KX 155 Installation Manual: Article Plan
This comprehensive guide details the installation of the KX 155/165 VHF NAV/COMM transceiver, covering everything from initial setup to troubleshooting, ensuring optimal performance and longevity.
The Bendix/King KX 155 is a highly reliable and versatile VHF NAV/COMM transceiver, widely utilized in general aviation. This installation manual provides detailed instructions for aviation technicians and qualified personnel responsible for integrating this unit into aircraft. It covers the complete process, from unpacking and inspection to final system testing and troubleshooting.
The KX 155 combines communication and navigation functionalities, offering both voice transmission/reception and VOR/LOC/Glideslope capabilities. Proper installation is crucial for ensuring accurate navigation and clear communication, adhering to all applicable aviation regulations and safety standards. This manual references TSOd systems (section 1.7.6) and includes specific notes for the KX 155A variant, alongside a specifications comparison with the KX 165.
Safety Precautions
Prior to commencing any installation work on the KX 155, disconnect the aircraft’s main battery and ensure the area is free from flammable materials. Always wear appropriate personal protective equipment, including safety glasses and insulated gloves. Incorrect wiring or installation can create fire hazards or compromise aircraft systems.
Exercise extreme caution when working with aircraft electrical systems. Verify proper grounding to prevent short circuits. As with all avionics, the KX 155 should be powered on only after engine start-up and powered off before engine shutdown to protect solid-state circuitry and extend operational life. This manual is intended for qualified personnel; improper installation voids warranties and may create unsafe operating conditions. Refer to aircraft maintenance manuals for specific procedures.
Required Tools and Equipment
Successful KX 155 installation necessitates a specific toolkit. Essential items include a properly insulated screwdriver set, wire strippers, crimping tools for coaxial and standard wiring, and a digital multimeter for continuity and voltage checks. A panel cutout tool, matching the specified dimensions, is crucial for a clean installation.
Coaxial cable with appropriate connectors (typically 50 Ω impedance) is required for antenna connections. Standard aviation wire, heat shrink tubing, and cable ties will ensure secure and organized wiring. Access to the aircraft’s maintenance manual and wiring diagrams is vital. Finally, a static dissipative wrist strap is recommended to protect sensitive electronic components during handling and installation.
Unpacking and Inspection
Upon receiving the KX 155, carefully inspect the shipping container for any signs of damage during transit. Document any external damage immediately with photographs. Once opened, verify that all components listed on the packing list are present, including the transceiver unit, mounting hardware, and any optional accessories.
Thoroughly examine the unit itself for physical damage such as dents, scratches, or broken connectors. Check the coaxial connectors and wiring harnesses for any defects. If any damage or missing components are discovered, immediately contact the supplier and do not attempt installation. Retain all packaging materials for potential return or claim processing.
System Overview
The KX 155 is a versatile VHF NAV/COMM transceiver designed for general aviation applications. It combines communication and navigation functionalities into a single unit, offering both voice transmission/reception and VOR/LOC/Glideslope navigation capabilities. The system utilizes both horizontally and vertically polarized antennas for optimal signal reception.
Proper operation requires compatible headphones (500 Ωs nominal impedance) and a low impedance carbon or dynamic microphone with a transistorized pre-amp. The unit is designed to interface with existing avionics systems, potentially utilizing Bendix/King serial code for integration. Careful attention to power requirements is crucial for reliable performance and longevity of the equipment.
Antenna Connections
The KX 155 requires two coaxial cable connections: one for the communications antenna and one for the navigation antenna. Utilize broadband 50 Ω coaxial cables for both. The communications antenna should be vertically polarized for optimal transmit and receive performance. Conversely, the navigation antenna should be horizontally polarized to effectively receive VOR, LOC, and Glideslope signals.
Ensure proper impedance matching between the antenna, coaxial cable, and the KX 155 transceiver to minimize signal loss and standing wave ratio (SWR). Secure connections are vital to prevent signal interference and maintain reliable communication and navigation. Incorrect antenna polarization can significantly degrade system performance.
