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D. Remove plugs from hydraulic lines and caps from hydraulic motor ports.
E. Connect hydraulic lines to hydraulic motor.
F. Check that rigging pin F-1 is installed in flap control unit (Fig. 402).
G. Connect WFFA and WFFB cables to power unit follow-up drum on aft side of power unit. Pay particular attention to cable routing as shown in Fig. 401 to avoid incorrect routing. Wrap approximately 2-1/4 turns of WFFA cable on follow-up drum and approximately 1/3 turn of WFFB cable on follow-up drum.
NOTE: At flap control unit WFFA, cable will have approximately 1-1/2 turns and WFFB cable will have approximately 2-1/2 turns on follow-up drum.
H. Adjust turnbuckles to tension cables as shown in following table. When cables are tensioned, ensure that rigging pin fits freely in control unit. Install locking clips on turnbuckles.
TEMPERATURE (°F) CABLE RIGGING LOAD (+20/-0 POUNDS) *[1]
110 90 70 50 30 10 -10 -30 -40 71 65 60 55 49 44 38 33 30
*[1] For required periodic checks without system discrepancy reports, the cable tensions may deviate +20/-20 pounds from Table values. For cable tension checks resulting from system discrepancy reports, the tensions may deviate +20/-0 pounds from Table values. Whenever cables are readjusted, Table values must be met.
NOTE: Allow a minimum of 1 hour at constant ambient temperature (+ 5°F) for airframe temperature to stabilize.
I. Rotate torque tubes which connect to power unit until angular clearance between upstops on flap transmissions are 170 to 190 degrees (1/2 turn +10 degrees) turn from contact (Fig. 403).
CAUTION: MAXIMUM ALLOWABLE ANGULAR CLEARANCE IS 1/4 TO 5/6 TURN. A VALUE FOR (XL) OUTSIDE THIS RANGE MAY CAUSE DAMAGE DURING FLAP OPERATION. PREVIOUS LATERAL TRIM CORRECTIONS SHOULD BE RETAINED.
J. Lubricate torque tube sleeves with grease and connect to power unit spline couplings. Install retaining screws and lockwire.
K. Remove rigging pin F-1 from flap control unit (Fig. 402).
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G25821
Flap Transmission Upstop Clearance
535 Figure 403
May 15/72 27-51-222
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L. On circuit breaker panel P6 , close TE ALT FLAP DRIVE MOTOR circuit breaker.
M. Test flap power unit (Ref 27-51-221, Adjustment/Test).
N. Check hydraulic reservoir and service if required (Ref Chapter 12, Hydraulic Servicing).
O. Install inboard flap track fairings (Ref 27-51-141, Inboard Flap Track Fairings).
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FLAP HYDRAULIC MOTOR - REMOVAL/INSTALLATION
Equipment and Materials
A. Fire Resistant Hydraulic Fluid - BMS 3-11
B. Skydrol Assembly Lube - MCS 352
C. Grease - MIL-G-23827
2. Remove Flap Hydraulic Motor
A. Remove system A hydraulic power and depressurize hydraulic reservoir A. Refer to 27-51-0, Trailing Edge Flaps - Maintenance Practices.
B. Disconnect hydraulic lines from hydraulic motor. (See figure 401.)
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