(b)
Slide sleeves off couplings to disconnect torque tubes.
D. Check minimum lockout torque.
(1)
Attach right angle gearbox torque wrench adapter to the input coupling of the right angle gearbox.
(2)
Attach torque wrench to adapter and apply a gradually increasing torque to the coupling until 180 pound-inches is reached.
NOTE: This may require up to 3/4 of a turn of the input coupling.
(3)
Note torque reading on torque wrench attached to universal joint when 180 pound-inches is reached on torque wrench attached to right angle gearbox. This torque reading is the minimum lockout torque and must be equal to or greater than the values in Fig. 602.
NOTE: Torque brake check should be made in same direction as flaps were moving when lockout was reported.
(4)
Repeat steps C and D for all transmissions to be checked.
E. Restore airplane to normal.
(1)
Remove torque wrenches and adapters.
(2)
Position jackscrew yoke in transmission universal joint. Instal1 bolt with corrosion preventive compound and tighten nut to 270-300 pound-inches.
(3)
Lubricate splined couplings with grease, engage torque tube sleeves with spline couplings on right angle gearbox and installing retaining screws. Lockwire heads together.
501
27-51-281 Page 604 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 1/74
G53151
500 Torque Brake Minimum Lockout Torques
May 15/71 Figure 602 27-51-281
Page 605
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
2. Wear Limits
A. General
(1) This data consists of illustrations and wear limits charts. There will be no procedure given in this section for gaining access to, or removing and replacing the component after inspection for wear. Refer to Component - Removal/Installation for this information.
B. Flap Transmission Wear Limits (Fig. 603)
G26223G26235
Flap Transmission Wear Limits 501
27-51-281 Figure 603 (Sheet 1) Feb 01/75
Page 606
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
501 Flap Transmission Wear Limits
Feb 01/75 Figure 603 (Sheet 2) 27-51-281
Page 607
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FLAP LIMIT SWITCHES -REMOVAL/INSTALLATION
1. General
A. Six switches are installed on the flap control unit. The flaps up switch and the flaps down switch are mounted on the forward portion of the unit housing (Fig. 401). The remaining four switches are covered as follows: (Ref 31-26-23, Flap Takeoff Warning Switch; 31-26-12, Flap Landing Warning Switch; 22-21-31, Mach Trim Flap Switch; 27-88-21, Flaps 10-Degree Switch).
NOTE: The switch leads for all but the Flaps 10-degree switch make a single wire bundle; and must be separated during switch removal and retied when a new switch is installed.
2. Equipment and Materials
A. Grease - MIL-G-23827 (Ref 20-30-21)
3. Remove Flap Limit Switch
A. Remove number 4 and 5 inboard flap track fairing (Ref 27-51-141 R/I).
NOTE: Fairing removal is required for access to measure ball screw nut location for switch adjustment.
B. Remove switch cover from flap control unit (Fig. 401).
C. Separate wire bundle connector from receptacle.
D. Remove two wire bundle support clamps.
E. Cut wire bundle ties and separate limit switch leads from remainder of bundle.
F. Remove limit switch leads from connector.
G. Extract pin to release roller guide.
H. Remove retaining nut from limit switch and remove switch from control unit.
I. Replace nut, roller guide, and pin on switch.
4. Install Flap Limit Switch
A. Remove pin, roller guide, and one retaining nut from switch (Fig. 401).
B. Position switch in flap control unit and install retaining nut and roller guide. Install pin to secure roller guide.
C. Install switch leads in connector and connect to receptacle.
D. Replace wire bundle ties.
E. Install two wire bundle support clamps.
531
Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-291 Page 401
F. Adjust limit switch (Ref Flap Limit Switches - Adjustment/Test).
G. Ensure that switch retaining nuts are lockwired.
H. Coat surface of gasket with light film of grease and install switch cover on flap control unit.
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