Headphone and Microphone Specifications
The KX 155 is compatible with a range of headphones and microphones, however, specific impedance requirements must be met for optimal audio clarity and performance. Headphones should have a nominal impedance of 500 Ωs. This ensures adequate audio level and prevents distortion; For microphones, low impedance carbon or dynamic types are recommended, particularly those equipped with a transistorized pre-amplifier.
Using incompatible headphones or microphones can result in low audio volume, distorted sound, or even damage to the transceiver’s audio circuitry. Ensure proper wiring and secure connections to maintain clear communication. Verify microphone sensitivity settings for optimal audio input levels.
Power Requirements
The KX 155 operates on a 12-28 Volt DC power source, typical of most general aviation aircraft electrical systems. Proper voltage regulation is crucial for reliable operation and to prevent damage to the unit’s sensitive electronic components. It’s essential to verify the aircraft’s power supply falls within this specified range before installation.
Avoid exceeding the maximum voltage limit, as this can lead to premature failure. As with all avionics, the KX 155 should be powered on after engine start-up and powered off before engine shutdown. These precautions protect the solid-state circuitry and extend the equipment’s operational lifespan. Ensure adequate circuit protection (fusing) is in place.
Installation Location Considerations
Selecting an appropriate installation location is paramount for optimal KX 155 performance. The unit should be mounted in a location that provides adequate ventilation to prevent overheating, and shielded from extreme temperatures and moisture. Avoid areas directly exposed to engine exhaust or hydraulic fluid leaks.
Consider accessibility for future maintenance and servicing. Ensure sufficient space is available for all necessary wiring connections and antenna cable routing. The mounting location must also comply with applicable aviation regulations regarding equipment placement and accessibility for pilots. Proper grounding is essential to minimize interference and ensure system stability. Vibration levels should also be considered during site selection.
Mounting the KX 155
Securely mounting the KX 155 is crucial for reliable operation. Begin by verifying the selected location meets the dimensional requirements outlined in the Panel Cutout Dimensions section. Ensure the mounting surface is flat and structurally sound to support the unit’s weight and withstand vibration during flight.
Utilize appropriate hardware, such as screws and washers, specified for aviation applications. Avoid over-tightening, which could damage the unit or the mounting structure. Confirm the unit is firmly secured and does not exhibit any movement. Proper grounding during mounting is vital for minimizing interference. Double-check all connections before proceeding to the wiring stage.
Panel Cutout Dimensions
Precise panel cutout dimensions are essential for a flush and secure KX 155 installation. Refer to the detailed diagrams within the installation manual for exact measurements. Typically, the required rectangular opening measures [Insert Specific Width] inches in width and [Insert Specific Height] inches in height. Depth requirements behind the panel should also be carefully considered to accommodate wiring and connectors.
Ensure the cutout is clean and free of burrs or sharp edges that could damage the unit or interfere with proper seating. A properly sized cutout prevents stress on the mounting hardware and ensures optimal heat dissipation. Incorrect dimensions may necessitate panel modification, potentially compromising structural integrity.
Securing the Unit
After creating the panel cutout, securely mounting the KX 155 is crucial for reliable operation; Utilize the provided mounting brackets and screws, ensuring they are appropriate for the aircraft’s panel material and thickness. Tighten the screws evenly to avoid warping the panel or damaging the unit’s housing.
Avoid over-tightening, as this can strip the threads or create undue stress on the internal components. Verify the unit is firmly seated and does not exhibit any wobble or movement. Proper securing minimizes vibration-induced failures and maintains consistent electrical connections. Double-check all fasteners post-installation to guarantee a robust and lasting mount.
Wiring Diagram
The KX 155 requires careful wiring for proper functionality and safety. A typical installation involves connections for power (typically 12V DC, negative ground), antenna inputs for both communication and navigation (50 Ω impedance), and connections for headphones and a microphone.
Refer to the detailed wiring schematics included in the full installation manual for precise pin assignments and color coding. Ensure all wiring conforms to aviation standards and utilizes appropriate gauge wire for the current draw. Proper grounding is essential to minimize interference and ensure stable operation. Incorrect wiring can lead to system malfunction or damage, so meticulous attention to detail is paramount.
Antenna Installation
Optimal performance of the KX 155 relies heavily on correct antenna installation. The system utilizes two coaxial cable connections: one for the communication antenna and another for the navigation antenna. Both antennas should be broadband, 50 Ω impedance, and appropriately polarized.
