III Skim the text and finish the sentences with a partner.
1 Navigation is the process………………………………………………. ……... 2The ADF is a form of ‘radio compass’ ………………………………………… 3 The ADF works by using the electromagnetic properties……………………… 4 Distance measuring equipment (DME) is ……………………………………… 5 It measures distance by timing the propagation delay of …………………….... 6 It was invented by ……………………………………………………………… 7 DME is similar to……………………………………………………………….. 8 DME is functionally identical to……………………………………………….. 9 Aircraft use DME to determine their distance from ……………………………10 The ground stations are typically …………………………………………….. 11 A typical DME ground transponder system for en-route or terminal navigation 12 A low-power DME can also be co-located with an ILS glide slope or localizer……………………………………………………………………………. IVSplit up into small groups.Scan the text to match the clauses together to make sentences. A 1TCAS involves communication between 2 The TCAS system builds a three dimensional map of aircraft in the airspace, 3 TCAS and its variants are only able to interact 4 A unique 24-bit identifier is assigned to 5 The FMS is a fundamental part of 6 It automates a wide variety of in-flight tasks 7 A primary function is 8 The modern FMS was introduced 9 No one modern aircraft cannot make flights without 10 FMS calculates and unites all B a parameters during flight and provide safety trajectory. b uniform system such like FMS. c on the Boeing 767. d in-flight management of the flight plan. e reduces the workload on the flight crew to the point that modern aircraft no longer carry flight engineers or navigators. f a modern airliner's avionics. g each aircraft that has a mode S transponder. h with aircraft that have a correctly operating mode C or mode S transponder. i incorporating their range, altitude, and bearing. j all aircraft equipped with an appropriate transponder. V Do you remember how are the following words used in the text? Make sentences in the groups. 1 ADF 2DME 3 IFF 4 TACAN 5 VORs 6 UHF channel 7TCAS 8 FMS 9 CDU
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