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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 212-086
 (2)  
Remove the air-driven pump turbine drives from the hydraulic system and examine them for signs of volcanic ash (Ref 29-11-08-/401).

 S 212-087

 (3)  
Remove and examine the pressurization modules of the hydraulic reservoirs (Ref 29-17-01/201).

 S 212-088

 (4)  
Examine the pressurization module components that follow for volcanic ash contamination:

 (a)  
The air filters

 (b)  
The air pressure regulators

 (c)  
The vent filters

 (d)  
The module check valves

 (e)  
The module bleed valves

 (f)  
The relief valve.

 S 212-089
 (5)  Remove the ADP in-line filters and water separators and do the steps that follow:
 (a)  
Examine for signs of volcanic ash contamination

 (b)  
Clean the course screen and water vents of the water separators.

 (c)  
Replace the air filters if it is necessary.

 R. Examine the Flight Controls
 S 212-069
 (1)  Do the steps that follow and examine the flight controls for signs of volcanic ash contamination:
 (a)  Examine the actuator bare piston rods of the components that follow: 1) The aileron 2) The elevator
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747-400 MAINTENANCE MANUAL
 3) The rudder
 4) The spoiler

 (b)  
Examine all control cables.

 (c)  
Examine the stabilizer jackscrew.

 (d)  
Examine all surface hinges of the flight controls.

 (e)  
Examine the track and flap mechanisms of the trailing edge flaps.

 (f)  
Examine the track fairings and linkages of the trailing edge flaps.

 (g)  
Examine the leading edge flaps, leading edge slats, and mechanisms.

 (h)  
Examine the elevator feel unit (cam and loading cylinder).

 S 212-070
 (2)  
Examine the section 48 internally for signs of volcanic ash.

 S 212-071

 (3)
Remove the pneumatic drive units of the leading edge flaps and examine them for signs of volcanic ash (Ref 27-81-03/201).

 S 212-072

 (4)  
Remove the thermal anti-ice valves of the wing and examine them for signs of volcanic ash (Ref 30-11-03/401).

 S 212-073

 (5)  
Remove the anti-ice control valves of the engines and nacelles and examine them for signs of volcanic ash (Ref 30-21-03/401).

 S. Examine the Airplane Internally
 S 212-074
 (1)  Examine the airplane internal areas that follow for signs of volcanic contamination:
 (a)  
The upper and main deck compartments

 (b)  
The closets

 (c)  
The passenger seats

 (d)  
The powered crew seats

 (e)  
The flight instruments

 (f)  
The electrical/electronic control panels

 (g)  
The floor coverings

 (h)  
The lavatories

 (i)  
The lavatory components

 (j)  
The galleys

 (k)  
The galley components 1) The refrigeration /chiller units 2) The food and beverage units (if they are installed) 3) The personnel/cart elevator of the lower lobe galley 4) The cart lift of the upper deck (if it is installed).

 (l)  
Examine the baggage/cargo systems for signs of volcanic ash contamination.

 (m)  
Examine the main electrical/electronics bay and compartments for volcanic ash contamination.

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