27-51-73
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
BUSHING
BOLTS
B
SCREW
INBD B
BALL NUT
GIMBAL YOKE
FWD
FLAP CARRIAGE
EXAMPLE INBOARD FLAP GIMBAL
GIMBAL YOKE
1. BUSHING/BALL NUT (2 LOCATIONS)
NOTE: BALLSCREW AT THE NO. 3 TRANSMISSION IS SHOWN, BALLSCREW AT THE NO. 4, NO. 5, AND NO. 6 TRANSMISSIONS B-B ARE ALMOST THE SAME.
Flap Ballscrew Wear Limits
Figure 601 (Sheet 2)
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27-51-73
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
NO. INDEX PART NAME DIM. DESIGN LIMITS WEAR LIMITS WORN PART REPLACE PART WORN REPAIR INSTR. REPAIR
DIAMETER DIM. WEAR PERMITTED CLEAR-MAX DIA. ANCE
MIN MAX
1 BUSHING ID 0.7490 0.7500 0.7570 0.0094 1
BALLNUT OD 0.7476 0.7481 0.7476 X 2
2 FLANGED BUSHING ID 0.7490 0.7500 0.7570 0.0094 1
BALLNUT OD 0.7476 0.7481 0.7476 X 2
3 FLANGED BUSHING ID 0.7490 0.7500 0.7570 0.0099 1
GIMBAL OD 0.7476 0.7481 0.7471 X 2
43 BALLNUT ID
OD
REPLACE THE BUSHING WHEN THE ID IS MORE THAN 0.7570 INCH MEASURED ACROSS ANY DIAMETER.
VENDOR ITEM - REFER TO OVERHAUL MANUAL.
AIRPLANES WITH THOMSON SAGINAW OR BEAVER PRECISION BALLSCREWS;
0.0095-INCH MAXIMUM AXIAL BACKLASH BETWEEN THE BALLNUT AND THE
SCREW WITH A 50-POUND FORCE ON THE END.
AIRPLANES WITH UMBRA CUSCINETTI BALLSCREWS;
0.0057-INCH MAXIMUM AXIAL BACKLASH BETWEEN THE BALLNUT AND THE
SCREW WITH A 50-POUND FORCE ON THE END.
Flap Ballscrew Wear Limits
Figure 601 (Sheet 3)
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27-51-73
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
7) Make sure there is less than 0.0095 inches of axial backlash between the ballnut and the screw. a) If there is more than 0.0095 inches of axial backlash,
remove and replace the units that are not in tolerance.
(c)
Disconnect the ball nut from the gimbal
(d)
Do a check of the wear surfaces of the parts with a micrometer or vernier caliper as applicable (Fig. 601).
(e)
Compare the dimensions measured with the permitted dimensions shown in Fig. 601.
(f)
Repair or replace the parts that are not in the tolerance specified in Fig. 601.
(g)
Connect the ball nut to the gimbal
S 226-025
(3)
Disconnect the applicable universal joint between the ballscrew and the flap transmission (AMM 27-51-73/401).
(a)
Do a check of the wear surfaces of the parts with a micrometer or vernier caliper as applicable (Fig. 602 - Fig. 605).
(b)
Compare the dimensions measured with the permitted dimensions shown in Fig. 602 - Fig. 605.
(c)
Repair or replace the parts that are not in the tolerance specified in Fig. 602 - Fig. 605.
S 416-026
(4) Reconnect the applicable universal joint between the ballscrew and the flap transmission (AMM 27-51-73/401).
TASK 27-51-73-706-023
3. Flap Ballscrew Basklash Test (Fig. 606)
____________________________
A. Special Tools and Equipment
(1)
C27030-33 - Flap Ballscrew Backlash Tool
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 27-51-00/201, Trailing Edge Flaps
(3)
AMM 27-51-32/401, Inboard Flap Track Fairing
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