A. Not Applicable
 4. Procedure

_________
 Subtask 35-30-00-020-050

 A. Removal of the Protective Breathing Equipment
R (1) Remove and discard the protective breathing equipment from cockpit R and/or cabin (Ref. TASK 35-32-52-000-001).
 EFF : ALL
35-30-00Page 624

 Subtask 35-30-00-420-050
 B. Installation of the Protective Breathing Equipment
 (1) Put the new protective breathing equipment in position (Ref. TASK 35-32-52-400-001).
 EFF : ALL
35-30-00Page 625

 FLIGHT CREW PORTABLE DEVICES - DESCRIPTION AND OPERATION
________________________________________________________
 1. General
_______
 The flight crew portable oxygen will supply one crew member with protected breathing oxygen. It is used when fighting a fire and against the emission of smoke and noxious gas. It will also supply one crew member with emergency oxygen if a failure of the fixed oxygen system occurs when there has been a loss of cabin pressurization.
 2. Description___________
 A. Portable Oxygen Cylinder
 (1) The oxygen cylinder has a head that is made up of the following components: (Ref. Fig. 001)
 (a)
 A direct-reading pressure gage to show the cylinder pressure.

 (b)
 A high-pressure relief valve with a rupture disc. The disc will rupture at a pressure of 186.2 to 206.8 bar (2700 to 3000 psig). This pressure would be the result of an unusual rise in the temperature.

 (c)
 A rotary ON/OFF valve controls the oxygen flow into the high-pressure chamber of the pressure regulator.

 (d)
 A filling valve is directly connected to the high-pressure chamber of the pressure regulator. This valve permits the filling of the oxygen cylinder at a controlled flow. The filling speed must not be more than 20.7 bar/min (300 psi/min).

 (e)
 A pressure regulator to give a low-pressure of 4.4 bar (64 psig).

 (f)
 A low-pressure relief valve which will operate at a pressure of

 6.2 to 9.3 bar (90 to 135 psig).
 B. Full-Face Oxygen Mask
 (Ref. Fig. 002)

 (1) A full-face mask of the demand type is connected to the oxygen cylinder which will give protection against smoke and noxious gas. The mask will supply 100% oxygen through the demand regulator installed in the mask. The demand regulator has an aneroid capsule which gives a safety overpressure of approximately 3 mbar from 30,000 ft on.

 Flight-Crew Portable-Oxygen Cylinder
 Figure 001

 CES

 Flight-Crew Portable-Oxygen Equipment
 Figure 002

 CES

 (2)
 A flight crew member can communicate with the other crew members through the microphone and communication cable installed in the mask.

 (3)
 If the portable full-face mask has a failure, a flight crew member can connect his own full-face quick-donning mask. The quick-donning mask has to be set to 100% oxygen.

 FLIGHT CREW PORTABLE DEVICES - DESCRIPTION AND OPERATION
________________________________________________________
 1.
 General

_______

 2.
 Description

___________
 A. Smoke Hood System
 (1) General description (Ref. Fig. 001) The hood container is installed on the lateral panel 702VU, it is fitted with a tamper indicator that must be broken to allow access to the bag (which contains the hood). The container additionally provides an inspection window to allow observation of the enclosed vacuum-sealed bag.
 (a)
 Hood materials of construction

 -External exposed components: Hood: Double-sided teflon-impregnated fiberglass fabric Visor: Optically clear polycarbonate Adjustment strap: Nomex Adjustment buckles: Nickel-plated die-cast zinc External thermoplastic components: Ultem Speaking diaphragm: Kapton and glass filled nylon External elastomers: Silicone rubber
 -Internal materials: Neckseal: Latex film Exhalation circuit: Polyurethane film Canister discharge circuit: Teflon film Oronasal mask: Silicone rubber Chlorate candle: Stainless steel and brass KO2 (potassium superoxide) canister: Tin-plated carbon steel Canister/candle insulation: Ceramic fiber blanket and foil laminated ceramic fiber

 (b)
 General Features The smoke hood completely encloses the head of the wearer and seals at the neck with a thin elastic membrane. The large internal volume of the hood accommodates glasses and long hair while the elastic membrane neckseal enables fitting over the broad population range representative of aircraft crewmembers. The chemical air regeneration system is based on the use of potassium superoxide (KO2).
　
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