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14
R/M: "Reserve / Manual" Mode (Fig. 21)
The R/M ("Reserve/Manual") setting causes the OPC
to immediately begin providing an extremely enriched
oxygen flow. Operation commences (and continues)
regardless of pressure altitude.
Flow amount:
Altitude Compensating: Yes
Flow Start:
Use with:
Notes:
•
(¹) An extremely enriched but fixed amount of oxygen is delivered at all altitudes up to ~ 32,000 ft PA.
Above that, the amount of oxygen delivered increases with additional altitude (altitude compensating)
and is actually the same amount that would otherwise be delivered in ON mode in that altitude
range. See OXYGEN FLOW RATES (Fig. 23).
•
At lower altitudes, much more oxygen will be used than with ON mode, and oxygen duration will be
significantly decreased. R/M is by far the least efficient delivery setting in the lower altitude range.
•
R/M may also be considered "Recovery/Medical" mode as the flow provided is more on the order
of an emergency ventilation protocol. R/M may be used with discretion to "recover" from exertion or
to otherwise mitigate the effects of sudden hypoxia.
F20: "Facemask" Mode (Fig. 22)
The F20 setting is provided for use with a Facemask,
but may also be used with a cannula if more oxygen is
required than is otherwise provided by the ON mode
Operation commences (and continues) regardless of
pressure altitude.
Flow amount:
Altitude Compensating: Yes
Flow Start:
Use with:
Notes:
•
F20 setting augments the amount of oxygen otherwise provided at a given pressure altitude in order
to compensate for the additional plenum volume associated with a facemask.
•
More oxygen will be used than with ON mode, and oxygen duration will be decreased. See OXYGEN
FLOW RATES (Fig. 23).
•
Pilots making night approaches and landings may use the R/M or F20 modes to provide additional
oxygen in order to enhance night vision.
Extreme (
)
1
All altitudes
Facemask or Cannula
Enriched
All altitudes
Facemask or Cannula
PHODS User's Manual
Figure 21
Figure 22
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