(10)
Examine oxygen system (if cabin and cockpit contamination is reported) as follows:

(a)  
Remove diluter demand regulators (Ref 35-11-41) and/or mask/regulator stowage boxes (Ref 35-11-45) and examine for evidence of volcanic ash.

(b)  
Remove flow control units (Ref 35-21-21) and examine for evidence of volcanic ash.

(c)  
Examine portable oxygen cylinder masks for evidence of volcanic ash.

(d)  
Examine passenger and crew oxygen masks for evidence of volcanic ash.

(11)
Examine auxiliary power unit (APU) as follows:

(a)  Examine inlet and exhaust ducts for evidence of volcanic ash ingestion.
NOTE:  If no evidence of volcanic ash is found in APU inlet and exhaust ducts, examination of APU is complete and remainder of par. (11) may be omitted.
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(b)  
Remove oil, air, and fuel filters (Ref 49-91-11, 49-52-21, 49-31-21 SRV) and examine for evidence of volcanic ash.

(c)  
Disconnect compressor discharge pressure and bleed air lines (Ref 49-52-91 CP; 49-52-11 R/I) and examine for evidence of volcanic ash.

(d)  
Remove electrical and pneumatic control valves (Ref 49-61-21, 49-61-31 R/I) and examine for evidence of volcanic ash.

(12)
Examine potable water system as follows:

(a)  
Remove bleed air, compressor intake, and compressor outlet air filters (Ref 38-41-11) and examine for evidence of volcanic ash.

NOTE:  If no evidence of volcanic ash is found in air filters, examination of potable water system is complete and remainder of par. (12) may be omitted.

(b)  
Remove compressor (Ref 38-41-21) and examine for evidence of volcanic ash.

(c)  
Obtain water sample from water tanks (Ref 38-11-0) and examine for evidence of volcanic ash.

(d)  
Remove pressurization check valves (Ref 38-11-0 and 38-41-0) and examine for evidence of volcanic ash.

(e)  
Remove water quantity transmitters (Ref 38-11-21 and 38-11-22) and examine for evidence of volcanic ash.

(13)
On Passenger/Cargo Convertible airplanes, examine smoke detectors for evidence of volcanic ash.

(14)
Examine engine and APU fire extinguisher bottle nozzles for evidence of volcanic ash.

(15)
Examine constant speed drive and oil cooler for evidence of volcanic ash.

(16)
Examine landing gear as follows:

(a)  
Examine exposed inner cylinders of main and nose landing gear shocks struts for evidence of volcanic ash.

(b)  
Examine all hydraulic actuator exposed piston rods for evidence of volcanic ash.

(c)  
Examine all landing gear component attachment points for evidence of volcanic ash.

(d)  
Examine landing gear door hinges and lock mechanisms for evidence of volcanic ash.

(e)  
Examine main and nose gear manual release wheel well mechanisms for evidence of volcanic ash.

(f)  
Examine all cables and pulleys for evidence of volcanic ash.

(g)  
Examine landing gear brakes for evidence of volcanic ash.

(h)  
Examine landing gear selector valve and brake metering valves for evidence of volcanic ash.

(i)  
Examine proximity switches (sensors) for evidence of volcanic ash.

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(17)
Examine hydraulic system as follows:

(a)  
Obtain sample of hydraulic fluid (Ref 29-09-111) and examine for evidence of volcanic ash.

(b)  
Remove air pressure filter (Ref 29-09-321), and air pressure regulator (Ref 29-09-341), vent filter (Ref 29-09-331), check valves (Ref 29-11-101, 29-12-61, and 29-21-71), bleed valve (Ref 29-09-300), relief valves (Ref 29-09-351, 29-12-51, and 29-21-61), and charging valve (Ref 29-09-300) and examine for evidence of volcanic ash.

(18)
Examine flight controls as follows:

(a)  
Examine aileron, elevator, rudder, leading edge flap, leading edge slat, and spoiler actuator exposed piston rods for evidence of volcanic ash.

(b)  
Examine control cables in unpressurized area for evidence of volcanic ash.

(c)  
Examine stabilizer jackscrew for evidence of volcanic ash.

(d)  
Examine all flight control surface hinges for evidence of volcanic ash.

(e)  
Examine trailing edge flap tracks and flap mechanisms for evidence of volcanic ash.

(f)  
Examine trailing edge flap track fairings and linkages for evidence of volcanic ash.
　
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