(5)  
Volcanic ash incidents that have occured to engines have shown that the ash will change conditions. As the ash goes through the combustor, it will change to between a plastic flow and molten condition. In this condition, it will have very high adhesive qualities and properties. The ash will bond to the nozzle guide vanes of the high pressure turbine. It will also bond to the rotor blades of the high pressure turbine. When the ash bonds to these components, it causes a decrease in the turbine flow area. It also causes a decrease of nozzle guide vane and turbine blade cooling air.

 (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)  
An airplane is covered with volcanic ash 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.

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 05-51-31
 ALL  ú ú 01 Page 201 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 WARNING:_______DO NOT BREATH VOLCANIC ASH. DO NOT GET VOLCANIC ASH IN YOUR EYES. PUT ON PROTECTIVE CLOTHES, EYE GOGGLES, AND A RESPIRATOR MASK THAT IS SUFFICIENT TO FILTER VOLCANIC ASH PARTICLES. 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 respiratory system.
 B. References
 (1)  
AMM 12-11-03/301, Fuel Sump - Draining

 (2)  
AMM 12-14-01/301, Potable Water System - Draining

 (3)  
AMM 21-25-01/401, Cabin Recirculation Air Fan

 (4)  
AMM 21-25-02/401, Recirculation Air Filter

 (5)  
AMM 21-25-03/401, Recirculation Air Check Valve

 (6)  
AMM 21-31-03/201, Cabin Pressure Outflow Valve

 (7)  
AMM 21-31-04/401, Cabin Pressure Outflow Valve Actuator

 (8)  
AMM 21-32-01/201, Positive Pressure Relief Valve

 (9)  
AMM 21-32-02/201, Vacuum Pressure Relief Valve

 (10)
 AMM 21-51-01/201, Flow Control and Shutoff Valve

 (11)
 AMM 21-51-02/401, Heat Exchangers

 (12)
 AMM 21-51-02/601, Heat Exchangers

 (13)
 AMM 21-51-03/401, Air Cycle Machine (ACM)

 (14)
 AMM 21-51-04/401, Water Extractor

 (15)
 AMM 21-51-11/201, Pack Low Limit Control Valve

 (16)
 AMM 21-51-12/401, Pack Temperature Control Valve

 (17)
 AMM 21-51-15/401, Cabin Air Supply Check Valve

 (18)
 AMM 21-51-15/601, Cabin Air Supply Check Valve

 (19)
 AMM 21-51-21/401, Secondary Water Extractor

 (20)
 AMM 21-53-01/401, Ram Air Inlet Door

 (21)
 AMM 21-53-02/401, Ram Air Exhaust Door

 (22)
 AMM 21-53-03/401, Ram Air Inlet Door Actuator

 (23)
 AMM 21-53-04/401, Ram Air Exhaust Door Actuator

 (24)
 AMM 21-58-05/401, Overboard Exhaust Valve

 (25)
 AMM 21-58-19/201, Equipment Cooling Smoke Sensor

 (26)
 AMM 21-61-05/401, Trim Air Supply Check Valve

 (27)
 AMM 21-61-06/401, Trim Air Pressure Regulating Valve

 (28)
 AMM 21-61-07/401, Trim Air Modulating Valve

 (29)
 AMM 24-11-01/401, Integrated Drive Generator

 (30)
 AMM 26-16-01/201, Cargo Smoke Detectors

 (31)
 AMM 26-16-02/401, Smoke Detector Blowers

 (32)
 AMM 26-20-00/001, Extinguishing

 (33)
 AMM 27-00-00, Flight Controls

 (34)
 AMM 28-11-03/401, Surge Tank Access Door

 (35)
 AMM 29-11-23/401, Reservoir Sampling Valve

 (36)
 AMM 29-11-16/401, Reservoir Pressurization Module

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