For vertical polarization, ensure the antenna is mounted securely and clear of obstructions. Horizontal polarization requires careful consideration of aircraft geometry to minimize signal loss. Coaxial cable routing must avoid sharp bends and maintain consistent impedance throughout the run. Proper VSWR (Voltage Standing Wave Ratio) checks are crucial after installation to verify antenna efficiency and prevent damage to the transceiver.
Broadband 50 Ω Vertical Antenna
Utilizing a broadband 50 Ω vertically polarized communications antenna is essential for reliable KX 155 operation. This antenna type provides omnidirectional coverage, crucial for general aviation communication. Mounting should prioritize a clear, unobstructed path for signal transmission, avoiding interference from airframe components or other antennas.
Coaxial cable connection must be secure and weatherproofed to prevent signal degradation. Ensure the cable is properly grounded to minimize static discharge and noise. Regularly inspect the antenna and coaxial cable for damage, corrosion, or loose connections. Proper installation and maintenance of the vertical antenna will maximize communication range and clarity.
Broadband 50 Ω Horizontal Antenna
For optimal navigation performance, a broadband 50 Ω horizontally polarized navigation antenna is recommended for the KX 155. This antenna configuration excels at receiving signals from ground-based VOR and ILS stations. Careful consideration must be given to antenna placement, ensuring it’s mounted to provide a clear line of sight to these navigational aids.
Employing high-quality coaxial cable and secure connections is paramount to minimize signal loss. Proper grounding is also vital for reducing interference. Regularly inspect the antenna for physical damage and ensure all connections remain tight and corrosion-free. A well-installed horizontal antenna significantly enhances the accuracy and reliability of navigation data received by the KX 155.
Connecting Headphones and Microphone
Proper connection of headphones and a microphone is crucial for clear communication and audio monitoring with the KX 155. The system is designed to work with headphones possessing a nominal impedance of 500 Ωs, ensuring optimal audio levels and fidelity. For microphone input, either a low impedance carbon or dynamic microphone, equipped with a transistorized pre-amp, is suitable.
Ensure secure connections to the designated audio jacks on the KX 155. Verify microphone functionality by testing voice transmission and headphone clarity during operation. Poor connections can result in distorted audio or complete signal loss. Regularly inspect cables for wear and tear, replacing them as needed to maintain consistent audio quality.
Powering Up the System
Following proper power-up procedures is essential for protecting the KX 155’s solid-state circuitry and maximizing its operational lifespan. As with all avionics equipment, the KX 155 should be activated only after the engine has been successfully started. This prevents potential damage from voltage fluctuations during the engine start sequence.
Similarly, it’s recommended to power down the KX 155 before initiating engine shutdown. These simple precautions safeguard the sensitive electronic components within the unit. Verify the correct voltage supply is connected, adhering to the power requirements outlined in the specifications. A stable power source ensures reliable performance and prevents unexpected system behavior.
Initial System Testing
After powering up, a thorough system test is crucial to verify correct functionality of the KX 155. Begin by checking the VOR, LOC (Localizer), and Glideslope indicators. Ensure they respond appropriately to simulated signals or known navigation aids. Confirm accurate frequency tuning and signal strength indication across the VHF band.
For installations involving TSOd (Technical Standard Order) systems, refer to section 1.7.6 of the complete documentation for specific compliance requirements and testing procedures. Pay close attention to any potential interference or spurious emissions. Verify proper headphone and microphone operation, confirming clear audio transmission and reception. Document all test results for future reference and maintenance records.
VOR, LOC, and Glideslope Indicators
Proper operation of the VOR, LOC, and Glideslope indicators is paramount for safe navigation. During initial testing, verify that the VOR indicator accurately displays received station identification and signal strength. The LOC indicator should center and remain stable when locked onto a localizer signal, providing precise course guidance.
Similarly, the Glideslope indicator must track and display the correct vertical descent path during an instrument approach. Observe for any erratic behavior, sluggish response, or false indications. Ensure sensitivity adjustments are appropriate for the installed antenna system. Refer to the full installation manual for detailed troubleshooting steps if any anomalies are detected in these critical navigation indicators.
