As the helicopter descended rapidly towards the surface, the pilots would have experienced a certain degree of ground rush, which likely caused the PF to raise the collective and apply aft cyclic to decrease their perceived groundspeed and rate of closure with the water. This would have also contributed to the low main rotor rpm and airspeed conditions that developed, as well as a misjudgement of height for the initiation of the autorotative flare. At the normal flare height of 100 feet, indicated airspeed was significantly less than the 85 KIAS minimum recommended in the RFM. Likewise, main rotor rpm had decreased to 81%, which is significantly lower than the minimum power off limit of 95% rotor rpm, and even further from the recommended rotor rpm of 105%. Main rotor rpm and airspeeds this low would have resulted in significant loss of control authority and very little kinetic energy for the autorotative flare and subsequent application of collective for landing. In this occurrence, the airspeed and rotor rpm values prior to the flare would normally be expected during the final stages of cushioning an autorotative landing. Downwind, with low airspeed and very low main rotor rpm, the early application of collective and cyclic during final approach caused the main rotor to decay to the point where the main rotor blades likely reached a stalled condition. This would have caused the helicopter rate of descent to increase dramatically during the final seconds before impact, such that it would be impossible to recover prior to impact. The pilots experienced difficulties controlling the helicopter following the engine shut-down, placing the helicopter in a downwind autorotative descent with main rotor rpm and airspeed well below prescribed RFM limits. This led to an excessive rate of descent from which the pilots could not recover prior to impact.
Denelle, e-mail, 22.02.2021 02:13
Uses: Originally developed to ferry people and cargo to offshore oil platforms, S-76 helicopters are now widely used for executive and V.I.P. passenger transportation, for search-and-rescue work and as air ambulances. The manufacturer said that 10 countries use them to transport their heads of state.
lanje, 03.09.2013 12:54
wherz d price bey....
Ayub, e-mail, 13.08.2011 13:37
Hi,its really a good and really help full for rescue purpose. Now i am going to perform my job on this helicopter in KSA. Would u please be intimate me the avionics system updates and technical specification of the system is installed on it? i m waiting.
gar vak, e-mail, 25.05.2011 04:39
the s-92 has been going forward as the canadian armed forces as the cyclone ch-148.it will be the first full fly by wire military asw aircraft and sub hunter.the canadian forces have had 6 craft with enough intel yo fly and practice while all the comp info is done.it is suppose to be the best in the west and maybe world yea world.
ales.majer, e-mail, 23.04.2011 13:26
nou.koment
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