LGA-5005 HLD and Enhanced Low Gain Antenna (HELGA) Installation manual
LGA-5005 (HELGA) Installation manual Document number: 98-152675-A Release date: 15 December 2020 Cobham Public
Disclaimer Information in this document is subject to change without notice. The information, drawings and wiring diagrams contained in this manual are intended as a reference for engineering planning only. The drawings and wiring diagrams contained herein do not represent any specific Supplemental Type Certificate (STC). It is the installer's responsibility to produce installation drawings specific to the aircraft.
Disposal Old electrical and electronic equipment marked with this symbol can contain substances hazardous to human beings and the environment. Never dispose these items together with unsorted municipal waste (household waste). In order to protect the environment and ensure the correct recycling of old equipment as well as the re-utilization of individual components, use either public collection or private collection by the local distributor of old electrical and electronic equipment marked with this symbol.
Safety summary The following general safety precautions must be observed during all phases of operation, service and repair of this equipment. Failure to comply with these precautions or with specific warnings in this manual may violate the safety standards of design, manufacture and intended use of the equipment.
Table of Contents Chapter 1 Chapter 2 Chapter 3 About This Manual 1.1 Purpose .....................................................................................................................................1-1 1.2 Manual overview ...............................................................................................................1-1 1.3 Precautions ............................................................................................................................
Table of Contents A.2 DO-160 specifications ...................................................................................................A-2 A.2.1 Qualification Forms ............................................................................................................A-2 A.3 Certification ..........................................................................................................................A-5 A.3.1 Certifying agency ..........................................................
List of figures Figure 2-1: Figure 2-2: Figure 3-1: Figure 3-2: Figure 3-3: Figure 3-4: Figure 3-5: Figure 3-6: Figure 6-1: LGA-5005.............................................................................................................................................................. 2-1 AVIATOR 200 S with LGA-5005 ................................................................................................................ 2-3 Mounting hole sealing kit .............................................
List of tables Table 2-1: Table 2-2: Table 2-3: Table 4-1: Table 5-1: Table 5-2: Table 6-1: Table A-1: Table A-2: Table A-3: Equipment covered .......................................................................................................................................... 2-1 Summary of system equipment................................................................................................................. 2-2 Coaxial cable characteristics...................................................
1111 Chapter 1 About This Manual 1.1 1 Purpose This installation manual provides the general instruction for the installation of the LGA5005 on aircraft. Important The information, drawings and wiring diagrams contained in this manual are intended as a reference for engineering planning only. The drawings and wiring diagrams contained herein do not represent any specific certified installation design. It is the installer's responsibility to produce installation drawings specific to the aircraft.
Precautions 1.3 Precautions Warnings, Cautions and Notes Text marked with “Warning”, “Caution”, “Note” or “Important” show the following type of data: • Warning: A Warning is an operation or maintenance procedure that, if not obeyed, can cause injury or death, or jeopardize the flight safety on the aircraft. • Caution: A Caution is an operation or maintenance procedure that, if not obeyed, can cause damage to the equipment. • Note: A Note gives information to help the reader.
2222 Chapter 2 Introduction 2.1 2 Scope This installation manual provides the general installation instructions and mounting considerations for the LGA-5005, part number: 405005. The Design Assurance Level of the LGA-5005 for software and hardware is DAL D. The installer must derive specific installation details for each different aircraft type, using this manual as a guideline, while adhering to standard aircraft practices, refer to [1], or its equivalent.
System overview 2.2 System overview The purpose of the LGA-5005 is to provide an L-band radio link between the Inmarsat SwiftBroadband Class 4 SATCOM system AVIATOR 200S and an Inmarsat I4 satellite. For SwiftBroadband services, the LGA-5005 is part of a single channel aeronautical SATCOM system comprising the following subsystems (as defined in ARINC 781-6, Attachment 7, Configuration 3 [4]), interconnected as shown in Figure 2-2:.
2222 Interface of the LGA-5005 The following block diagram shows the AVIATOR 200S system with LGA-5005: Figure 2-2: AVIATOR 200 S with LGA-5005 The LGA-5005 is intended to comply with DO-262B, Appendix E, as part of an AES4 system. LGA-5005 may only be installed with an AVIATOR-S CSDU [SDU-5045, part number 405045-vvccc] and SCM [SCM-5055, part number 405055-vvccc]. Together, these three items form a complete AES4 system, as defined in DO-262B, Appendix E.
Interface of the LGA-5005 the antenna or separately. The cable must meet the requirements set out in the following table. Characteristic Value Interface impedance 50 Ohm. Maximum allowed RF cable loss between CSDU and LGA-5005 18 dB at 1.6 GHz. Maximum allowed cable DC resistance 0.6 Ohm. Table 2-3: Coaxial cable characteristics The definition of the electrical signals carried on the cable interface between LGA-5005 and the CSDU is specific to the Cobham AVIATOR-S system.