TSOd Systems Considerations (Section 1.7.6 Reference)
When integrating the KX 155 into Technically Standard Order (TSO) approved systems, strict adherence to Section 1.7.6 of the installation manual is crucial. This section details specific requirements for compatibility and performance to maintain airworthiness. Particular attention should be paid to antenna impedance matching, ensuring a proper 50 Ω connection for both vertical and horizontal polarization.
Verify that all wiring conforms to applicable aviation standards and that the system doesn’t introduce interference with other avionics. Thoroughly document all installation details, including component serial numbers and test results, for future maintenance and regulatory compliance. Failure to comply with TSOd guidelines may invalidate the aircraft’s certification.
Bendix/King Serial Code Integration
Proper integration of the Bendix/King serial code is essential for full functionality and communication within a compatible avionics suite. The KX 155 utilizes this code for data exchange with external control heads and other Bendix/King components. During installation, carefully verify the serial code programmed into the unit matches the aircraft’s documentation and the connected avionics.
Incorrect serial code configuration can lead to communication errors, display inaccuracies, or even system failures. Refer to the KX 155 installation manual for detailed instructions on accessing and modifying the serial code settings. Ensure the code is entered accurately and saved correctly to avoid future issues. Proper integration streamlines system operation and enhances overall reliability.
KX 155A Specific Installation Notes
The KX 155A model incorporates minor enhancements over the original KX 155, requiring specific attention during installation. While largely compatible with existing wiring and mounting configurations, installers should verify software revisions to ensure optimal performance. Pay close attention to any updated grounding requirements outlined in the KX 155A supplement to the main installation manual.
Specifically, confirm compatibility with the aircraft’s power supply and antenna systems. The KX 155A may exhibit slightly different impedance characteristics. Thoroughly test all functions – VOR, LOC, and Glideslope – post-installation. Refer to section 1.7.6 for TSOd systems considerations. Adhering to these notes guarantees a smooth and reliable installation of the KX 155A.
Troubleshooting Common Installation Issues
Several issues can arise during KX 155 installation; proper diagnosis is crucial. A frequent problem involves incorrect grounding, leading to noise or instability. Verify all ground connections, ensuring low impedance paths. Another common issue is antenna mismatch, resulting in reduced range or signal strength. Confirm correct antenna cable type and length, and check for VSWR.
If the unit fails to power on, inspect the power supply voltage and wiring. Intermittent operation can indicate loose connections or faulty wiring harnesses. For VOR/LOC/Glideslope indicator problems, double-check antenna connections and signal path integrity. Remember to consult the full installation manual and relevant TSOd system guidelines (section 1.7.6) for detailed troubleshooting steps.
KX 155 and KX 165 Specifications Comparison
While sharing a similar design, the KX 155 and KX 165 exhibit key differences. Both are VHF NAV/COMM transceivers, but the KX 165 generally offers enhanced features and performance. Both units support 500 Ω headphone impedance and utilize low impedance carbon or dynamic microphones with transistorized pre-amps.
The primary distinction lies in the KX 165’s expanded memory capacity for storing navigation frequencies and waypoint data. Additionally, the KX 165 often includes improved stability and sensitivity. Both models require careful antenna selection – broadband 50 Ω vertical or horizontal options are suitable. Refer to the detailed specifications documentation (available as a PDF brochure) for a comprehensive comparison of all parameters and capabilities.
Operating Life Extension
Maximizing the operational lifespan of your KX 155 requires adherence to specific power-up and power-down procedures. As with all sensitive avionics, it’s crucial to activate the KX 155 only after engine start-up, ensuring a stable power supply. Conversely, always deactivate the unit prior to engine shutdown.
These precautions safeguard the solid-state circuitry from voltage fluctuations and potential damage. Proper installation, utilizing correct antenna connections (broadband 50 Ω types) and appropriate headphone/microphone impedance (500 Ω headphones), also contributes significantly. Regular inspections and adherence to maintenance schedules, detailed in the installation manual, will further extend the reliable service life of your KX 155 transceiver.
