VERTICAL SPEED INDICATOR

DESCRIPTION - The pilot and gunner vertical speed indicator displays the helicopter ascent and descent speed in feet per minute. The indicator is actuated by the rate of atmospheric pressure change.

This instrument is connected to the static air system.

Pitot Static System

1. Static Drain  10. Altimeter ( Pilots ) 19.Air Data Pressure Transducer
2. Pitot Drain 11. Vertical Speed Indicator ( Pilots ) 20. Restrictor--Tee ( Pilot Drain )
3. Union Tee 12. Airspeed Indicator ( Pilots ) 21. Pipe Tee
4. Altimeters ( Gunners ) 13. Pitot Tube 22. Free Air Temp Gage Case
5. Vertical Speed Indicator ( Gunners ) 14. Pipe Elbow 23. Case Washer
6. Airspeed Indicator ( Gunners ) 15. Pipe Union 24. Dished Washer
7. Standby Compass 16. Pipe Tee 25. Grommet
8. Static Port 17. Pipe Tee 26. Sunshield
9. Pipe Tee 18. Static Port
Description-- Pitot-Static System 

The pitot-static system consists of the electrically heated pitot tube, two static ports, pitot and static drains, and pitot and static lines necessary to connect to airspeed indicators, altimeters, vertical speed indicator, and air data pressure transducer. The pitot tube is mounted on the upper left side of the forward pylon fairing. The static ports are located one on each side of the pitot section, in line with instrument panel.