text: Chapter 3
  SITUATION 2, AIRCRAFT REPORTING FROM A CARDINAL DIRECTION AND DISTANCE
  3-64. Often, units conduct mutually-supporting helicopter operations to increase the security of an LZ
  operation. For example, a team of observation and attack helicopters might screen the LZ
  3-65. Because no aircraft plan to land there, and because the utility or lift aircraft know the LZ and
  screen team's location from communications over internal UHF or VHF radio nets, the screening
  helicopters need not contact the pathfinder. However, if they learn an aircraft does need to land at the LZ,
  the screening helicopter team responds differently to initial contact.
  3-66. Due to a possible conflict with aircraft departing the landing site in the same direction, the
  pathfinder must track the inbound aircraft's course and advise mission aircraft of the unexpected arrival. To
  accurately track the aircraft and control the situation, the pathfinder uses a commonly known point in the
  direction of the aircraft. He can use a prominent terrain feature, a checkpoint, or an aerial control point
  previously established by the ground unit for maneuver control. This situation matches Situation 1 exactly,
  except that the controller does not give the aircraft's heading and distance.
  SITUATION 3, AIRCRAFT WITH IN-FLIGHT EMERGENCY
  3-67. An in-flight emergency occurs when an aircraft develops a mechanical problem that challenges
  the pilot's ability to maintain control. Because the pilot must focus on the problem with the aircraft, the
  pathfinder helps by moving other air traffic away from the one having the problem, which has first priority.
  If the emergency develops before initial contact, OPSEC requires a full information exchange, just like in a
  standard transmission. After the pilot declares the emergency, the situation continues as follows:
  Pilot: ALPHA ONE LIMA ONE SIX (A1L16), THIS IS CHARLIE ZERO
  WHISKEY ZERO TWO (C0W02), IN-FLIGHT EMERGENCY
  (MAYDAY), OVER.
  Pathfinder: THIS IS LIMA ONE SIX, WIND ZERO THREE FIVE AT SIX, CLEAR TO
  LAND, STATE INBOUND HEADING, OVER.
  Pilot: THIS IS WHISKEY ZERO TWO, HEADING TWO SIX ZERO, OVER.
  Pathfinder: ALL STATIONS, THIS IS ALPHA ONE LIMA ONE SIX, BE ADVISED,
  IN-FLIGHT EMERGENCY APPROACHING FROM THE EAST,
  REMAIN CLEAR OF LANDING SITE AND MAINTAIN RADIO SILENCE
  UNTIL EMERGENCY HAS BEEN TERMINATED - BREAK - WHISKEY
  ZERO TWO, CAN I BE OF FURTHER ASSISTANCE, OVER.
  Pilot: THIS IS WHISKEY ZERO TWO, NEGATIVE, OVER.
  Pathfinder: THIS IS LIMA ONE SIX, ROGER, OVER.
  3-68. The controller tells the emergency aircraft of any aircraft that remain on the landing site.
  Pathfinder: WHISKEY ZERO TWO, BE ADVISED, TWO UNIFORM HOTEL ONES
  ON NORTH END OF SITE.