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VVI
- Usado para
- vertical velocity indicator
- Sinônimos
- VSI
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Part III: investigation. Montreal, 2011. (Doc. 9756 AN/965).
- Contexto
- A movable vertical velocity pointer indicates rate of climb or descent against a fixed tape scale. When these limits are reached, the vertical velocity pointer becomes fixed and the aircraft’s vertical rate of change is read against a movable tape scale. Analysis of the VVI is identical to the Airspeed-Mach Indicator in that the tapes will hold the readings existing upon loss of electrical signal. If the visible tapes are not discernable, disassemble the unit to the extent necessary to view undamaged or readable tape and interpolate the reading being presented.
- Analysis of the vertical velocity indicator (VVI) or vertical speed indicators (VSI) consists of an examination of the dial face for evidence of pointer impact marks and an internal examination of the sector and pinion gear for gear teeth damage resulting from impact. The vertical velocity indicator has a built-in time-delay feature and may not keep up with the aircraft if abrupt changes are made.