 Planning guidance on aircraft noise advises that " in some circumstances the public perceive general aircraft noise levels as more disturbing than similar levels around major airports . " This is a result of the tonal characteristics of light aircraft engines and the activities they are engaged in , including : repetitive circuit flying at low @-@ altitude near an aerodrome , during which aircraft are audible for long periods ; slow climbing aircraft engaged in parachute drop or glider tug activities concentrated around the drop zone or aerodrome , also audible for long periods ; erratic and repetitive engine noise from aircraft engaged in aerobatics ; and piston @-@ engines on full power in areas of low background noise , leading to the perception that such noise is more intrusive . In an attempt to alleviate these problems , the majority of aerodromes implement noise abatement procedures designed to route aircraft away from noise sensitive areas , and more than 50 are required by the government to provide consultative facilities in which local concerns can be raised with aerodrome operators . 
 Planning guidance on aircraft noise <a href='uninflect' title='1'><mark>advises</mark></a> that " in some circumstances the public perceive general aircraft noise levels as more disturbing than similar levels around major airports . " This is a result of the tonal characteristics of light aircraft engines and the activities they are engaged in , including : repetitive circuit flying at low @-@ altitude near an aerodrome , during which aircraft <a href='drop_aux' title='2'><mark>are</mark></a>audible for long periods ; slow climbing aircraft engaged in parachute drop or glider tug activities concentrated around the drop zone or aerodrome , also audible for long periods ; erratic and repetitive engine noise from aircraft engaged in aerobatics ; and piston @-@ engines on full power in areas of low background noise , leading to the perception that such noise <a href='drop_aux' title='3'><mark>is</mark></a>more intrusive . In an attempt to alleviate these problems , the majority of aerodromes implement noise abatement procedures designed to route aircraft away from noise sensitive areas , and more than 50 are required by the government to provide consultative facilities in which local concerns can be raised with aerodrome operators . 
Plannin guidance on aircraft noise advise that " in some circumstances the public perceive general aircraft noise levels as more disturbing den similar levels around major airports . " This is a result of da tonal characteristics of light aircraft engines and the activities they are engaged in , including : repetitive circuit flying at low @-@ altitude near an aerodrome , durin which aircraft audible for long periods ; slow climbin aircraft engaged in parachute drop or glider tug activities concentrated around the drop zone or aerodrome , also audible for long periods ; erratic and repetitive engine noise from aircraft engaged in aerobatics ; and piston @-@ engines on full power in areas of low background noise , leading to tdaperception that such noise more intrusive . In an attempt to alleviate dese problems , the majority of aerodromes implement noise abatement procedures designed to route aircraft away from noise sensitive areas , and more tden50 are required by the government to provide consultative facilities in which local concerns can be raised w aerodrome operators .