(2)
If it is necessary to use an adapter on the torque wrench, refer to Fig. 201 to find a corrected torque wrench value. Follow the examples in Fig. 201 to find the corrected torque wrench value T1 when you use an adapter (length B).
(3)
Refer to Fig. 203 for the minimum permitted torque value for self-locking nuts. If you think a self-locking nut turns too easily or turns too hard on the bolt, refer to Fig. 203 for a test of the nut.
TASK 20-51-01-912-008
2. Torque Values______________
A. Procedure
S 912-002
(1)
Torque values are given in Fig. 204 for Reduced Head Bolts.
S 912-003
(2)
Torque values are given in Fig. 205 for Rigid Tube Coupling Connectors.
(3)
Torque values are given in Fig. 206 for Pipe Thread Fittings.
S 912-005
(4)
Torque values are given in Fig. 207 for Low Pressure and Return Line Fittings.
S 912-006
(5)
Torque values are given in Fig. 208 for Flareless Tubing Fittings with lubricated threads.
S 912-007
(6)
Torque values are given in Fig. 209 for Channel Band Clamps, Duct Support Clamps, Hose Clamps, and V-Band Clamps.
S 912-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
TA
T1 = A+B
A = TORQUE LENGTH OF TORQUE WRENCH B = TORQUE LENGTH OF ADAPTER T = ACTUAL TORQUE OF NUT T= TORQUE OF WRENCH SHOWN
1
(CORRECTED TORQUE)
EXAMPLE A = 12 INCHES B = 3 INCHES T = 160 POUND-INCHES
160 x 12T =
1
12+3
T = 128 POUND-INCHES
1
METHOD I
Torque Wrench Adapter
Figure 201 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
HANDLE EXTENSION ONLY. NO CORRECTION NECESSARY.
METHOD II
ADAPTER WITH THE EXTENSION BETWEEN THE
ADAPTER AND THE WRENCH. BOTH ARE IN LINE WITH THE WRENCH. INDICATED TORQUE T:
1
TA
T =
1
A+B
METHOD III
BOTH HANDLE EXTENSION AND ADAPTER, INDICATED TORQUE T :
METHOD IV
NOTE:____IF POSSIBLE, METHODS V AND VI SHOULD NOT BE USED. WHEN IT IS NECESSARY TO USE THESE METHODS, THE FOLLOWING CONDITIONS MUST BE APPLICABLE:
1.
THE ADAPTER PLUS ANY EXTENSIONS USED BETWEEN THE WRENCH AND THE ADAPTER MUST NOT BE MORE THAN THE LENGTH OF THE WRENCH.
2.
WHEN A FORCE IS APPLIED AT 90 |3 DEGREES TO THE HANDLE OF THE WRENCH, IT IS RECOMMENDED THAT A STIRRUP-TYPE HANDLE WITH A POINTER (INDICATING ANGLE OF LOADING) BE USED TO MAKE SURE LOADING IS AT THE CORRECT ANGLE.
90`. INDICATED TORQUE T :
1
ADAPTER AT RIGHT ANGLE TO THE
TA
1T = A+B WRENCH. NO CORRECTION NECESSARY.
METHOD V METHOD VI
Torque Wrench Adapter
Figure 201 (Sheet 2)
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NUT TIGHTENING TORQUE 1
NUT PART NUMBERAND STYLE (12-POINT), N10HC (BARREL NUT)N10HR (12-POINT), N10JG N10JA (PLATE-NUT), N10B (12-POINT), N10JBTHRU 1-1/4 ONLY)(PLATE-NUT), N10RM (PLATE-NUT), NAS577 (BARREL-NAS1804-1805 (12-POINT), N10GW (12-POINT),NUT), N10JD (CASTELLATED NUT THICK STYLE 7/164 N10JC (SHEET METAL HEX-SIZES #4 THRU 7/16 ONLY),ALL PLATE-NUTS EXCEPT N10JA, N10JB, AND N10RM,ALL CLIP-NUTS, INSERTS, AND TAPPED HOLES,MS21042 HEX, MS21043, N10JD (CASTELLATED-THICK(CASTELLATED-THICK STYLE)STYLE ALL SIZES 3/16 THRU 1-1/4), MS141444 N10JD, MS14145(CASTELLATED-THIN STYLEALL SIZES -103 THRU -120)MS21245 (HEX SIZES 1/2 THRU 1-1/2)4AN316, AN316C, (JAM NUTS), N10JC, NYLON NUTBACN10YJ
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