S 212-079

 (9)  
Disconnect the bleed air lines of the APU compressor and examine them for signs of volcanic ash (AMM 49-53-00).

 S 212-058

 (10)
 Remove the APU electrical and pneumatic control valves and examine them for signs of volcanic ash (Ref 49-52-03/401).

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747-400 MAINTENANCE MANUALExamine the Potable Water System S 212-059
 (1)  Remove the air filters that follow and look for signs of volcanic
 ash (Ref 38-15-04/201):
 NOTE: If there are no signs volcanic ash in the air filters, the____
 procedure to examine the Potable Water System is completed.
 The remaining steps to examine the Potable Water System are
 not necessary.
 (a) The Bleed Air filter
 (b) The Compressor Intake air filter
 (c) The Compressor Outlet air filter.
 S 212-060
 (2)  Remove the potable water compressor and look for signs of volcanic
 ash (Ref 38-15-03/401).
 S 212-061
 (3)  Get a water sample from the water tanks and examine them for signs
 of volcanic ash contamination (Ref 12-14-01/301).
 S 212-062
 (4)  Remove the potable water pressurization check valves and look for
 signs of volcanic ash contamination (Ref 38-15-05/401).
 S 212-063
 (5)  Remove the Water Quantity Transmitters and look for signs of
 volcanic ash (Ref 38-14-01/401).

Examine the Smoke Detectors
 S 212-064
 (1)  
Examine the smoke detectors of the cargo compartment for signs of volcanic ash. If there are signs of ash, replace the detector units.

 S 212-085

 (2)  
Examine the smoke detectors of the equipment cooling system for signs of volcanic ash. If there are signs of ash, replace the detector units.

Examine the Fire Extinguisher Bottle Nozzles
 S 212-065
 (1)  Examine the fire extinguisher bottle nozzles in the areas that follow for signs of volcanic ash contamination:
 (a)  
The Engines

 (b)  
The APU

 (c)  
The Lower Cargo Compartment

 (d)  
The Main Deck

 (e)  
The Lower Lobe Galleys.

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747-400 MAINTENANCE MANUAL
 O. Examine All Engine Accessories
 S 212-066
 (1)  Examine all engine accessories (this includes the constant speed drive and the oil cooler). Look for signs of volcanic ash contamination .
 P. Examine the Landing Gear
 S 212-067
 (1)  Examine the landing gear for signs of volcanic ash contamination. Do the steps that follow:
 (a)  
Examine the bare inner cylinders of the body, wing, and nose landing gear shocks struts.

 (b)  
Examine the bare piston rods of all hydraulic actuators.

 (c)  
Examine all of the attachment points of the landing gear components.

 (d)  
Examine all landing gear components that follow: 1) The door hinges 2) The lock mechanisms 3) The ground door release cables and pulleys 4) The ground door release handle bearings. 5) The door safety bar linkage bearings, tracks, and secondary

 cams for signs of volcanic ash.

 (e)  
Examine all cables and pulleys.

 (f)  
Examine the landing gear brakes.

 (g)  
Examine the brake metering valves.

 (h)  
Examine the proximity switches (sensors).

 (i)  
Examine the body, wing, and nose landing gear: 1) alternate extension system 2) electrical actuators and related drive mechanism.

 Q. Examine the Hydraulic System
 S 212-068
 (1)  Get samples of the hydraulic fluid and examine the samples for signs of volcanic ash contamination (Ref 29-00-00/601).
　
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