Exercise 4. Paraphrase the following sentences

1. Prior to the European air travel disruption of April 2010, aircraft engine manufacturers had not defined specific particle levels above which engines were considered to be at risk.

2. In order to minimise the level of further disruption that this and other volcanic eruptions could cause, the CAA announced the creation of a new category of restricted airspace called a Time Limited Zone.

3. Airspace categorised as TLZ is similar to airspace experiencing severe weather conditions in that the restrictions are expected to be of a short duration; however, the key difference with TLZ airspace is that airlines must produce certificates of compliance in order for their aircraft to enter these areas.

4. Volcanic ash in the immediate vicinity of the eruption plume is of an entirely different particle size range and density to that found in downwind dispersal clouds which contain only the finest grade of ash.

5. This is therefore a serious safety hazard which invites preventive risk management strategies in line with other comparable aviation risks.

Exercise 5. Make up your own sentences using the following terms:

volcanic ash, turbocompressor blades, air travel disruption, safe upper limit of ash density, time limited zone, no fly zone, downwind dispersal clouds.

Text 3.

Read and translate the following text.