The PTS for lighter-than-air aircraft are the FAA-S-8081- 17 (Private Pilot) and FAA-S-8081-18 (Commercial Pilot).  Copies may be obtained by: in 14 CFR part 91 set forth the concept of “See and Avoid.”  This concept requires that vigilance shall be maintained at all  times, by each person operating an aircraft. Pilots should also  keep in mind their responsibility for continuously maintaining  a vigilant lookout regardless of the type of balloon being flown  and the purpose of the flight. Most midair collision accidents  and reported near midair collision incidents occur in good  VFR weather conditions and during the hours of daylight.  The official online bookstore web site for the United States  Government Printing Office is http://bookstore.gpo.gov.  With regards to balloon operations, the argument can be  made that any discussion of collision avoidance applies when  dealing with operations close to the ground. When contour  flying, or during an approach to a landing site, the potential  of collision with trees, power lines, and other obstacles is  increased.  [Figure 1-4] The techniques used in collision  avoidance can be extremely valuable, particularly in the  evolution of a balloon flight, as the pilot is perhaps exposed  more to the dangers of collision than any other aircraft.  The “See and Avoid” concept relies on knowledge of the  limitations of the human eye, and the use of proper visual  scanning techniques to help compensate for these limitations.  The importance of, and the proper techniques for, visual  scanning should be taught to a student pilot at the very  beginning of flight training. The competent flight instructor  should be familiar with the visual scanning and collision  In the interest of safety and the development of good flight  habits, the flight instructor and student pilot should follow  certain basic flight safety practices and procedures in every  flight operation. These include, but are not limited to,  collision avoidance procedures including proper scanning  techniques, use of checklists, runway incursion avoidance  and other airspace operations, positive transfer of controls,  and workload management.  All pilots must be alert to the potential for midair collision and  near midair collisions. The general operating and flight rules  • Downloading from the Regulatory Support Division,  AFS-600, website at http://afs600.faa.gov.  •  Purchasing printed copies from the Superintendent  of Documents, U.S. Government Printing Office,  Washington, DC 20402.  Flight Safety Practices  Collision Avoidance  1-5 Figure 1-3.  Practical Test Standards.