TM  1-1520-240-10            8-2-15 NOTE Aft  landing  gear  ground  proximity  switches are   not   actuated   during   a   water   landing. Therefore, longitudinal cyclic pitch actuators must be manually set to ground position. CAUTION If  contact  is  made  with  floating  debris, return to hover and assess damage. As the attitude approaches level, the helicopter will start moving  forward  and  stabilize  at  approximately  4  to  5 knots. This speed will be attained with the controls in neutral and the thrust control at the ground detent. The water level will not vary significantly because of GW or CG. As observed from the cockpit, the water level will appear to intersect the fuselage below the lower nose enclosure. 8-2-34.  Running Landing to Water. Running  landings  can  be  performed  within  the  limitations shown in Chapter 5, but should be performed only during training  missions,  actual  single-engine  conditions  when  a hovering  approach  is  not  possible,  or  when  atmospheric conditions dictate. Running landings for training should only be performed to calm water (Sea State 1 or less). Prior to performing a running landing to the water, the PITOT HEAT switch must be ON. The ramp, lower half of  the  cabin  door,  lower  rescue  door,  and  drain  plugs must be closed. Landing/searchlights shall be retracted. The approach is shallow and flown at an airspeed that provides safe aircraft control. Prior to water entry, it may be necessary to use the windshield wipers. Entry of the aft wheels into the water is easily recognized because the helicopter will decelerate noticeably. Touchdown atti- tude should be held constant until the apparent water speed has decreased below 10 knots. At or below 10 knots, the nose can be lowered to the water by lowering the thrust control rod and neutralizing the cyclic stick. A 4 to 5 knot forward speed will result when the helicopter is level and the controls are neutralized with the thrust control at the ground detent. NOTE Aft landing gear ground switches are not actu- ated during a water landing, Therefore, longitu- dinal cyclic pitch actuators must be manually set to ground position. When the helicopter is in the water, two-way communica- tion is lost on system whose antennas are submerged. The HF radio can be operated. 8-2-35.  After Landing. 1.   Flight controls — Neutralize. 2.    Cyclic trim indicators — Check GND indica- tion. F 3.   Ground contact lights — Check both ON. 4.   AFCS SYSTEM SEL switch — As required. 5.   SWIVEL switch — As required. 6.   Transponder — As required. 7.   Searchlight — As required. 8.   ANTI-ICE switches — OFF, as required. 8-2-36.  After Landing (Abbreviated). NOTE After  landing  and  while  conducting  subse- quent multiple takeoffs and landings (closed traffic,  slopes,  etc.)  the  Abbreviated  After Landing check may be used. 1.   Flight controls — Neutralize. 2.   Cyclic trim indicators — Check GND indica- tion. F 3.   Ground contact lights — Check both ON. 8-2-37.  Engine Shutdown. CAUTION Critical flight control components can be damaged if thrust is not in ground detent. 1.    Flight controls — Neutralize. Position the ped- als and cyclic at neutral and the thrust at the ground detent. 2.   PARKING BRAKE — Set. 3.   HTG switches — OFF. 4.    SLT-FIL switches — OFF and stow as re- quired. 5.   AFCS SYSTEM SEL switch — OFF. F 6.    Ramp — As required. F 7.   Wheels — Chocked. F 8.   Mission equipment — Safe as required. O 9.   HUD — OFF. F 10.   Fire guard — Posted. L  11.    APU — Start. For APU starting procedures, refer to paragraph 8-23. 12.   APU GEN switch — ON. 13.   GEN 1 and 2 switches — OFF.