3333 Chapter 3 Installation 3.1 3 General information and overview This chapter contains considerations and recommendations for installation of the LGA5005. Wiring and physical mounting must satisfy all applicable regulations.
Unpacking & initial inspection 3.3 Unpacking & initial inspection Inspect the shipping container immediately upon receipt for evidence of damage during transport. If the shipping container is severely damaged or water stained, request that the carrier's agent be present when opening the carton.
3333 Prerequisites 3.4 Prerequisites Before you start to install the antenna, read the following sections carefully: • Antenna location and mounting considerations • Structural modifications and sealing • Grounding • Alignment and installation limitations Refer to [2] for an outline drawing of the LGA-5005. 3.4.1 Antenna location and mounting considerations This section provides information on the mounting of the LGA-5005 hardware and the installation of the antenna.
Prerequisites connector/skin penetration area. The gasket may have to be reduced in size to achieve this and it will be different for different radii of aircraft fuselages. If an injectable sealant is considered: 1.
3333 Prerequisites 3.4.3 Grounding It is the responsibility of the installer to ensure that the grounding between the LGA-5005 and the fuselage is in accordance with the airframe manufacturer’s requirements. The primary method of grounding the LGA-5005 is through the mounting bolts. Grounding may also be achieved through the mounting feet which are not painted, but chemically converted to allow for grounding to unpainted surfaces (see Figure 3-2).
Prerequisites antenna offset angles be measured to an accuracy of 0.5° and programmed into the CSDU, refer to [6]. You can determine the roll and pitch offset of the antenna by subtracting the aircraft attitude angles from the antenna attitude angles (relative to the same local level). The aircraft attitude angles may be read from the aircraft avionics or measured with an electronic level on an appropriate reference surface.
3333 Prerequisites In particular, an Iridium system should not be used for safety services (e.g. ACARS, FANS) while an Inmarsat transmitter is able to transmit. If a dual dissimilar SATCOM installation (Inmarsat + Iridium) is required for redundancy of safety services, the two systems should operate on a mutually exclusive basis. This may be achieved by a manual switch-over arrangement between the systems, or by an automatic cooperative arrangement, such as described in ARINC 781-7, Section 3.1.4.3.
Installation of the antenna 3.5 Installation of the antenna The following is supplied with the antenna: • LGA-5005 Mounting Hole Sealing Kit (refer to [4]). The LGA-5005 can be mounted directly to the aircraft fuselage or to a mounting plate [10] which has been attached to the fuselage as described in document [11]. CAUTION! Do not step or walk on the mounting plate. The procedure below covers both cases. 1. If applicable, refer to section 3.4.
3333 Installation of the antenna CAUTION! It is the responsibility of the Installer to ensure that the correct length and type of bolt is used. 8. If verification of the bonding resistance between the antenna and the fuselage is required, perform the measurement from the inside of the fuselage, between the body of the TNC connector and a suitable point on the inside of the fuselage. 9.
Removal of the antenna 3.5.1 Installation verification Make sure that the antenna is fixed to the fuselage or mounting plate by means of 4 bolts, which are externally accessed. Refer to the Installation Manual of the satellite terminal for system verification tests [6]. 3.6 Removal of the antenna To remove the LGA-5005 where it has been installed either directly to the aircraft fuselage or to a mounting plate follow the procedure below: 1.
4444 Chapter 4 Maintenance 4 This chapter has the following sections: • General maintenance and repair • Events generated by the LGA-5005 • Returning units for repair 4.1 General maintenance and repair The LGA-5005 does not require maintenance or adjustment apart from routine checking of its installation.
Events generated by the LGA-5005 subjected to hail or lightning strikes (refer to the ACMM [3]). Refer to Table 4-1, below, for information on inspection actions applicable to the LGA-5005. Inspection tasks Inspection Action Check that the antenna is securely fastened Re-tighten the screws. to the fuselage. Check the radome for cracks, paying particular attention to the area around the fixing points and to the front. Return the unit to Cobham SATCOM.
4444 Returning units for repair 4.3 Returning units for repair 4.3.1 Return Material Authorization (RMA) Should your Cobham SATCOM product fail, use the online partner portal www.cobham.com/satcom, Cobham SYNC Partner Portal. There you will get guidance for the RMA process. 1. To request login credentials submit an email to: AVIATOR.support@cobham.com. 2. Fill in the RMA details at the Cobham SYNC Partner Portal.
Returning units for repair RMA procedure Before returning units for repair, please follow this procedure: 1. Have the following information ready before calling the Customer Service Center: • Model number (example: LGA-5005). • Serial number (example: 00443322). • A thorough description of the fault. • Aircraft serial number and/or tail number. 2. Contact a Cobham Service Center, see Technical support on page 4-1. 3. Describe the fault as thoroughly as possible and ask for assistance.
