Chapter 3 — WIND EQUIPMENT 



BRAKE 

 JAM NUTS 



VANE NOSE 



VERTICAL 

 EXTENSION TUBE 



HOUSING 



COVER 



RANGE SELECTING 

 TRIGGER 



DIRECTION SIGHT 



VANE LOCKING 

 TRIGGER 



WIND SPEED TRANSMITTER 

 T-32IB/PMO-3 



SCREWS 



MOUNTING HUB 



WIND VANE 

 ML-447B/PM0-3 



SCREW 



WIND SPEED INDICATOR 



ZERO ADJUSTMENT 



HANDLE 



, 09.122 



Figure 3-1. — Wind Measuring Set AN/PMQ-3( ). 



b. Grasp the instrument by the handle and 

 hold It in an approximately vertical position 

 at arm's length with the sight at eye level. 



c. Aim the instrument at a fixed orientation 

 point by aligning the center of the slot in the 

 front of the sight with the center of the strip 

 between the two slots on the rear sight and 

 the fixed orientation point. 



d. Press and hold the vane locking trigger. 

 Note the reading on the 0-60 (upper) scale on 

 the wind speed indicator. 



e. If the wind speed reading is less than 

 15 knots as indicated on the 0-60 scale, press 

 the range selecting trigger on the side of the 

 housing (3B and 3C models) or handle (3 and 

 3A models) and observe the indication on the 0-15 

 scale. 



CAUTION: The range selecting trigger 

 should not be pressed if the initial observation 

 of the wind speed indicator indicates a wind 

 speed in excess of 15 knots as mechanical 

 damage may result due to the slamming of 

 the pointer. 



f. The instant the wind speed indication is 

 noted, release the vane locking trigger and 

 carefully lower and tilt the instrument to 

 observe the wind direction reading on the 

 direction dial. 



CAUTION: After the vane locking trigger is 

 released, care must be taken not to disturb 

 the vane's position until the direction reading 

 is made. 



g. Observe the wind direction reading in 

 whole degrees and then record both the wind 

 direction and speed readings. 



37 



