(6)  Do this conditional inspection if one or more of the conditions that follow occur:
 (a)  
An airplane's flight path went through a cloud of volcanic ash.

 (b)  
Volcanic ash covers the airplane during ground operations (towing, taxiing, parking, etc.) during volcanic ash fallout conditions.

 (c)  
An airplane does a landing or takeoff during volcanic ash fallout conditions.

 WARNING:_______DO NOT BREATHE VOLCANIC ASH. DO NOT GET VOLCANIC ASH IN YOUR EYES. PUT ON A RESPIRATOR MASK THAT IS SUFFICIENT TO FILTER THE VOLCANIC ASH PARTICLES. ALSO PUT ON PROTECTIVE CLOTHES AND EYE GOGGLES. VOLCANIC ASH CAN CAUSE EYE IRRITATION AND INJURY TO THE RESPIRATORY SYSTEM.
 (7)  
Volcanic ash can cause discomfort to persons during fallout conditions. Precautions must be followed when you do work in a volcanic ash environment. This will prevent the entry of volcanic ash into the eyes and the respiratory system.

 (8)  
Air movement in positive or negative pressure vented cavities can cause particles of volcanic ash to collect. This is in non-pressurized parts of the airplane.

 B. References
 (1)  
12-11-03/301, Fuel Sump Servicing (Drainage)

 (2)  
12-14-01/301, Potable Water Tanks

 (3)  
21-25-01/401, Overhead Recirculating Fan

 (4)  
21-25-05/401, Overhead Recirculating Fan Filter Element

 (5)  
21-31-01/601, Valve - Pressurization Outflow

 (6)  
21-51-01/401, Flow Control and Shutoff Valve

 (7)  
21-51-03/401, Heat Exchanger

 (8)  
21-51-04/401, Air Cycle Machine (ACM)

 (9)  
21-51-05/201, Water Separator

 (10)
 21-51-06/401, Compressor Bypass Check Valve

 (11)
 21-51-14/401, Cooling Air Check Valve

 (12)
 21-51-15/401, Ram Air System Screen

 (13)
 21-61-08/401, Trim Air Supply Valve

 (14)
 21-62-01/401, ACM Turbine Bypass Valve

 (15)
 21-62-03/401, Ram Air Inlet Door Actuator

 (16)
 21-62-05/401, Ram Air Exit Door Actuator

 (17)
 27-81-03/201, Flap Pneumatic Drive Unit and Installed Components

 (18)
 28-11-03/401, Surge Tank Access Door

 (19)
 29-00-00/601, Hydraulic Power

 (20)
 29-11-08/401, Air-Driven Pump Turbine Drive

 (21)
 29-17-01/201, Reservoir Pressurization Module

 (22)
 30-11-03/401, Wind Anti-Ice Valve

 (23)
 30-21-03/401, Nacelle Anti-Ice Control Valve

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 05-51-35
 ALL  ú ú 02 Page 202 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (24)
 30-81-01/401, Ice Detector Probe

 (25)
 34-11-01/601, Probe - Pitot Static

 (26)
 34-12-02/401, Probe - Total Air Temperature

 (27)
 34-12-03/401, Sensor - Angle of Attack

 (28)
 35-11-18/401, Mask/Regulator/Stowage Box

 (29)
 35-21-04/401, Continuous Flow Control Unit

 (30)
 36-11-02/401, Intermediate Bleed Port Check Valve

 (31)
 AMM 36-11-03/401, HP Offtake Duct Pressure Relief Valve

 (32)
 36-11-04/401, Pressure Regulating and Shutoff Valve

 (33)
 36-11-05/401, High-Stage Bleed Air Valve

 (34)
 36-11-07/401, Wing Isolation Valve

 (35)
 36-11-08/401, APU Check Valve

 (36)
 36-11-09/401, APU Bleed Air (Shutoff Valve)

 (37)
 36-11-19/401, Pressure Regulating Valve

 (38)
 36-12-01/401, Bleed Air Precooler (Heat Exchanger)

 (39)
 36-12-04/401, Precooler Cooling Air Valve

 (40)
 38-14-01/401, Transmitter - Water Quantity

 (41)
 38-15-03/401, Compressor - Air

 (42)
 38-15-04/201, Filter - Air

 (43)
 38-15-05/401, Valve - Check

 (44)
 49-21-00/601, APU Engine

 (45)
 49-27-03/401, Oil Filter Element

 (46)
 49-27-04/601, Chip Detector
　
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