757
MAINTENANCE MANUAL

 S 212-041
 (31)
 Examine the Vacuum Pressure Relief Valve for volcanic ash (AMM 21-32-02).

 S 022-042

 (32)
 Remove the Pack Low Limit Control Valves for examination (AMM 21-51-11).

 S 212-043

 (33)
 Examine the Pack Low Limit Control Valves for volcanic ash (AMM 21-51-11).

 S 022-044

 (34)
 Remove the Pack Temperature Control Valves for examination (AMM 21-51-12).

 S 212-045

 (35)
 Examine the Pack Temperature Control Valves for volcanic ash (AMM 21-51-12).

 S 022-046

 (36)
 Remove the Trim Air Supply Check Valves for examination.  This step is optional to the airline if it is found necessary to clean the total Equipment Cooling System. But, this step could prevent a possible shorter component service life (AMM 21-61-05).

 S 022-047

 (37)
 Remove the Trim Air Pressure Regulating Valve for examination.  This step is optional to the airline if it is found necessary to clean the total Equipment Cooling system. But, this step could prevent a possible shorter component service life (AMM 21-61-06).

 S 022-048

 (38)
 Remove the Trim Air Modulating Valves for examination.  This step is optional to the airline if it is found necessary to clean the total Equipment Cooling System. But, this step could prevent a possible shorter component service life (AMM 21-61-07).

 S 022-049

 (39)
 Remove the Air Cycle Machine (ACM) for examination.  This step is optional to the airline if it is found necessary to clean the total Equipment Cooling System. But, this step could prevent a possible shorter component service life (AMM 21-51-03).

 S 212-050

 (40)
 Examine the Ram Air Inlet Door Actuators for volcanic ash (AMM 21-53-03).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 212-051
 (41) Examine, if installed, the Ram Air Exhaust Door Actuators for volcanic ash (AMM 21-53-04).
 G. Pneumatic System Examination
 S 212-052
 (1)  
Examine the Air Supply Precoolers. If signs of volcanic ash are found, remove the precooler (AMM 36-11-15).

 S 212-053

 (2)  
Examine the High Pressure Shutoff Valve. If signs of volcanic ash are found, remove the shutoff valve (AMM 36-11-07).

 S 212-054

 (3)  
Examine the Air Supply Intermediate Pressure Shutoff Valve. If signs of volcanic ash are found, remove the shutoff valve (AMM 36-11-06).

 S 212-055

 (4)  
Examine the Fan Air Modulating Valve. If signs of volcanic ash are found, remove the modulating valve (AMM 36-11-16).

 NOTE: Look in the outlet side of the components in the last four
____ steps (Air Supply Precoolers, High Pressure Shutoff Valve, Air Supply Immediate Pressure Shutoff Valve, and the Fan Air Modulating Valve). If there is no volcanic ash found, the procedure to examine the Pneumatic System is complete. The remaining pneumatic system steps are not necessary.
 S 212-056
 (5)  
Remove the Air Supply Pressure Regulating and Shutoff Valve to be examined (AMM 36-11-09).

 S 212-057

 (6)  
Examine the Air Supply Pressure Regulating and Shutoff Valve for volcanic ash (AMM 36-11-09).

 (7)  
Remove the Isolation Valve to be examined (AMM 36-11-04).

 (8)  
Examine the Isolation Valve for volcanic ash (AMM 36-11-04).

 (9)  
Remove the APU Air Supply Check Valve to be examined (AMM 36-11-11).

 S 212-061

 (10)
 Examine the APU Air Supply Check Valve for volcanic ash
 (AMM 36-11-11).

 S 022-058
 S 212-059
 S 022-060
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