5555 Chapter 5 Special tools, fixtures and equipment 5 For tools, fixtures and equipment necessary to perform the LGA-5005 installation procedures described in this manual refer to Table 5-1, below. There are no Cobham part numbers. Equivalent substitutes may be used. Note Name Specification or part number Source /CAGE code 1 Torque spanner TNC, 15 mm (0.591"), 0.46 to 0.69 Nm (0.34 to 0.51 ft-lb) 2 Torque driver 3 3.95 to 6 Nm (2.9 – 4.
6666 Chapter 6 Illustrated parts list 6 Figure 6-1: LGA-5005 – HELGA 98-152675-A Cobham Public 6-1
Figure Item Part Number Nomenclature Quantity per Assy Notes 1 405005-vvccca HLD and Enhanced low Gain Antenna (HELGA) 1 2 780-A0785 Sealing cap with O-ring and air displacer 4 2 spares included 4 NAS623-3-xx or NAS1101-3-xx Mounting bolts 4 To be supplied by the installer. Length to be determined by installer 5 Commercially available Anti-static cap 1 Table 6-1: Legend for figure items a.
AAAA Appendix A Equipment specifications Important A The information, drawings, and wiring information contained in this manual are intended as a reference for engineering planning only. It is the installer’s responsibility to compose installation drawings specific to the aircraft. This appendix has the following sections: • LGA-5005 specifications • DO-160 specifications • Certification A.
DO-160 specifications A.2 DO-160 specifications A.2.1 Qualification Forms The Environmental Qualification Forms list the environmental categories under which the LGA-5005 has been approved. Qualification Details Environmental Refer to RTCA DO-160G for further details on the following Environmental Qualification Forms. Table A-2: Qualification Forms Part Number: LGA-5005 Conditions DO-160G Cat.
AAAA DO-160 specifications Conditions DO-160G Cat. Comments Operational shocks and crash safety 7.0, 7.3.3 E Low-frequency operational shock and low frequency crash: Shock Low-frequency operational 6g/20ms and Crash safety 20g/20ms. Vibration 8.
DO-160 specifications Conditions DO-160G Cat. Comments Audio Frequency Conducted Susceptibility - power inputs 18.0 X No power from aircraft. Induced Signal Susceptibility 19.0 CW Interference free operation is required, wide frequency range AC primary power. Radio frequency susceptibility 20.0 WR Bench Testing. RF Port.- Anechoic Chamber Method. For Conducted Susceptibility Cat W For Radiated Susceptibility Cat RY Emission of radio frequency energy 21.
AAAA Certification A.3 Certification A.3.1 Certifying agency Acceptance for the installation and use of the LGA-5005 and its associated components must be obtained through the appropriate offices of the FAA or other certifying agency. It is recommended that all proposed installations be coordinated with the local jurisdiction of the FAA or other certifying agency prior to performing the installation. A.3.
BBBB Appendix B References B.1 B References [1] AC 43.131B/2B; Acceptable Methods, Techniques, and Practices - Aircraft Inspection, Repair and Alterations, U.S.
3333 Glossary Glossary 3 A AES Aircraft Earth Station APU Auxiliary Power Unit. ARINC Aeronautical Radio Incorporated. ATA Air Transport Association C CSDU Compact Satellite Data Unit. D DC Direct Current. F FAA Federal Aviation Administration. FLS Field-loadable Software G GB Grounding and Bonding GHz Giga Hertz. GLONASS GLObal’naya NAvigatsionnaya Sputnikovaya Sistema. Global Navigation Satellite System GPS Global Positioning System.
Glossary P PNR Part Number R RF Radio Frequency. RH Relative Humidity. RMA Return Material Authorization. RTCA Radio Technical Commission for Aeronautics Rx Received signal. S SCM SDU Configuration Module SDU Satellite Data Unit STC Supplemental Type Certificate. FAA certification document issued to companies that perform significant modifications on an aircraft. T TNC Threaded Neill-Concelman. A type of RF connector used for terminating coaxial cables. Tx Transmitted signal.
4444 Index Index A address manufacturer, -ii aerodynamics load, bolts, 3-10 alignment, 3-5 antenna base radius, 3-3 APU inlet, 3-7 B block diagram, system, 2-3 blockage, 3-6 bolts, 3-10 aerodynamic loads, 3-10 breathing holes location, 3-5 C cable DC resistance, 2-4 cable loss, 2-4 checking the antenna, 4-2 connector protective cap, 3-2 contact address, -ii D Design Assurance Level, 3-1 hardware, A-1 software, A-1 DO-160 forms, A-2 E Environmental Qualification Forms, A-2 F fixtures, 5-1, 6-1 fuselage
Index shipping address, 4-4 software part number, 3-1 specifications, A-1 Standards, applicable, B-1 STC, 3-1 storage, 3-1 structural loads, 3-3 support contact details, 4-1 contact information, 4-1 T technical support, 4-1 tools, 5-1, 6-1 torque mounting bolts, 3-8 TNC connector, 3-8 transportation, 3-1 Index-2 Cobham Public 98-152675-A
98-152675-A www.cobham.
