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20
OPC BATTERY
Alerts (Fig. 34)
PRE-MISSION
POWER-UP
REPLACE BATTERIES
IMMEDIATELY
(prior to mission)
REPLACE BATTERIES
IMMEDIATELY
(prior to mission)
REPLACE BATTERIES
IMMEDIATELY
(Inoperable "Lock-Out" Mode)
Notes:
•
Replace the batteries immediately if any of the LOW BATTERY Alerts are indicated during the
PHODS PRE-FLIGHT CHECKLIST. DO NOT embark on a mission with weak batteries. A set of
fresh AA alkaline batteries should always be included as part of a "spares" kit.
•
If a mission is begun with a LOW BATTERY-1 Alert, the OPC unit may have no more than 2 hours
of operation remaining.
•
If a mission is begun with a LOW BATTERY-2 Alarm, the OPC unit may be on the verge of imminent
shut down.
•
If a LOW BATTERY-2 Alarm is received during a mission, the batteries should be replaced at the
first opportunity.
If operation is continued with a LOW BATTERY-2 Alarm and subsequent FLOW-FAULT Alarms are
•
received, this likely indicates that the oxygen-dispensing valve has ceased operating, and the OPC
unit is no longer dispensing oxygen (see BATTERY LIFE AND DEPLETION).
•
It is particularly important to heed BATTERY ALERTS in the course of missions conducted at higher altitudes.
•
The times for remaining operation ("Time-to-Failure") are approximations only, based on nominal
conditions (see BATTERY LIFE AND DEPLETION).
OPC
(Nominal)
TEST
LOW BATTERY-1
LOW BATTERY-2
BAD BATTERY
(Nominal)
LOW BATTERY-1
LOW BATTERY-2
LOW BATTERY-2
with FLOW-FAULT
Figure 34
PHODS User's Manual
IN-MISSION
less than 8 hrs remaining
REPLACE BATTERIES
AT FIRST OPPORTUNITY
less than 2 hrs remaining
REPLACE BATTERIES
AT FIRST OPPORTUNITY
No Longer Dispensing Oxygen
OXYGEN SYSTEM SHUTDOWN
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