(c)
Do not tighten the valve more than 25 inch-pounds maximum (hand tight).
(d)
Close the shutoff valve 1/4-turn and use lockwire to keep the valve in this position.
NOTE: Use the 0.020 inch diameter copper lockwire
____
(AMM 20-10-44/401).
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737-300/400/500MAINTENANCE MANUAL
S 864-048
(3) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) On the main power distribution panel, P6:
1) C018 or C020, INPH AND WARN, or
SERVICE INPH, or
OBS INPH
2) B021, CAPT AND AUDIO, or
CAPT AUDIO, or
CAPT AND OBS-INPH
3) B020, F/0 AUDIO, or
F/O AND E/R INPH, or
F/O INPH
4) C019, or C021 OBS AUDIO, or
FLT INPH AMPL or
INPH AMPL or
TRAINING INPH
S 414-049
(4) Put the mask/regulator in the storage box (AMM 35-12-85/201).
S 714-050
(5) Do the Operational Test of the Crew Oxygen System
(AMM 35-12-00/501).
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2.
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737-300/400/500MAINTENANCE MANUAL
PASSENGER OXYGEN SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________
General
_______
A. The passenger oxygen system supplies emergency oxygen to the passengers and attendants. The system contains service units, various control relays, altitude pressure (automatic) switch, passenger oxygen (manual) switch, and indicator lights.
B. Each passenger service unit (PSU) contains a chemical oxygen generator and an oxygen mask box. The mask box contains three or four oxygen masks and a door latch actuator (Fig. 1).
C. Each lavatory and attendant's oxygen mask box contains a chemical oxygen
generator, two oxygen masks and a door latch actuator.Chemical Oxygen Generator
_________________________
A. The generator supplies gaseous oxygen to the oxygen masks by rapid thermal decompositon of sodium chlorate and iron into salt, iron oxide, and oxygen.
B. The generator has a release pin which holds a cocked firing pin in position. Each oxygen mask lanyard in a mask box is attached to a common release cable. The release cable is attached to the release pin. When any mask lanyard is pulled, the firing pin is released and strikes the primer. This starts the chemical reaction in the generator. Once started, the reaction cannot be stopped until all of the chemicals have been used. A color band that is sensitive to heat is installed around the oxygen generator. The chemical reaction that occurs when the generator is fired, gives off heat and turns the color of the band black. A black band is an indication that the generator has fired and the generator must be replaced.
C. A filter removes all unwanted elements of the chemical reaction. A relief valve vents pressure above 90 psi. Oxygen flows through the filter and manifold to the mask.
D. Each oxygen generator in the passenger service unit has a single oxygen outlet which is connected to the manifold of the oxygen supply line for that passenger service unit. The generator is installed adjacent to the mask box in the service unit.
E. Each chemical oxygen generator in the attendant's and lavatory mask boxes, has two oxygen outlets to which the oxygen masks are directly connected. A generator is installed inside each lavatory and attendant's mask box.
Passenger Oxygen Mask
_____________________
A. The passenger oxygen mask assembly is a continuous flow unit of cup-shaped design with an oronasal type mask. A reservoir bag with a capacity of one liter is attached to the facepiece with a check valve at the mask. The mask is designed to conform with facial contours and may be held in position with an elastic head strap.
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