(47)
 49-31-02/401, Fuel Metering Adapter

 (48)
 49-52-03/401, Air Cooled Oil Cooler

 (49)
 AMM 49-53-00, APU Surge Bleed System

 (50)
 71-00-00/601, Power Plant

 (51)
 72-00-00/601, Engine

 C. Airplane Leading Edge External Surfaces
 S 212-002
 (1)  Examine the airplane and look for abrasions in the areas that follow:
 (a)  
The front of the fuselage (this includes the weather radome)

 (b)  
The engine nacelles

 (c)  
The vertical stabilizer

 (d)  
The horizontal stabilizer

 (e)  
The wing 1) Examine wing the leading edge of the wing for dents. 2) Also, refer to the Structural Repair Manual to make sure

 the skin is at the correct thickness.
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 (f)  Windshield and Windows 1) Look for abrasion damage that will keep vision to a limit.
 D. Engines
 S 212-005
 (1)  Examine the PW4000 series engines to see if the volcanic ash ingestion caused damage (Ref 72-00-00/601).
 E. Probes and Sensors
 S 212-080
 (1)  Examine the probes and sensors as follows:
 (a)  
Examine the Pitot Static Probes to see if volcanic ash has collected or has caused blockage (Ref 34-11-01/601).

 (b)  
Examine the Angle-of-Attack Sensors to see if volcanic ash has collected of caused blockage (Ref 34-12-03/401).

 (c)  
Examine the Flush Static Prob Ports to see if volcanic ash has collected or caused blockage (Ref 34-11-01/601).

 (d)  
Examine the Total Air Temperature Probe(s) to see if volcanic ash has collected or caused blockage (Ref 34-12-02/401).

 (e)  
Examine the PT1 and PT2 Probes to see if volcanic ash has collected or caused blockage.

 (f)  
Examine the Ice Detector Probes (if applicable) to see if volcanic ash has collected or caused blockage (Ref 30-81-01/401).

 F. Air Conditioning System Examination
 S 212-008
 (1)  
Examine the Ram Air Inlet Doors. If volcanic ash is found, clean the doors, bearings, and movable joints, when it is necessary (Ref 21-62-03/401).

 S 212-009

 (2)  
Examine the Ram Air Exit Louvers. If volcanic ash is found, clean the louvers, bearings, and movable joints when it is necessary (Ref 21-62-05/401).

 S 282-010

 (3)  
Remove the water separators and examine them for volcanic ash contamination (Ref 21-62-05/401).

 (a)  If volcanic ash is found, clean the water separators and the coalescer bags if it is necessary.
 S 282-011
 (4)  Remove the pack flow control valves and examine them for signs of volcanic ash (Ref 21-51-01/401).
 NOTE: If signs of volcanic ash are found in this step, do the
____ examination for the pack flow control valve filter and orifice contamination.
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747-400 MAINTENANCE MANUAL
 S 212-012
 (5)  Remove the wing isolation valves and examine them for signs of volcanic ash (Ref 21-51-01/401).
 NOTE: If signs of volcanic ash are not found in the two steps
____ above, the procedure to examine the air conditioning system is complete. The remaining steps in the Air Conditioning System Examination are not necessary.
 The remaining steps are optional to the airline. But, this could prevent a possible shorter component service life if signs of volcanic ash are found in this step.
 S 212-013
 (6)  
Remove the master trim air valve and examine it for signs of volcanic ash (Ref 21-61-08/401).

 S 212-014

 (7)  
Remove the air cycle machines and examine them for signs of volcanic ash (AMM 21-51-04/401).
　
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