05-51-55
 ALL  ú ú 01 Page 202 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 VOLCANIC ASH CONDITION - MAINTENANCE PRACTICES
______________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A.  This procedure has a task to inspect the airplane for damage caused by volcanic ash.
 TASK 05-51-57-212-040
 2.  Volcanic Ash Conditional Inspection___________________________________
 A.  General
 (1)  
Inspect the airplane if one of these conditions occur:

 (a)  
You fly the airplane through a cloud of volcanic ash.

 (b)  
Volcanic ash engulfs the airplane while it operates on the ground (towing, taxiing, parking, etc.).

 (c)  
The airplane lands or takes off in volcanic ash.

 (2)  
There are several indications of an in-flight volcanic ash encounter:

 (a)  
Electrostatic discharge across the windshields

 (b)  
A bright glow in the engine inlets possibly followed by engine failure

 (c)  
Decreased visibility through the windshields and windows.

 (3)  
Volcanic ash has these qualities:

 (a)  
it is highly abrasive

 (b)  
it is generally considered to be non-corrosive over the short term

 (c)  
it can remove corrosion resistant finish

 (d)  
it is made of small particles less than 5 microns with trace amounts more than 50 microns and resembles talcum powder

 (e)  
it clings to exposed lubricated surfaces

 (f)  
it can get into many conventional seals, the engine gas path, the air conditioning system, and other open areas.

 (g)  
it can damage parts that rotate and slide

 (h)  
it will probably not get in sealed bearings such as wheel bearings

 (i)  
it can be a hazard to the eyes and respiratory system.

 (4)
Remove the ash and repair the finish as soon as possible.

 (a)  Be careful not to rub the surface when you wash the airplane (AMM 12-40-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-57
 ALL  ú ú 02 Page 201 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WARNING: VOLCANIC ASH CAN IRRITATE YOU EYES AND BE A HAZARD TO YOUR
_______ RESPIRATORY SYSTEM. PROTECT YOUR EYES WITH GOGGLES. WEAR A RESPIRATOR MASK TO FILTER OUT ASH PARTICLES.
 (b) Obey this WARNING during all of this task.
 B. References
 (1)
AMM 05-51-21/201, Extreme Dust Condition-Maintenance Practices

 (2)
AMM 12-11-00/301, Fuel Servicing

 (3)
AMM 12-40-00/201, Cleaning and Washing

 (4)
AMM 21-21-00/001, Main Distribution Manifold

 (5)
AMM 21-21-23/401, Recirculation Fan Filter

 (6)
AMM 21-21-24/401, Recirculation Fan Check Valve

 (7)
AMM 21-31-11/401, Cabin Pressurization Outflow Valve

 (8)
AMM 21-32-21/401, Safety Relief Valve

 (9)
AMM 21-32-22/401, Safety Relief Valve Filter

 (10)
 AMM 21-51-05/401, Conditioned Air Check Valve

 (11)
 AMM 21-51-11/401, Air Cycle Machine (ACM)

 (12)
 AMM 21-51-21/401, Heat Exchangers

 (13)
 AMM 21-51-31/401, Water Separator

 (14)
 AMM 21-51-41/701, Water Separator Coalescer

 (15)
 AMM 21-51-51/401, 35 degree F Control Valve

 (16)
 AMM 21-51-71/401, Pack Valve

 (17)
 AMM 21-52-11/401, Ram Air Actuator

 (18)
 AMM 21-52-21/401, Ram Air Inlet Deflector

 (19)
 AMM 21-52-31/401, Water Separator

 (20)
 AMM 21-52-41/401, Ram Air Inlet Modulation Panel

 (21)
 AMM 21-52-61/401, Turbofan

 (22)
 AMM 21-52-71/401, Turbofan Valve

 (23)
 AMM 21-52-81/501, Ram Air Inlet Control Cables

 (24)
 AMM 21-58-31/401, Automatic Flow Control Valve
　
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