Communications: electrical – Aircraft alarm or indicating systems – Flight alarm
Patent
1998-06-24
1999-11-16
Lee, Benjamin C.
Communications: electrical
Aircraft alarm or indicating systems
Flight alarm
340946, 340945, 340963, 340964, 340966, 340968, 340969, 340970, 340971, 340973, G08B 2300
Patent
active
059865822
ABSTRACT:
A two-stage alarm for a rotary wing aircraft, such as a helicopter which operates on a collective control arm. A moveable mass or weight is operatively connected to the collective control arm. The moveable weight may be of a reciprocating type or a rotor driven mass which is mounted eccentrically for rotation about an axs which is spaced from the center of gravity of the weight. In the latter case, a D.C. motor spins the weight rapidly about the axis at a first speed to produce a shaking action to the collective control arm as a warning of an approaching danger. The weight is moved more rapidly to produce a much more noticeable action at a second frequency, or at an increased amplitude as a warning of a more imminent or serious condition which requires immediate action.
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Greene Leonard M.
Greene Randall A.
Lee Benjamin C.
Safe Flight Instrument Corporation
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