S 865-050
(8)
Supply the system B hydraulic power (AMM 27-51-00/201).
S 865-051
(9)
Move the flap control lever to the UP detent to retract the flaps.
(a)
Stop for 2 minutes to permit the flaps to fully retract.
S 865-052
(10)
Remove the system B hydraulic power (AMM 27-51-00/201).
S 715-053
(11)
Do the test of the flap asymmetry circuit.
(a)
Put the asymmetry test switch in the L position (Fig. 507). 1) Make sure the asymmetry test light is on. 2) Make sure the left pointer on the flap position indicator
moves 22 |5 degrees (a chordal dimension of 0.17 to 0.28 inch between the two pointers). 3) Make sure the flap bypass valve moves to the position 2.
(b)
Release the asymmetry test switch. 1) Make sure the asymmetry test light is off. 2) Make sure the flap bypass valve moves to the position 1.
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3) Make sure the two pointers align.
(c)
Put the asymmetry test switch in the R position. 1) Make sure the asymmetry test light is on. 2) Make sure the right pointer on the flap position indicator
moves 22 |5 degrees (a chordal dimension of 0.17 to 0.28 inch between the two pointers). 3) Make sure the flap bypass valve moves to the position 2.
(d)
Release the asymmetry test switch. 1) Make sure the asymmetry test light is off. 2) Make sure the flap bypass valve moves to the position 1.
S 865-054
(12)
Make sure the flaps are in the fully retracted position.
S 225-055
(13)
At each flap transmission, measure the angular clearance between the upstops on the ballscrew nut and the ballscrew yoke (Fig. 505).
(a)
Make sure the clearance is 170 to 190 degrees (1/2 turn |10 degrees).
(b)
At the No. 4 transmission, measure and make a record of the dimension X. Refer to this as the dimension X1.
S 865-056
(14)
Supply the system B hydraulic power (AMM 27-51-00/201).
S 725-057
(15)
Do a test to make sure the flaps move to the correct position:
(a)
Move the flap control lever to the UP detent to retract the flaps.
(b)
Move the flap control lever to the 1-unit detent to extend the flaps. 1) Stop for 2 minutes to permit the flap movement to stop.
(c)
At the No. 4 transmission, measure the dimension X. Refer to this as the dimension X2.
(d)
Make a record of the dimension X2 in Table 501 (EXTEND column).
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737-300/400/500MAINTENANCE MANUAL
(e) Measure and make a record of the dimension X2 with the flap control lever in the 2, 5, 10, 15, 25, 30 and 40-unit detents.
~.............................................................................. | Table 501 | ................................................................................
| FLAP | NO. 4 FLAP BALLSCREW POSITIONS |
| CONTROL | -INCHES- |
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