B. Prepare for the Inspection
S 862-002
(1)
Remove the pressure from the left, center, and right hydraulic systems (Ref 29-11-00).
S 862-003
(2)
Put the L, C, and R FLT CONTROL SHUTOFF switches on sidewall panel, P61 to OFF.
S 862-004
(3)
Open these circuit breakers on the overhead circuit breaker panel, P11 and attach DO-NOT-CLOSE tags.
(a)
11H17, FLIGHT CONT SHUTOFF TAIL LEFT
(b)
11H18, FLIGHT CONT SHUTOFF TAIL CENTER
(c)
11H28, FLIGHT CONT SHUTOFF TAIL RIGHT
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A
757 MAINTENANCE MANUAL
C. Procedure
S 212-005
(1) Inspect the elevator and/or rudder components and their related support structure.
(a)
Examine the components that follow for damage you can see: 1) The PCA reaction links 2) The trunnions 3) The side links 4) The side link support brackets 5) The control rods 6) The pogo rods 7) The cranks 8) The crank support brackets.
(b)
Examine the control surface mast and hinge fittings, and adjacent structure for damage you can see.
(c)
Examine the two hinge ribs adjacent to the PCAs for damage you can see.
(d)
Examine the area of the left or right horizontal stabilizer and/or fin rear spar, as applicable. Look between the two hinge ribs adjacent to the PCAs for damage you can see.
S 342-006
(2)
Repair or replace areas that have bent, damaged, or cracked
components.
S 822-007
(3)
Adjust the elevator control system if it was found out of adjustment (Ref 27-31-00).
S 822-008
(4)
Adjust the rudder control system if it was found out of adjustment (Ref 27-21-00).
D. Put the Airplane Back to Its Initial Condition
S 862-009
(1) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the overhead panel, P11:
(a)
11H17, FLT CONT SHUTOFF TAIL LEFT
(b)
11H18, FLT CONT SHUTOFF TAIL CENTER
(c)
11H28, FLT CONT SHUTOFF TAIL RIGHT
S 862-010
(2)
Put the L, C, and R FLT CONTROL SHUTOFF switches in the ON position. The switches are found on the sidewall panel, P61.
S 862-011
(3)
Pressurize the left, center, and right hydraulic systems
(Ref 29-11-00).
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757 MAINTENANCE MANUAL
VOLCANIC ASH CONDITION (CONDITIONAL INSPECTION) - MAINTENANCE PRACTICES
_______________________________________________________________________
TASK 05-51-31-212-001
1. Volcanic Ash Conditional Inspection___________________________________
A. General
(1)
Flight crew reports of electrostatic discharge across the windshields are indications of a volcanic ash condition. Other indications are a bright glow in the engine inlets along with subsequent engine shutdown. Also, a possible limited view through the windshields and windows can occur.
(2)
Volcanic ash is a highly abrasive material that is usually found to be noncorrosive. But, because volcanic ash is very abrasive, finished surfaces open to volcanic ash can result in a corrosive condition.
(3)
The texture is almost the same as talcum powder. The dimensions of most ash particles are less than 5 microns with small amounts that are more than 50 microns. Volcanic ash is very abrasive so be careful when you wash the airplane. You can cause damage to the airplane if you rub the surface too hard.
(4)
Volcanic ash will stay on bare lubricated surfaces. It can go into many conventional seals, go into the engine gas path, or go into the air condition system. It is possible for the ash to go into other openings on the airplane. Bare lubricated surfaces that are known to be contaminated with volcanic ash must be cleaned and lubricated again. Do this as soon as possible to prevent unusual wear to the parts that move. Some of these parts are the inner cylinders of the landing gear shock strut, and hydraulic actuator rods. Also there are stabilizer trim and flap screw mechanisms. You must monitor parts that turn or slide for signs of ash related damage. This procedure must be done as a follow-on program if initial damage was not found.
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