S 212-015

 (8)  
Remove the turbine bypass valves examine them for signs of volcanic ash (Ref 21-62-01/401).

 S 212-016

 (9)  
Remove the compressor bypass check valves and examine them for signs of volcanic ash (Ref 21-51-06/401).

 S 332-017

 (10)
 Remove the trim air modulating valves and examine them for signs of volcanic ash (Ref 21-61-08/401).

 S 212-018

 (11)
 Examine the ram air inlet door actuators and examine them for signs of volcanic ash (Ref 21-62-03/401).

 S 212-019

 (12)
 Examine the ram air exit louver actuators and examine them for signs of volcanic ash (Ref 21-62-05/401).

 S 212-020

 (13)
 Remove the ram air inlet screens (if they are installed) and examine for them for signs of volcanic ash (Ref 21-51-15/401).

 S 212-021

 (14)
 Remove the ram air inlet check valves and examine for them for signs of volcanic ash (Ref 21-51-14/401).

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747-400
MAINTENANCE MANUAL

 S 212-022
 (15)
 Remove the air cycle pack heat exchangers and examine for them for signs of volcanic ash (Ref 21-51-03/401).

 S 212-023

 (16)
 Remove the overhead recirculating fans and screens for signs of volcanic ash (Ref 21-25-01/401).

 S 212-081

 (17)
 Remove the overhead recirculating fan filter elements and examine them for signs of volcanic ash (Ref 21-25-01/401).

 S 212-024

 (18)
 Examine the outflow valve for signs of volcanic ash (Ref 21-31-01/601).

 S 212-025

 (19)
 Remove the electrical/electronic cooling centrifugal air cleaner and examine it for signs of volcanic ash.

 S 212-026

 (20)
 Remove the electrical/electronic cooling ground exhaust skin valve and examine it for signs of volcanic ash.

 S 212-027

 (21)
 Remove the electrical/electronic cooling smoke override skin valve and examine it for signs of volcanic ash.

 S 212-028

 (22)
 Remove the electrical/electronic cooling inboard exhaust valve and examine it for signs of volcanic ash.

 S 212-082

 (23)
 Remove the electrical/electronic cooling inboard supply valve and examine it for signs of volcanic ash.

 S 212-083

 (24)
 Remove the electrical/electronic cooling bypass valve and examine it for signs of volcanic ash.

 S 212-029

 (25)
 Remove the electrical/electronic cooling supply and exhaust fans and examine them for signs of volcanic ash.

 S 212-030

 (26)
 Open the access doors to the electrical/electronic bay power panels and look for signs of volcanic ash.

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747-400 MAINTENANCE MANUAL
 G. Examine the Pneumatic System
 S 212-031
 (1)  Remove the bleed air precoolers (heat exchanger) and examine them for signs of volcanic ash (Ref 32-12-01/401).
 NOTE: If signs of volcanic ash are not found in the outlet side of
____ the bleed air precooler, the procedure to examine the pneumatic system is complete. The remaining steps in the Examine the Pneumatic System are not necessary.
 S 212-032
 (2)  
Remove the high stage bleed air valves and examine them for signs of volcanic ash (Ref 36-11-05/401).

 S 212-033

 (3)  
Remove the pressure regulating and shutoff valves and examine them for signs of volcanic ash (Ref 36-11-04/401).

 S 212-034

 (4)  
Remove the intermediate bleed port check valves and examine them for signs of volcanic ash (Ref 36-11-02/401).

 S 212-035

 (5)  
If installed, remove the pressure relief valves and examine them for signs of volcanic ash (Ref 36-11-03/401).
　
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