Context: Hazards to aircraft include debris, nesting birds, and reduced friction levels due to environmental conditions such as ice, snow, or rain. Part of runway maintenance is airfield rubber removal which helps maintain friction levels. The fields must be kept clear of debris using cleaning equipment so that loose material does not become a projectile and enter an engine duct (see foreign object damage). In adverse weather conditions, ice and snow clearing equipment can be used to improve traction on the landing strip. For waiting aircraft, equipment is used to spray special deicing fluids on the wings.

Question: What includes debris and nesting birds?
Answer: Hazards to aircraft

Question: What is one part of runway maintenance that helps maintain friction levels?
Answer: airfield rubber removal

Question: In adverse weather conditions, what can be used to improve traction on the landing strip?
Answer: ice and snow clearing equipment

Question: What is one hazard to nesting birds?
Answer: Unanswerable

Question: What helps maintain environmental conditions?
Answer: Unanswerable

Question: Why must the field be kept clear of nesting birds?
Answer: Unanswerable

Question: What helps improve traction on airfield rubber?
Answer: Unanswerable

Question: For what kind of aircraft is deicing fluid sprayed on the airfield?
Answer: Unanswerable