airframe model) - [Piper PA-28-236](https://openairdocs.org/model/piper-pa-28-236): 480 aircraft (airframe model) - [Piper PA-32R-301](https://openairdocs.org/model/piper-pa-32r-301): 456 aircraft (airframe model) - [Piper PA-28R-201T](https://openairdocs.org/model/piper-pa-28r-201t): 368 aircraft (airframe model) - [Piper PA-28R-201](https://openairdocs.org/model/piper-pa-28r-201): 352 aircraft (airframe model) - [Piper PA-28RT-201T](https://openairdocs.org/model/piper-pa-28rt-201t): 255 aircraft (airframe model) - [Piper PA-32RT-300T](https://openairdocs.org/model/piper-pa-32rt-300t): 204 aircraft (airframe model) - [Piper PA-32RT-300](https://openairdocs.org/model/piper-pa-32rt-300): 200 aircraft (airframe model) - [Piper PA-28RT-201](https://openairdocs.org/model/piper-pa-28rt-201): 178 aircraft (airframe model) - [Piper PA-32-301](https://openairdocs.org/model/piper-pa-32-301): 167 aircraft (airframe model) - [Piper PA-32-301T](https://openairdocs.org/model/piper-pa-32-301t): 81 aircraft (airframe model) - [Piper PA-28-201T](https://openairdocs.org/model/piper-pa-28-201t): 62 aircraft (airframe model) - [New Piper PA-32R-301T](https://openairdocs.org/model/new-piper-pa-32r-301t): 19 aircraft (airframe model) All 29 models: https://openairdocs.org/ad/80-14-03/models.md Every aircraft: https://openairdocs.org/ad/80-14-03/aircraft.md ## Related documents - [AC 43.13-1B CHG 1 Ed Update](https://openairdocs.org/ac/43.13-1): Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair. Cited as AC 43.13-1A in the AD's requirements --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.