AD NUMBER: 2004-21-04 MANUFACTURER: VHF AM Transceivers SUBJECT: Airworthiness Directive 2004-21-04 SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Becker Flugfunkwerk GmbHAR 4201 VHF AM
transceivers. This AD requires adding an aircraft flight manual
(AFM) limitation to the Limitations Section of the AFM, and cockpit
placard due to the intermittent malfunctioning of the transceiver,
or removing the affected transceiver from service. 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.