Figure 1-10. AADS Cutaway View showing Pitot Plumbing.

TM 9-1270-219-13&P

lower port. A heater element, housed in a mineral-isulated

a. H e a d

Assembly.

rod, is coiled into the front part of the head near the

surface to heat both pitot and static ports. The heater has

(1) The pitot port at the nose of the head assembly

pair

flexible

leads

for

connection

the

body

(fig. 1-10) connects to a pitot chamber near the back of

assembly, and dissipates 150 watts from the 115 Vac

which are two diametrically opposite drain holes which

400Hz supply which is connected via two sets of slip

e n s u r e the chamber is drained of ingested water with the

rings.

gimbal in any position. A stand pipe entering the chamber

from the rear has an opening near the nose so that pitot

b. T a i l A s s e m b l y . The tail assembly keeps the pitot-

pressure is conveyed through the head while water is

static head aligned with the air flow and has a stable

separated out and flows from the drains.

characteristic

flows

varying

direction.

The

a l u m i n i u m alloy tail shaft is slightly angled, as shown in

(2) Two static pressure ports are positioned on the

figure

1-12,

and

incorporates

two

balance

weights

outboard side of the head (fig. 1-11) where the airflow is

to statically balance the head, thus allowing accurate

unaffected by the body; the holes connect to a static

alignment with the air flow at less than 15 knots (the

chamber from which a pipe conveys static pressure to the

minimum downwash in hover), making the AADS stable

neck assembly. The static chamber is self draining via the

Figure 1-10. AADS Cutaway View showing Pitot Plumbing.

1-11