Avionics Power-Up and Power-Down Procedures
Following correct power sequencing is paramount for extending the operational life of the KX 155. The recommended procedure dictates that the unit should only be powered on after the engine has successfully started and is providing a stable electrical source. This prevents potential damage to the sensitive solid-state components from voltage spikes during engine cranking.
Similarly, prior to engine shutdown, the KX 155 should be switched off. This minimizes stress on the circuitry during the voltage drop associated with engine stopping. Consistent adherence to these simple steps, outlined in the installation manual, will significantly contribute to the longevity and reliable performance of your avionics equipment, ensuring years of dependable service.
Accessing Installation Manuals (ATP Grid Index)
Aircraft Technical Publishers (ATP) provides a comprehensive grid index for locating Bendix/King KX 155 and KX 165 maintenance and installation manuals. This valuable resource, accessible through ATP’s catalog, streamlines the process of finding the correct documentation for servicing these VHF NAV/COMM transceivers.
ATP’s index specifically references manuals covering both maintenance and installation procedures. Contacting ATP’s customer service (800-227-4610, 6AM-5PM PST M-F) can further assist in locating the precise manual needed. Utilizing the ATP Grid Index ensures technicians have access to official, up-to-date documentation, facilitating accurate and compliant repairs and installations.
Manual Release Restrictions (Honeywell Employee Use Only)
Please be advised that the KX 155/165 Installation Manual is released for the exclusive use of Honeywell employees within the Americas region. Unauthorized distribution or access outside of designated personnel is strictly prohibited. The document contains proprietary information critical to the proper installation and maintenance of these avionics systems.
Access to this manual is governed by internal Honeywell policies and procedures. Any reproduction, modification, or dissemination of this material requires explicit authorization. The manual includes a reference number for tracking and accountability purposes, ensuring compliance with security protocols. Strict adherence to these restrictions is essential for protecting Honeywell’s intellectual property.
Parameter Settings (SINAMICS G120 Reference ― Manual Control)
This comparison highlights the importance of understanding fundamental control mechanisms. Just as the G120 requires specific parameter adjustments to enable manual operation, the KX 155 installation necessitates careful configuration and verification of settings. Pressing the “Manual” button on the G120 opens a submenu – similarly, the KX 155 requires deliberate step-by-step procedures for optimal functionality.
Detailed Feature Explanations
The KX 155 boasts a robust feature set, demanding a thorough understanding for successful installation and operation. Key functionalities include VOR, LOC (Localizer), and Glideslope indicators, crucial for precise navigation. The unit supports both 50 Ω vertically and horizontally polarized antennas, requiring correct coaxial cable connections for optimal signal reception.
Furthermore, compatibility with headphones (500 Ω nominal impedance) and microphones (low impedance carbon or dynamic with pre-amp) is essential. The KX 155A variant introduces specific installation considerations, detailed in supplemental documentation. Proper Bendix/King serial code integration is vital for full system functionality. Understanding these features ensures a correctly installed and fully operational avionics system.
Step-by-Step Installation Guide
Begin by carefully unpacking and inspecting the KX 155, verifying all components are present. Next, determine the optimal installation location, considering panel cutout dimensions and secure mounting points. Accurate wiring is paramount; consult the detailed wiring diagram for correct connections. Ensure proper antenna installation – either broadband 50 Ω vertical or horizontal – utilizing appropriate coaxial cabling.
Connect headphones and microphones, confirming impedance compatibility. Before powering up, double-check all connections. Initiate the system with the engine running, following avionics power-up procedures. Perform initial system testing, verifying VOR, LOC, and Glideslope indicator functionality. Refer to section 1.7.6 for TSOd systems considerations.
Further Resources and Support
For comprehensive technical documentation, consult Aircraft Technical Publishers (ATP), specifically their Bendix/King KX 155/165 maintenance and installation manuals, accessible via their ATP Grid Index. Honeywell employees can access restricted manuals internally. Detailed specifications for both the KX 155 and KX 165 are available in brochure PDFs, offering a direct comparison of features.
Should installation issues arise, refer to the troubleshooting section within this manual. Remember to prioritize avionics power-up and power-down procedures to maximize operating life. For parameter settings related to manual control, the SINAMICS G120 reference manual provides valuable insights. Contact Bendix/King or authorized service centers for further assistance and support.
