component locations and the oxygen flow; table 8-2
HP AND LP AIRCRAFT SERVICING.--The
describes the functions of the servicing controls and
HP and LP aircraft oxygen servicing operational
indicators as shown in figure 8-12.
function involves the mobile servicing of aircraft
Table 8-2.--Servicing Controls and Indicators
ITEM
NAME
FUNCTION
Hand valves on nitrogen Isolates the nitrogen storage cylinders.
3
gas storage cylinders
Hand valve on oxygen gas Isolates the oxygen gas storage cylinder.
4
storage cylinder
Nitrogen supply pressure Displays nitrogen cylinder gas pressure.
5
gauge on nitrogen module
Oxygen supply pressure Displays oxygen cylinder gas pressure.
7
gauge on oxygen module
Nitrogen supply valve on Prevents nitrogen flowing to a pre-set pressure regulator when
8
nitrogen module
recharging the nitrogen gas storage cylinder.
Boost pump drive pressure Displays nitrogen gas or air pressure being delivered to the boost
14
gauge on nitrogen module pump.
Boost pump drive valve on Vents the boost pump drive gas pressure and nitrogen module gas
15
nitrogen module
line pressure for parts disconnecting.
LP burst disc
Prevents the boost pump drive air pressure from exceeding 180
16
psig.
Boost pump drive valve on Provides positive control of air or nitrogen gas to the boost pump.
17
nitrogen module
Selector valve on oxygen Provides control of oxygen delivered to the boost pump or
19
module
bypasses oxygen around the boost pump. Also, provides system
off control.
Relief valve in oxygen Relieves excess pressure if boost pump outlet pressure exceeds
24
module
2900 psig.
Oxygen vent valve on Vents oxygen gas upstream of regulator.
27
oxygen module
Regulator inlet pressure Displays inlet gas pressure to the oxygen regulator.
28
gauge on oxygen module
Oxygen regulator in oxy- Regulates oxygen delivery pressure to the aircraft oxygen gas
29
gen module
storage system.
Regulator outlet pressure Displays outlet gas pressure of oxygen regulator.
30
gauge on oxygen module
Service valve on service Positive control for ON-OFF delivery to aircraft storage system.
33
equipment
Vents upstream pressures for parts disconnect.
Low pressure service Prevents low pressure aircraft oxygen gas storage system from
37
adapter burst disc
exceeding 600 psig.
High pressure service Prevents high pressure aircraft oxygen gas storage system from
38
adapter burst disc
exceeding 2400 psig.
8-20
