MODUK - DEF STAN 59-411: PART 4
Electromagnetic Compatibility Part: 04 : Platform and System Tests and Trials
|Publication Date:||14 June 2019|
Clause 3 of this Standard deals with general requirements for IUT test and trials.
Annex A of this Standard deals with Air Service requirements including Air System Trials for Release to Service (RTS). The approval for release into service of aircraft is stringently controlled. MOD Project Office is responsible for issuing the Military Aircraft (MA) Release documentation. Alternatively, if the project is following the MOD Generic Aircraft Release to Service (RTS) process contained in Military Aviation Authority (MAA) Regulatory Publication (MRP) RA 1300 Release to Service, then the aircraft RTS Authority is responsible for issuing the aircraft's RTS documentation. Before the release to Service can be issued a number of engineering assessments and trials in accordance with Defence Standard 00-970 have to be completed. These include theoretical studies and EMC trials of individual equipment's, sub-systems and the complete aircraft in its various configurations as described in this standard. Whilst any authority may conduct these assessments and trials, both ground and flight, it is usual practice to involve the experience of experts in the field who have the facilities for total aircraft and flight trials.
EMC testing of the complete aircraft will normally involve a number of differing techniques including low level swept current (LLSC), bulk current injection (BCI), and mode stirring as well as full threat radiation. The extent of testing necessary depends on aircraft type, its role, and the technologies employed for its manufacture. Advice should be sought from E3A and experts in the field.
Reference should be made to Annex B Land Service below for the relevant requirements agreed with the MOD Project Officer for ground-based Air Service systems.
NOTE For aerospace ground equipment (AGE), refer to Part 1, support equipment requirements.
Annex B of this Standard deals with Land Service requirements. Land IUT may comprise military vehicles, transportable containerised facilities or fixed facilities (buildings). Also included are man worn/man portable platform (tri-service) for which the land service requirements of Annex B apply. This Annex describes the requirements for EMC in-situ testing of IUTs in terms of emission and susceptibility testing, RF earth bonding of the IUT, radiation patterns of omni-directional antenna(s) mounted on the vehicle or container body (covering some but not all the requirements of antennas used for ground-to-air communications), limitation of the degradation of communications quality due to on-board sources of interference (applicable therefore, both to IUT which only communicate when stationary as well as to those which may also be designed to communicate on the move) and mutual interference trials. This Annex is applicable to fixed, transportable and mobile installations and communication systems (dependent on the frequency range of co-located transmitters and receivers using omni-directional antennas) and supporting point-to-point communication links over propagation paths which may be obstructed. This Annex is applicable up to the "Installation Certificate of Design and Performance" stage of procurement. Parts of the Standard may also be appropriate to production and in-service testing.
Annex C of this Standard deals with Sea Service requirements. Whole platform EMC trials should be undertaken for new construction vessels and following major upkeep periods to provide assurance that total system electromagnetic compatibility has been achieved. The Prime Contractor or Ship Repairer should provide a test plan that identifies which trials are to be undertaken to demonstrate compliance with the EMC requirements of the vessel. This Annex describes the requirements for EMC in-situ testing of large or complex IUTs in terms of emission and susceptibility testing, EMC Part I and Part II trials of submarine platforms, Weapon Electronic Mutual Interference Trials (WEMIT) for ships and submarines and considerations for land-based Sea systems. This Annex is applicable to large Sea systems, ship and submarine platforms and land-based Sea systems.
The detailed application of this Standard to a specific project shall be agreed with the MOD Project Manager. If the MOD Project Manager is to determine the detailed application then it should be included in the procurement specification to be correctly costed by the tenderers.
The scope of this Part 4 is EMC. It also mentions Radiation Hazards (RADHAZ), Electrostatic Discharge (ESD), Nuclear Electromagnetic Pulse (NEMP), armaments and Electro-Explosive Devices (EED's), only when it is pertinent to a specific service. This document does not deal with these topics specially, and further standards should be referred to if these areas are of concern.