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Aviation History
1993
1993 - 2038.PDF
AIRLINER AVIONICS CMC's CMA-771 is certified on the MD-80 the TNL-8100, a nine-channel GPS navi gation system with DGPS capability. industry standard in inertial-reference sys tems (IRS), superseding mechanical gyros. The virtual elimination of moving parts brought with it an increase in reliability and manufacturers are now introducing smaller second-generation RLGs, resulting in more-compact IRSs. Litton Aero Products' LTN-90 series of inertial systems uses three 280mm path- length RLGs in a lOMCU-size unit. This "first-generation" family includes the LTN-92, a laser-gyro replacement for Lit- ton's popular LTN-72 mechanical-gyro inertial-navigation system. The company has now introduced the second-generation LTN-101 Flagship, which has two smaller laser gyros in a 4MCU system. Each RLG combines two laser gyros in a single cavity. The Flagship is available as an ADIRS, with Sextant Avionique air-data modules, or as a GP/ ADIRS with an integrated LTN-2001 global-positioning system (GPS) receiver. Honeywell's first generation of 10MCU- size laser-inertial systems is being super seded by a 4MCU family, which is 60% smaller, 40% lighter and requires 50% less power. The new HG 2001 is available as an IRS, ADIRS or GP/ADIRS, integrated with CMC's GPS receiver. Delco Electronics developed the hemi spherical resonator gyro as an alternative to the RLG. Now the gyro, which resem bles a resonating wineglass, with no mov ing parts and virtually indefinite life, is used in a replacement for Delco's widely used Carousel IV mechanical-gyro INS. GLOBAL POSITIONING Supplemental use of the US global- positioning system for en route navigation and non-precision approach is now al lowed. Further development is expected to result in use of wide-area differential GPS (DGPS) for Category I precision approaches and local-area DGPS for Cat II/III landings. Canadian Marconi developed the 12- channel CMA-3012 GPS receiver mar keted by Honeywell and selected by Boeing for initial certification on the 777. CMC had earlier developed a two-channel GPS receiver for its Omega navigation systems and its CMA-771 Omega/GPS is now certificated on the MD-80, with its CMA-900 navigation management system to follow. Litton Aero Products developed its LTN-211 Omega system into the LTN-311 with GPS capability and has now intro duced the LTN-2001, a stand-alone eight- channel GPS which can be integrated with the company's LTN-90-series and LTN- 101 Flagship inertial systems. Trimble Navigation developed a six- channel GPS capability for its TNL-7880/ 7900 Omega systems and introduced a GPS navigation system, the TNL-8000. The company has now followed this with DATA MANAGEMENT INFORMATION ACQUISITION Making use of the vast amounts of data available from aircraft systems is a major airline concern and data management is a fast-growing market encompassing equip ment ranging from FDRs to the ELS. Aircraft are required to carry CVRs and FDRs (produced by the likes of Lockheed, Loral Data Systems, Sundstrand and Uni versal Navigation) for post-accident analysis. FDRs are slow-access devices and many airlines choose also to install also quick-access recorders (QARs), to collect flight data for operational analysis. QAR manufacturers Penny & Giles and Teledyne Controls are now offering opti cal devices in which the cassette-tape memory is replaced with higher-capacity, quicker-access optical-disk storage. Mem ory is expanded by a factor • of at least three, and lOh of data can be searched in just lOmin. Teledyne's optical QAR is now certificated on the 747-400 and 767-300: approval on other variants of the 747 and the 757 is to follow. Dassault Electronique has received a launch order from Air Inter for an ex- panded-memory QAR for use in A321s and A330s, with deliveries beginning in mid-1993. Both the FDR and QAR are fed informa tion by flight-data acquisition units (man ufacturers include GEC-Plessey Avionics, Hamilton Standard, Sextant, Sundstrand and Teledyne). The greatly expanded data available from an aircraft condition- monitoring system can also stored by a FLIGHT INTERNATIONAL 18 - 24 August 1993 37
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