Section I. INTRODUCTION AND DESCRIPTION

TM 55-1730-226-13

I N T R O D U C T I O N AND DESCRIPTION

INTRODUCTION.

T h i s manual provides the operation and maintenance

1.1.1

i n s t r u c t i o n s for the Oxygen Servicing Unit,

P / N AA1730-1315, for use in servicing aircraft and

other equipment requiring pressurized oxygen. An

i l l u s t r a t e d parts breakdown is included to facilitate

a n y repair or maintenance.

1.1.2

T h e function of the Oxygen Servicing Unit is to pro-

v i d e a means of carrying standard high-pressure

o x y g e n bottles and of interconnecting them to provide

a regulated single output which can be adjusted for

pressure.

DESCRIPTION. (Refer to Figure 5-1)

G e n e r a l . T h e Oxygen Servicing Unit consists of eight

c y l i n d r i c a l tubes (17, figure 5-1), each of which can

house a standard high-pressure oxygen bottle lying

o n its side. T h e bottles are firmly secured near the

f o r w a r d end of the Oxygen Servicing Unit by means of

a large cap nut (22) which interfaces with the cap

t h r e a d s on the oxygen bottles. Pigtails (46, 47, and 48)

a n d a manifold (32) are used to interconnect the oxygen

b o t t l e s to provide a single output. Each pigtail is con-

n e c t e d to a check valve (37) to prevent backflow and,

t h e r e f o r e , l o s s of oxygen or pressure in the event that

a bottle is not connected. to each line or one or more

o f the oxygen bottles are empty or of low pressure. A

manual control valve (31), connected to the manifold,

i s used to supply the oxygen directly from the oxygen

b o t t l e ( s ) to the receiving equipment. In addition, the

m a n u a l control valve can be used to bleed the manifold.

An adjustable, dual-indicator regulator (26) controls

the oxygen output at the desired pressure. One indicator

provides an indication of the bottle(s) pressure and the