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Piper Aircraft Radio Compliance

This document is an amendment from Piper Aircraft Corporation regarding control wheel push-to-talk switches on certain Piper aircraft models. It requires within 10 hours of the effective date to disconnect the muting relay plug from the radio harness. Within 100 hours it requires removing a 22 mfd capacitor from the muting relay and installing a diode as shown in the diagram to prevent disruption of radio communication. It applies to various Piper aircraft models produced between certain serial numbers.

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121 views2 pages

Piper Aircraft Radio Compliance

This document is an amendment from Piper Aircraft Corporation regarding control wheel push-to-talk switches on certain Piper aircraft models. It requires within 10 hours of the effective date to disconnect the muting relay plug from the radio harness. Within 100 hours it requires removing a 22 mfd capacitor from the muting relay and installing a diode as shown in the diagram to prevent disruption of radio communication. It applies to various Piper aircraft models produced between certain serial numbers.

Uploaded by

Yarisa Vange
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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80-14-03

PIPER AIRCRAFT CORPORATION


Amendment: 39-3810
Applicability:
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‐~85 105

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‐8029001 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 thìs 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 AC 43.13-1A.

(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-32-300, 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.

< VIEW IMAGE >FIGURE 1

< VIEW IMAGE >[See FAA Letter regarding this document.]

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