(2)  
An airplane is engulfed in volcanic ash fallout during ground operations (towing, taxiing, parking, etc.).

(3)  
An airplane encounters existing volcanic ash fallout during landing or takeoff.

F.  Volcanic ash can cause personnel discomfort during the time of exposure. Precautions should be taken when working in a volcanic ash environment to prevent volcanic ash entering the eyes and respiratory system.
WARNING:  VOLCANIC ASH CAN CAUSE EYE IRRITATION AND MAY BE HAZARDOUS TO THE RESPIRATORY SYSTEM. PERSONNEL ENCOUNTERING VOLCANIC ASH CONDITIONS SHOULD WEAR PROTECTIVE CLOTHING, EYE GOGGLES, AND A RESPIRATOR MASK SUFFICIENT TO FILTER VOLCANIC ASH PARTICLES.
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2.  Volcanic Ash Conditional Inspection
A.  When volcanic ash is encountered, examine the following:
(1)  
Examine frontal surfaces of fuselage (including weather radar radome), wing, engine nacelles, vertical stabilizer, and horizontal stabilizer for abrasion.

(a)  
Examine wing leading edges for dents and allowable skin thickness per Structural Repair Manual.

(b)  
Examine wing leading edge for roughness (Ref 27-81-21 I/C).

(2)  
Examine windshields and windows for abrasion damage which obscures vision.

(3)  
Examine engines for damage (Ref P&WA Chapter 72, Inspection/Check).

(4)  
Examine engine control mechanisms and linkages for evidence of volcanic ash.

(5)  
Examine pitot/static probes and static ports and PT2 probes for volcanic ash accumulation and plugged condition.

(6)  
Examine pneumatic system as follows:

(a)  
Remove bleed air precoolers (heat exchanger) (Ref 36-12-21) and examine for evidence of volcanic ash.

NOTE:  If no evidence of volcanic ash is found in bleed air and fan air outlets of bleed air precoolers, examination of pneumatic system is complete and remainder of par. (6) may be omitted.

(b)  
Remove 13th stage bleed air valves (Ref 21-11-11) and examine for evidence of volcanic ash.

(c)  
Remove bleed air valves (Ref 36-11-11) and examine for evidence of volcanic ash.

(d)  
Remove 8th stage bleed air check valves (Ref 36-11-31) and examine for evidence of volcanic ash.

(e)  
Remove pressure relief valves (Ref 36-11-0) and examine for evidence of volcanic ash.

(f)  
Remove precooler cooling air valves (Ref 36-12-31) and examine for evidence of volcanic ash.

(g)  
Remove isolation valve (Ref 36-11-21) and examine for evidence of volcanic ash.

(h)  
Remove APU check valve (Ref 36-11-51) and examine for evidence of volcanic ash.

(i)  
Remove APU bleed air (shutoff) valve (Ref 49-52-11) and examine for evidence of volcanic ash.

(j)  
Examine ground air connector for evidence of volcanic ash.

(k)  
Check operation of duct pressure transmitters (Ref 36-21-11).

(7)  
Examine air conditioning system as follows:

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(a)  Remove water separators (Ref 21-51-31) and examine for evidence of volcanic ash.
NOTE:  If no evidence of volcanic ash is found in water separators, examination of air conditioning system is complete and remainder of par. (7) may be omitted.
If APU was in operation and supplying air to an airconditioning pack, then pack inspection is required.
(b)  
Remove air cycle pack heat exchangers (Ref 21-51-21) and examine for evidence of volcanic ash.

(c)  
Remove air cycle machines (Ref 21-51-11) and examine for evidence of volcanic ash.

(d)  
Remove pack flow control valves (Ref 21-11-21) and examine for evidence of volcanic ash.

(e)  
Remove turbofans (Ref 21-52-61) and examine for evidence of volcanic ash.

(f)  
Examine outflow valve for evidence of volcanic ash.

(8)  
Examine exterior light lenses for abrasion.

(9)  
Examine fuel system as follows:

(a)  
Obtain fuel sample from each fuel tank sump (Ref 12-11-0) and examine samples for evidence of volcanic ash.

(b)  
Obtain fuel sample from each surge tank sump (if fuel is present in surge tanks) (Ref 12-11-0) and examine sample for evidence of volcanic ash.

(c)  
Examine interior of each surge tank (Ref 28-11-11) for evident of volcanic ash.
　
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