CAUTION: DO NOT INSTALL RIGGING PIN F-1 WITH HYDRAULIC POWER ON.
NOTE: If rigging pin slot in follow-up cam must be rotated downward, cam link must be shortened. This is accomplished by rotating sleeve clockwise.
5) Position flap control lever in 5-unit detent to extend flaps, then set lever in FLAP
UP detent.
6) After 2-minute wait, remove system A hydraulic power (Ref 27-51-0).
7) Check that rigging pin F-1 fits freely. If not, repeat step 2) thru 6).
8) Tighten checknuts and install lockwire, two places.
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9) Ensure that thread engagement of rod end sleeve is within limits as shown in detail B.
(j)
Remove rigging pin F-1.
(k)
Provide system A hydraulic power (Ref 27-51-0).
(l)
Operate flap control system by moving flap control lever from FLAP UP and FLAP DOWN (40-unit) position and back to UP. Pause at UP and DOWN (40-unit) positions to allow flap drive unit to respond. Repeat for five cycles.
(m)
Position flap control lever in FLAP UP detent. After waiting 2 minutes, remove system A hydraulic power (Ref 27-51-0).
(n)
Check that rigging pin F-1 fits freely in flap control unit. If rigging pin does not fit freely, repeat steps (i) thru (n).
(o)
Install lower pan on flap control unit.
(3)
Use wrench set to adjust switches (Ref 27-51-291, Flap Limit Switches; 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).
(4)
Coat surface of gasket with light film of grease and install limit switch cover. Test flap control unit.
2. Flap Control Unit Test
A. Test Flap Control Unit
(1) Test trailing edge flap indexing.
(a)
Provide system A hydraulic power (Ref 27-51-0).
(b)
Place flap control lever in FLAP UP detent and retract flaps.
(c)
After waiting 5 minutes, remove system A hydraulic power (Ref 27-51-0).
(d)
Check that angular clearance between upstop on ball screw nut and upstop on each jackscrew yoke is 170 to 190 degrees (1/2 turn ± 10 degrees) turn (1/4 to 5/6 [90-300 degrees] turn if lateral trim correction has been made)(Fig. 503).
CAUTION: MAXIMUM ALLOWABLE ANGULAR CLEARANCE IS 1/4 TO 5/6 (90-300 DEGREES) TURN. A VALUE FOR (X1) OUTSIDE THIS RANGE MAY CAUSE DAMAGE DURING FLAP OPERATION. PREVIOUS LATERAL TRIM CORRECTIONS SHOULD BE RETAINED.
(e)
At number 4 jackscrews, measure dimension X1 as shown in detail A. Record value.
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G24383
Flap Transmission Upstop Clearance 500
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(2)
Test trailing edge flap positioning.
(a)
Provide system A hydraulic power (Ref 27-51-0).
(b)
Position flap control lever in 1-unit detent to extend trailing edge flaps.
(c)
Wait 2 minutes, then measure X2 dimension at number 4 jackscrew. Record value in table below.
(d)
Repeat step (c) with flap control lever in 2-, 5-, 15-, 25-, 30- and 40-unit detents.
(e)
Repeat step (c) with flap control in 30-, 25-, 15-, 10-, 5-, 2- and 1-unit detents (flaps retracting).
(f)
Using X1 dimension, from step (1)(e), perform necessary subtraction to obtain X2 - X1 dimensions. These dimensions must be within required tolerances for flaps extending and flaps retracting.
(3)
Check normal trailing edge flap operating time.
FLAP CONTROL LEVER POSITION -UNITS- NO. 4 FLAP JACKSCREW POSITION -INCHES-
REQUIRED X2 - 1X ACTUAL X2 EXTEND ACTUAL X2 - X1 EXTEND ACTUAL X2 RETRACT ACTUAL X2 - X1 RETRACT
1 3.90 TO 5.00
2 13.45 TO 14.80
5 17.84 TO 19.34
10 22.49 TO 23.15
15 24.11 TO 24.81
25 25.26 TO 25.94
30 27.12 TO 27.78
40 29.82 TO 30.48
NOTE: Hydraulic service cart set at 20 gpm and 3000 psi or operation of at least one engine-driven pump is required to perform this portion of test.
G53127
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