747-400 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(14)

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 NOTE: These thrust wires have a lockwire hole through
____ their head. Use the end of the lockwire from the torqued nut to safety the thrust wire in position.
 4) For plain thrust wire, assemble the thrust wire flush or below the outside surface of the tube nut. 5) The installation is complete and correct if the thrust wire holds the nut on the tube and the nut turns smoothly. 6) Remove the covers from the openings and make sure that the tube has no damage or internal blockage.
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HARDWARE MATERIAL IDENTIFICATION - MAINTENANCE PRACTICES
________________________________________________________
 1.  General
_______
 A.  These engines use a permanent type of material code identification.
 B.  During an engine assembly, you must monitor the material specifications for the nuts and bolts used in the hot section of the engine.
 C.  In the hot section, use only heat-resistant alloys.
 D.  You must install the correctly identified parts that are serviceable in their correct locations.
 TASK 70-20-03-902-001-N00
 2.  Identification of Hardware Material
___________________________________
 A.  Material Code Identification
 S 912-002-N00
 CAUTION: USE THE PARTS THAT HAVE NO IDENTIFICATION (OR THAT HAVE ONLY
_______ THE MANUFACTURER'S IDENTIFICATION) ONLY IN THE LOW TEMPERATURE AREAS OF THE ENGINES. REFER TO THE P&W MANUAL FOR THE PART NUMBERS AND MANUFACTURER'S CODE IDENTIFICATION.
 (1)  The letter code (Prefix)
 (a)  
The letter C identifies corrosion resistant steel.

 (b)  
The letter H identifies the heat-resistant alloys that you must use in the hot section.

 (c)  
The letter T identifies titanium alloys.

 (d)  
The letter S identifies common temperature range alloys.

 NOTE: The letter S replaces E for common temperature range
____
 materials.

 S 912-003-N00
 (2)  An E comes before the code identification, when the part is a standard AN, MS, or AS part (with a 6 number part number).
 NOTE: Pratt & Whitney does not make parts with the letter E.
____
 S 912-004-N00
 (3)  The number code (Suffix)
 (a)  A number follows this letter code (examples: C1, and H17).
 S 912-005-N00
 (4)  The location of the material code identification follows (Fig. 201):
 (a)  On bolts, look on the top of the head.
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(b)  On nuts, look on one side of the nut.
 S 912-006-N00
 (5)  New code identification
 (a)  
The new identification numbers are added to this table.

 (b)  
The letter B or P gives a temporary P&W identification until a S, C, H, or T number shows.

 S 912-007-N00
 CAUTION: DO NOT ASSEMBLE A PART WITH THE IDENTIFICATION C IN A LOCATION
_______ FOR A PART WITH THE IDENTIFICATION H. ALSO PREVENT THE OPPOSITE PROCEDURE. DO NOT USE NUTS, BOLTS OR OTHER PARTS WITH CADMIUM PLATE IN THE HOT SECTION OF THE ENGINE. DO NOT USE THESE PARTS WITH TITANIUM PARTS. THIS WILL PREVENT DAMAGE TO THE ENGINE.
 (6)  This procedure prevents the assembly of incorrect parts.

BOLT CODE IDENTIFICATION  NUT CODE IDENTIFICATION

Bolt and Nut Code Identification
Figure 201

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(7)  S 912-008-N00During the removal, put together all parts that have the same code letters to prevent a mixture of parts.
　
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