l45 m 25 oxygenfam

7/28/2019 L45 M 25 OxygenFam

1/26

7/28/2019 L45 M 25 OxygenFam

2/26

L45 Mx Equipment and FurnishingsM2

Oxygen System

Overview Storage and indicating components

Crew oxygen distribution system

Passenger oxygen distribution system
http://localhost/var/www/apps/conversion/tmp/scratch_6/L45_M_Menua.ppt

7/28/2019 L45 M 25 OxygenFam

3/26


Oxygen OverviewOxygen System

Supplies crew with

supplemental

oxygen

Supplies oxygen

during abnormal

or emergency

situations

Uses high-pressure

storage system

Indicates quantity

and system status

on the EICAS

PRESSURE GAUGE

LOW-PRESSURERELIEF PORT

SHUTOFFREGULATOR

VALVE

HIGH-PRESSURERELIEF PORT

OXYGENCYLINDER

SERVICINGPORT

PRESSURE/TEMPERATURETRANSDUCER

7/28/2019 L45 M 25 OxygenFam

4/26


Oxygen Overview

OXYGEN CYLINDER

OXYGEN CYLINDER PRESSURE/TEMPERATURE TRANSDUCER

OXYGEN CYLINDER CHARGING VALVE

LOW-PRESSURE RELIEF VALVE

CREW OXYGEN MASK CONNECTION

PASSENGER OXYGEN CONTROL VALVE

ALTITUDE COMPENSATING REGULATOR (OPTIONAL)

PASSENGER OXYGENBLEED FITTING

PASSENGER OXYGEN

MASK CONTAINER(CABIN AREA)

OXYGEN CYLINDER SHUTOFF VALVE

OVERBOARD DISCHARGEINDICATOR

OXYGEN CYLINDERSHUTOFF/REGULATOR

CREW OXYGEN MASK CONNECTION

PASSENGER OXYGEN

MASK CONTAINER

(LAVATORY AREA)

PASSENGER OUTLET(TEST CONNECTION)

7/28/2019 L45 M 25 OxygenFam

5/26


Oxygen System




7/28/2019 L45 M 25 OxygenFam

6/26


Components

Storage cylinder Cylinder shutoff-regulator valve

Pressure gauge and charging valve

Cylinder pressure-temperature transducer Pressure switch

Discharge indicator

Control switch-indicators

Indication display

7/28/2019 L45 M 25 OxygenFam

7/26


ComponentsDischarge indicator

When high-pressure relief

disc ruptures,

oxygen cylinder

pressure expels

discharge

indicator from

its fitting

High-pressure

oxygen vents

overboard

7/28/2019 L45 M 25 OxygenFam

8/26


ComponentsTwo control

switch-indicatorsPAX OXY/AUTO

DEPLOY

7/28/2019 L45 M 25 OxygenFam

9/26


ComponentsIndication display

DAU collectsoxygen pressure

and temperature

information

EICAS displays

information

Message Condition

OXY PRESS HIOxygen pressure above 2500 psi.

Honeywell Phase II upgrade only.

OXYGEN OFFThe system pressure upstream of the passenger

oxygen control valve is less than 50 psi.

OXYGEN PRESS

The bottle pressure is not within the normal range

(either too high or too low).

Deleted with Honeywell Phase II upgrade.

OXYGEN QTY LOWOxygen quantity is below 554 liters (with 22-cubic-

foot bottle). Honeywell Phase II upgrade only.

PAX OXY FAIL

A failure of the passenger oxygen valve is detected.

Passenger oxygen mask deployment may not be

possible.

PAX OXY DEPLOYThe passenger masks have been manually or

automatically commanded to deploy.

7/28/2019 L45 M 25 OxygenFam

10/26


ComponentsIndication display

DAU collectsoxygen pressure

and temperature

information

EICAS displays

information

7/28/2019 L45 M 25 OxygenFam

11/26


Oxygen System




7/28/2019 L45 M 25 OxygenFam

12/26


Crew Oxygen Distribution System

Pressure-demand system availablewhen oxygen shutoff valve open

Quick-donning masks (upper

outboard corner of crew seat backs)

