S 212-013

 (4)  
If the valve that follows was open during a volcanic ash fallout, clean the total Equipment Cooling System (AMM 21-58-00).

 (a)  Equipment Cooling Overboard Exhaust Valve.
 S 162-014
 (5)  
Clean the primary and secondary heat exchangers as necessary (AMM 21-51-02).

 (6)
Remove the primary Water Extractor for examination (AMM 21-51-04).

 S 022-015
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 (7)  S 162-016If volcanic ash is found in the water extractor, clean the Primary Water Extractor as necessary.
 (8)  S 022-017Remove the Secondary Water Extractor for examination (AMM 21-51-21).
 (9)  S 162-018If volcanic ash is found in the water extractor, clean the Secondary Water Extractor as necessary.
 S 022-019

 (10)
 Remove the pack Flow Control and Shutoff Valves for examination (AMM 21-51-01).

 S 212-020

 (11)
 Examine the pack Flow Control and Shutoff Valves for signs of volcanic ash (AMM 21-51-01).

 S 022-021

 (12)
 Remove the pack Heat Exchangers for examination (AMM 21-51-02).

 S 212-022

 (13)
 Examine the pack Heat Exchangers for signs of volcanic ash (AMM 21-51-02).

 S 022-023

 (14)
 Remove the Equipment Cooling Air Filters for examination (AMM 21-58-07).

 S 022-025

 (15)
 Remove the Recirculating Air Fans for examination (AMM 21-25-01/401)

 S 022-026

 (16)
 Examine the Recirculating Air Fans for signs of volcanic ash (AMM 21-25-01/401).

 S 212-027

 (17)
 Examine the Recirculation Air Filters for volcanic ash (AMM 21-25-02/401).

 S 022-028

 (18)
 Remove the Cabin Pressure Outflow Valve for examination (AMM 21-31-03).

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 S 212-029
 (19)
 Examine the Cabin Pressure Outflow Valve for volcanic ash (AMM 21-31-03).

 S 022-030

 (20)
 Remove the actuator for the Cabin Pressure Outflow Valve for examination (AMM 21-31-04).

 S 212-031

 (21)
 Examine the actuator for the Cabin Pressure Outflow Valve for volcanic ash (AMM 21-31-04).

 S 022-032

 (22)
 Remove the Cabin Air Supply Check Valves for examination (AMM 21-51-15).

 S 212-033

 (23)
 Examine the Cabin Air Supply Check Valves for volcanic ash (AMM 21-51-15).

 S 212-034

 (24)
 Examine the Overboard Exhaust Valve for volcanic ash.  If the valve was closed, remove the volcanic ash from the external surface (AMM 21-58-05).

 S 022-035

 (25)
 If the Overboard Exhaust Valve was open, remove the valve (AMM 21-58-05).

 S 022-036

 (26)
 Remove the Recirculation Air Check Valve for examination (AMM 21-25-03).

 S 212-037

 (27)
 Examine the Recirculation Air Check Valve for volcanic ash (AMM 21-25-03).

 S 022-038

 (28)
 Remove the Positive Pressure Relief Valve for examination (AMM 21-32-01).

 S 212-039

 (29)
 Examine the Positive Pressure Relief Valve for volcanic ash (AMM 21-32-01).

 S 022-040

 (30)
 Remove the Vacuum Pressure Relief Valve for examination (AMM 21-32-02).

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