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 Notify Dispatch. Flight Planning may be affected. OPERATIONS (O)
Passenger Oxygen System Inoperative:
 Plan flight over route with minimum enroute altitude equal to or lower than 14,000 feet.
 Maximum flight altitude shall not exceed FL 250.
 Prior to flight, the pilot in command shall brief cabin crew on the alternate emergency procedures that will be used.
Automatic Presentation System Inoperative:
 Be prepared to deploy passenger masks manually using the PASS OXY switch.
 Flight altitude is limited to FL300.
 
EICAS STATUS MESSAGES
None
PLACARD
As appropriate
MAINTENANCE (M)
 Stow the out-of-service unit in a place where it will not be used by mistake, until it can be removed from the airplane at the next available maintenance base.
 Ensure required distribution of serviceable units is maintained throughout the airplane.
 
REPAIR INTERVAL C 2 NUMBER INSTALLED
ITEM
36-11-1 ENG BLEED Pressure
Regulating and Shutoff
Valves (PRSOV) (L & R)   1 NUMBER REQUIRED FOR DISPATCH
    REMARKS OR EXCEPTIONS
(M) Except for ETOPS operations beyond 120 minutes, one may be inoperative provided:
 PRSOV is closed,
 Associated engine BLEED switch remains OFF,
 Airplane is not operated in known or forecast icing conditions,
 Remaining (opposite) engine bleed system and its associated pack operate normally, and
 Airplane remains at or below FL 350.

EICAS STATUS MESSAGES
None
PLACARD
Pneumatic control panel as appropriate - L(R) PRSOV INOP CLOSED
MAINTENANCE (M)
 Notify dispatch. Airplane operation, procedures and flight planning may be affected.
 Press BLEED AIR L and R ENG switchlight on pilots overhead P5 panel to OFF. Verify OFF lights come on.
 If OFF light does not come on:
1) Open applicable core cowls:
 418AR Left
 428AR Right
2) Rotate the manual override hex nut on the pressure regulating and shutoff valve clockwise until the poppet valve lever falls into the lock arm assembly notch. The word “LOCKED” should be visible on the valve body beneath the cam. Make sure the poppet valve lever is not in the detent position.
3) Close core cowls.
 
PRESSURE REGULATING AND SHUTOFF VALVE
 

 
OPERATIONS NOTE
1. Do not operate two air conditioning packs with air supplied from a single engine bleed source.
 
 Bleed air isolation valve is normally OFF.
 With the isolation valve OFF, and operating with a single bleed air source, wing and engine anti-ice are not available on the affected side.
 For left PRSOV inoperative, the left pack may be operated using APU bleed air below 17,000 feet.
　
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