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Table 5 <br />T. rends in Percentage of Single Engine Aircrafts Equipped with Avionics <br /> <br />VHF <br />VOR <br />DME <br />ADF <br />ILS <br />TRANS <br />AP <br /> <br />1972 1974 1981 1984 <br />72.8 74.4 86.8 91 <br />67.6 73.4 83.4 86 <br />4.9 6.4 20.8 34 <br />25.8 28.3 45.7 60 <br />7.5 10.8 29.4 46 <br />13.0 25.2 55.2 - <br />9.8 1~.7 23.6 33 <br /> <br />Source: Mn/DOT Aircraft Owners Survey <br /> <br />3.2 Cost of Operatin5 and Maintainin~ <br /> <br />The FAA reports that the operating and maintenance costs have been rising <br />faster than the rate of inflation. For the period 1970-1984, maintenance <br />costs increased at a yearly rate of 7.3% while operating costs increased at <br />a rate of 12% (1). Figure 1 shows the trends in operating and maintenance <br />costs for different aircraft types. <br /> <br />45O <br /> <br />4O0 <br /> <br />35O <br /> <br />3OO <br /> <br />250 <br /> <br />200 <br /> <br />150 <br /> <br /> Figure 1 <br />Trends in-Operating and Maintenance Costs <br /> <br />76 77 78 79 80 81 82 83 84 <br /> <br />oper. <br /> <br />maint. <br /> <br />6 <br /> <br /> <br />