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 2)  If you find volcanic ash in the filters, remove and examine the Recirculating Air Fans (AMM 21-21-22/401). a) If you find volcanic ash in the fans, clean or replace
 the fans.
 (m)  
Remove and examine the Recirculation Air Check Valves (AMM 21-21-24/401). 1) If you find volcanic ash in the valves, clean or replace
the valves.
 (n)  
Remove and examine the Equipment Cooling Automatic Flow Control Valve (AMM 21-58-31/401). 1) If you find volcanic ash in the valve, remove or replace
the valve. Also, remove ash from the duct.
 (o)  
Remove and examine the Exhaust Fans (AMM 21-58-12/401) and Check Valves (AMM 21-58-51/401). 1) If you find volcanic ash in the fans or valves, clean or
replace the fans and valves.
 (p)  
AIRPLANES WITH EFIS; Remove and examine the EFIS Cooling Fans (AMM 21-58-81/401) and EFIS Cooling Check Valves (AMM 21-58-91/201). 1) If you find volcanic ash in the fans or valves, clean or
replace the fans and check valves.
 (q)  
AIRPLANES WITH EFIS; Remove and examine the EFIS cooling air cleaner (AMM 21-58-61/201). 1) If you find volcanic ash in the air cleaner, clean or
 replace the air cleaner.
 S 212-042
 (5)  Examine the following air conditioning system components if the air conditioning packs were operated during a sand/volcanic ash storm:
 (a) 
Remove and examine the Turbofan Valves (AMM 21-52-71/401).
1) If you find volcanic ash in the turbofan valves, clean or replace the valves.
 (b)  
Remove and examine the Turbofans (AMM 21-52-61/401).
1) If you find volcanic ash in the turbofans, clean or replace the turbofans.
 (c)  
Remove and examine the air cycle pack primary and secondary Heat Exchangers (AMM 21-51-21/401). 1) If you find volcanic ash in the heat exchangers, clean or
 replace the heat exchangers.
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737-300/400/500MAINTENANCE MANUAL
 (d)  
Remove and examine the pack 35 degree F Control Valves (AMM 21-51-51/401). 1) If you find volcanic ash in the control valves, clean or
replace the control valves.
 (e)  
Remove and examine the flow control Pack Valves (AMM 21-51-71/401). 1) If you find volcanic ash in the pack valves, clean or
replace the pack valves.
 (f)  
Remove and examine the Air Cycle Machine (ACM) (AMM 21-51-11/401). 1) If you you find volcanic ash in the ACM, clean or replace
 
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