NOTE: If there is damage to the valve, the valve must be
____
 replaced.

 (a)  Look for:
 -missing parts
 -cracks
 -corrosion
 -flapper deformation
 -restricted flapper movement.
 S 422-004
 (3)
Install the cabin air supply check valve (AMM 21-51-15/401).

 (4)  
Put the airplane back to its usual condition.

 S 842-005
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A

757 MAINTENANCE MANUAL
 EXTREME DUST CONDITION - MAINTENANCE PRACTICES
______________________________________________
 1.  General_______
 A.  This section gives procedures to examine the dust sensitive areas on the airplane when there are extreme dust conditions.
 TASK 05-51-27-212-001
 2.  Extreme Dust Conditional Inspection___________________________________
 A.  Procedure
 S 212-002
 (1)  Make sure the areas that follow are clean:
 (a)  
Stabilizer trim and flap screw mechanisms.

 (b)  
Static ports and pitot tubes.

 (c)  
Landing gear shock strut inner cylinders and all gear actuator pushrods. This includes the main gear uplock actuator pushrods.

 (d)  
Engine inlet and indicator probes.

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 05-51-27
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A

757 MAINTENANCE MANUAL
 ICE OR SNOW CONDITION - MAINTENANCE PRACTICES
_____________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A.  This section gives procedures to examine the airplane surface before a flight when there are ice or snow conditions.
 TASK 05-51-28-212-001
 2.  Ice or Snow Conditional Inspection__________________________________
 A.  References
 (1)  12-33-01/301, Cold Weather Maintenance
 B.  Procedure
 S 212-002
 (1)  When there are ice or snow conditions, examine the areas that follow before the airplane flight.
 (a)  
Look at the fuselage, wings, control surfaces, movable seals and hinge points for ice or snow.

 (b)  
Look at the engine inlet cowl for ice and snow. Also make sure the and the first stage compressor turns freely.

 S 662-003
 (2)  If there is ice or snow, do the cold weather maintenance service (Ref 12-33-01).
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757 MAINTENANCE MANUAL
 EXCEEDING MAXIMUM NOSE LANDING GEAR TOWING ANGLE OR MAXIMUM TOWING LOAD
_______________________________________________________________________ (CONDITIONAL INSPECTION) - MAINTENANCE PRACTICES
________________________________________________
 1.  General
_______
 A.  The following procedure is required for an accidental turn of the nose landing gear greater than the maximum steering angle with torsion links attached, applying without deactivating the steering system, or towing more than the maximum towing loads.
 NOTE: Exceeding maximum steering angle with torsion links attached is
____
 also known as an oversteer.

 B.  This inspection procedure is divided into two phases (Phase I and Phase II).
 (1)  
If the inspection during Phase I does not shown that damage has occurred, no more inspections are necessary.

 (2)  
If the Phase I inspection shows that damage has occurred, the Phase II inspection must be done.
　
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