7/28/2019 L45 M 25 OxygenFam

13/26


ComponentsCrew masks

EROS

Diluter-demand

regulator

Microphone

One-hand donning

Four operatingmodes

-Normal

-100% oxygen

-Emergency

-Test

NORMAL ANDHALF-CIRCLE

100% ANDHALF-CIRCLE

EMERGENCY TEST

7/28/2019 L45 M 25 OxygenFam

14/26


ComponentsPuritan Bennett

masksDiluter-demand

regulator

Quick donning

Three operating

modes

-Normal

-100%

-Emergency

7/28/2019 L45 M 25 OxygenFam

15/26


ComponentsFlex hoses

Attach masksto oxygen

distribution

system

Quick disconnects

Lower cockpitsidewalls

Allow seats to be

removed without

disturbing oxygen

system (not shown)

OXYGEN CUP STOWAGEBOX CREW OXYGEN MASK

FLEX HOSE ASSY

CREW SEAT

OXYGEN OUTLET

SUPPLY FLEXHOSE ASSY

CREW SEATFLEX HOSE ASSY

7/28/2019 L45 M 25 OxygenFam

16/26


Oxygen System

Overview Storage and indicating

Overview

Components Crew oxygen distribution system


7/28/2019 L45 M 25 OxygenFam

17/26


Passenger Oxygen DistributionSystem Overview

Oxygen available to control

valve when shutoff valve is

open on oxygen cylinder

System pressurized only

when control valve is open

Continuous flow, rebreather-type system

7/28/2019 L45 M 25 OxygenFam

18/26


Components

Control panel Control valve

Dispensing units

Masks Bleed fitting

Passenger outlet (test connection)

Altitude compensating regulator(optional)

7/28/2019 L45 M 25 OxygenFam

19/26


ComponentsControl panel

Passenger oxygensystem controlled

through PAX

OXY/AUTO switch

indicator

7/28/2019 L45 M 25 OxygenFam

20/26


ComponentsControl valve

Two-way latchingsolenoid valve

with integral

pressure switch

7/28/2019 L45 M 25 OxygenFam

21/26


ComponentsSix dispensing units

Five inpassenger

compartment

headliner

One in aft

lavatory headliner

12 masks

Two in each

dispensing unit

Pulling mask

lanyard line

initiatesoxygen flow

OXYGEN CYLINDER

OXYGEN CYLINDERPRESSURE/TEMPERATURE TRANSDUCER


LOW PRESSURE RELIEF VALVE


PASSENGER OXYGEN





CREW OXYGEN MASKCONNECTION

PASSENGER OXYGEN

MASK CONTAINER

(LAVATORY AREA)



PASSENGEROXYGEN MASK

CONTAINER(CABIN AREA)

PASSENGEROXYGEN

MASK CONTAINER(LAVATORY AREA)

M

7/28/2019 L45 M 25 OxygenFam

22/26


ComponentsBleed fitting

Prevents smallleaks fromdeploying masks

Relieves pressureafter closingcontrol valve

Passenger outlet(test connection)Upper rightpassenger cabin(between FS 224and 235)

Allows periodic

pressure testsAltitude compensatingregulator (optional)Provides regulatedoutlet pressure as afunction of cabinaltitude

OXYGEN CYLINDER

OXYGEN CYLINDERPRESSURE/TEMPERATURE TRANSDUCER


LOW PRESSURE RELIEF VALVE


PASSENGER OXYGEN





CREW OXYGEN MASKCONNECTION

PASSENGER OXYGEN

MASK CONTAINER

(LAVATORY AREA)



ALTITUDE COMPENSATING

REGULATOR (OPTIONAL)

CREW OXYGENMASK CONNECTION

7/28/2019 L45 M 25 OxygenFam

23/26


System Operation

Automatic operationDeployed by cabin pressure

control system (CPCS) When cabin altitude reaches 14,000 250 feet,

CPCS signal opens cabin oxygen valve

PAX OXY/AUTO switch in

normal mode (off extinguished)

CPCS in AUTO mode

7/28/2019 L45 M 25 OxygenFam

24/26


System Operation

Manual operationPAX OXY/AUTO switch in OFF position

(OFF illuminates)

Cabin pressure controller bypassed

Passenger oxygen masks do not deploy

by CPCS signal

To operate passenger oxygen system

depress DEPLOY switch (ON illuminates)and masks deploy

7/28/2019 L45 M 25 OxygenFam

25/26


Questions?

7/28/2019 L45 M 25 OxygenFam

26/26

l45 m 25 oxygenfam

Documents