747-400 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(36)

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b) They are not plated at the assembly. c) Use a bolt with a silver plate to a thickness of 0.0003-0.0006 inch (0.0077-0.0152 mm).
 4)  These plated bolts have a diameter of 0.190 inch (4.826 mm), or they have a larger diameter. a) Decrease the pitch diameter, the maximum diameter, and
 the minimum diameter by 0.003 inch (0.076 mm) from the class 3A limits.
 b)  Bolts that have a diameter that is smaller than 0.190 inch (4.826 mm) must have the dimensions of the class 2A (Fig. 215, 216).
 5) These nuts use an unplated carbon or an alloy steel. a) Apply a cadmium plate to a thickness of 0.0002-0.0005 inch (0.0051-0.0127 mm). b) Use a bolt with a cadmium plate that has the dimensions of the Figure 215 and Figure 216.
 6)  Use a bolt with a cadmium plate to do a test on the unplated-aluminum nuts. a) The bolt must have the dimensions of the Figure 215 and
 Figure 216.
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 70-23-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FITTINGS - MAINTENANCE PRACTICES
________________________________
 1.  General_______
 A.  This task gives the steps to install flexible type fittings and
 positioning type fittings. No special steps are necessary for the
 removal of the fittings.

 TASK 70-24-01-402-001-N00
 2.  Flexible Type Fitting Installation (Fig. 201)__________________________________
 A.  Consumable Materials
 (1)  
D00390 Oil - Engine

 (2)  
D00250 Petrolatum White, VV-P-236 (optional to engine oil)

 B.  References
 (1)  AMM 70-23-00/201, Tightening Techniques and Torque Values
 C.  Access
 (1)  Location Zone
 412 Engine 1
 422 Engine 2
 432 Engine 3
 442 Engine 4

 D.  Procedure
 S 642-014-N00
 (1)  Lubricate the packing and the fitting threads with the engine oil or the white petrolatum.
 S 422-000-N00
 CAUTION:_______MAKE SURE YOU USE THE RETAINER. IF IT IS NOT USED, THE PACKING OR THE SEAL CAN COME OUT FROM BETWEEN THE TUBE AND THE CONNECTOR. THIS CAN CAUSE PIECES OF THE RUBBER TO GO INTO THE SYSTEM.
 (2)  
Assemble the flexible fittings for the oil and the fuel lines as shown in Fig. 201.

 S 212-004-N00

 (3)  
Make sure you correctly install the packing and align the tube before you tighten the fitting.

 (4)  
Tighten the fitting (AMM 70-23-00/201).

 S 432-005-N00
 TASK 70-24-01-402-006-N00
 3.  Positioning Type Fitting Installation (Fig. 202)_____________________________________
 A.  Consumable Materials
 (1)  D00250 Petrolatum White, VV-P-236
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 70-24-01
 ALL  ú ú N01 Page 201 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B. References
 (1)  
AMM 70-23-00/201, Tightening Techniques and Torque Values

 C.
Access

 (1)  
Location Zone
 412 Engine 1
 422 Engine 2
 432 Engine 3
 442 Engine 4

 D.
Procedure

 S 642-007-N00
 (1)  Lightly lubricate these items with the petrolatum or the fluid to be used in the line:
 (a)  
The packing

 (b)  
The retainer for the packing

 (c)  
The external threads of the fitting.

 S 422-013-N00
 (2)  Install the fitting:
 (a)  
Install the nut, the retainer for the packing, and the packing on the fitting as shown in Fig. 202.

 (b)  
Set the retainer for the packing in the counterbore of the nut.

TUBE NUT
AS SHOWN
PACKING
FERRULE
ASSEMBLY OF FLEXIBLE FITTING PACKING AND RETAINER L-71050
Flexible Fitting Installation Figure 201

E47343
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