APR 2017 Chapter 95 Instrument System Page 95.5
95-20 Primary Instruments
95-21 Vertical Speed Indicator
A. Description
The vertical speed indicator indicates rate of ascent or descent. Check vertical speed
indicator for a zero-rate needle indication when rotorcraft is in a stationary hover.
B. Schematic
Refer to Figure 95-3 for pitot-static system schematic.
C. Removal
CAUTION
Protect instrumentation using foam padding or equivalent.
Handle instruments like eggs.
1. Turn battery switch off and pull out applicable circuit breaker(s).
2. Remove perimeter screws securing face to console and pull face aft.
3. Remove screws securing instrument to face.
4. Disconnect wiring as applicable.
5. Disconnect pitot/static lines and cap & plug instrument and system fittings, as
applicable.
6. Remove instrument and place on foam padding.
FIGURE 95-3 PITOT - STATIC SYSTEM SCHEMATIC
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