E. Remove locknut and washer from each of three control unit mounting studs. Lower control unit and remove from airplane.
F. Reinstall cable guard, switch cover and lower pan on flap control unit.
5. Prepare Flap Control Unit for Installation
A. Remove lower pan.
B. Remove switch cover (Fig. 401).
C. Remove cable guard.
D. Coat exposed part of control unit input shaft and internal splines of input crank with corrosion preventive compound.
6. Install Flap Control Unit
A. Apply a brush coat of pressure sealant to wheel well ceiling around each flap control unit mounting stud (Fig. 401).
B. Install rigging pin F-1 in flap control unit.
C. Align blind splines and position flap control unit on mounting studs with control quadrant shaft end engaging control unit input crank. Install locknut and washer on each outboard mounting stud.
NOTE: Manually moving trailing edge flap control valve slide will aid aligning splines.
D. Secure control unit at inboard mounting stud, as follows:
(1)
Remove finish on lower surface of mounting lug.
(2)
Position washer and bonding jumper on mounting stud, then secure with washer and locknut.
(3)
Check electrical bond between flap control unit and structure per 20-22-01. Maximum resistance should not exceed 0.0025 ohm.
(4)
Apply one coat of primer to exposed areas where finish was removed.
E. Tighten clamping bolt in flap control unit input crank.
F. Remove caps from control valves and plugs from hydraulic lines. Connect hydraulic lines to valve ports.
27-51-201 Jun 20/84 Page 402
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G24285 G24370
543 Flap Control Unit Installation
Feb 01/74 Figure 401 (Sheet 1) 27-51-201
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Flap Control Unit Installation 500-
27-51-201 Figure 401 (Sheet 2) Feb 15/73
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G. Connect WFFA and WFFB cables to control unit follow-up drum. Wrap approximately 2-1/2 turns of WFFB cable on follow-up drum and approximately 1-1/2 turns of WFFA cable on follow-up drum. Tighten turnbuckles enough to remove cable slack.
NOTE: At flap power unit, WFFA cable will have approximately 2-1/4 turns and WFFB cable will have approximately 1/3 turn on follow-up drum.
H. Remove rigging pin F-1.
I. Install cable guard.
J. Use wrench set to install limit switches, as follows:
(1)
Remove finish at spot faced switch mounting areas on flap control unit.
(2)
Position one retaining nut on switch.
(3)
Install switch in flap control unit with retaining nut and roller guide. Install pin in roller guide and tighten retaining nut. Ensure that each switch is installed in proper position noted during control unit removal.
(4)
Check electrical bond between each switch and flap control unit per 20-22-01. Maximum resistance should not exceed 0.0025 ohm.
(5)
Apply one coat of primer to exposed area s where finish was removed.
(6)
Lockwire retaining nuts.
K. Adjust and test flap control unit (Ref Flap Control Unit - A/T).
L. Coat surface of gasket with light film of grease and install switch cover.
M. Coat surface of gasket with light film of grease and install lower pan.
536
Jun 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-201 Page 405
FLAP CONTROL UNIT - ADJUSTMENT/TEST
1. Flap Control Unit Adjustment
A. Equipment and Materials
(1)
Rigging Pin - F-1, 0.311 +0.000/-0.002 inch diameter, 2.35 +0.06 inches long (MS20392-4)
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