Airworthiness directives › 2004-21-04
AD 2004-21-04 Airworthiness Directives; Becker Flugfunkwerk GmbH AR 4201 VHF AM Transceivers
Applicability*9
This AD applies to Becker Flugfunkwerk GmbH AR 4201 VHF AM transceivers, with serial numbers (SNs) 0150 through 9499.
Compliance
You are responsible for having the actions required by this AD performed within five days after the effective date of this AD, unless the actions have already been done. (f) For installed Becker Flugfunkwerk GmbH AR 4201 VHF AM transceivers, inspect the SN. If the transceiver does not have an affected SN, no further action is required. (g) If the transceiver has an affected SN, and does not have Change Index 02 or higher index number marked on it, do the following: (1) Add an aircraft flight manual (AFM) limitation to the Limitations Section of the AFM, that restricts transceiver usage to VFR operations, and add a placard to the cockpit within view of the pilot that states, in 1/4 inch-high or higher characters, “Use of Becker Comm Equipment AR 4201 is restricted to VFR operations”; or (2) Remove the transceiver from service. (h) After the effective date of this AD, do not install any Becker Flugfunkwerk GmbH AR 4201 VHF AM transceiver with an affected SN that does not have Change Index 02 or higher index number marked on it, unless it was removed to determine the SN or to check for Change Index 02 or higher index number. Terminating Action (i) If you later install a transceiver that is not listed in this AD or install a transceiver that is marked with Change Index 02 or higher index number, remove the limitation from the Limitations Section of the AFM, and placard if present, that are specified in paragraph (g)(1). Alternative Methods of
Unsafe condition
This AD results from reports of crewmembers having difficulty communicating with Air Traffic Control and other aircraft due to the AR 4201 VHF AM transceiver's inability to block interference from transmitters operating on frequencies other than those set in the transceiver. We are issuing this AD to prevent difficulty in communicating with Air Traffic Control and other aircraft due to intermittent malfunctioning of the transceiver.
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