(f)  
Remove rigging pin F-1 and install lower pan on flap control unit.

(3)  
Adjust Leading Edge Flaps

(a)  
Provide system A hydraulic power (Ref 27-81-0 MP).

(b)  
Extend leading edge flaps by placing flap control lever in 1-unit detent.

(c)  
Depressurize hydraulic system A (Ref 27-81-0).

(d)  
Install locks on all flaps except flap being adjusted.

(e)  
Check that with flap extended, flap nose firmly contacts pads on flap panel (Section B-B, Fig. 502). Adjust as follows: 1) Check that center-to-center lengths of flap nose links are as shown in section B-

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B. Disconnect links from operating cranks and adjust as required. Tighten and lockwire adjustment nuts. Connect links to cranks and tighten nuts to 5-10 pound-inches. Install cotter pins.
2)  Disconnect flap nose rods from operating cranks and adjust to obtain flap nose to pad contact. Tighten and lockwire adjustment nuts. Connect rods to cranks and tighten nuts to 5-10 pound-inches. Install cotter pins.
(f)  Disconnect actuator from flap panel and restrain up out of the way. Manually retract flap and check that flap nose clears structure and equipment as flap retracts. If inboard flap is being checked, check that inboard flap nose clears fuel boost pump, upstop and inner surface of flap panel (section A-A). Adjust as follows:
NOTE:  To check clearances at inboard flap nose, apply modeling clay to flap nose and check impressions to determine clearances.
1)  Lengthen flap nose link for increased clearance between flap nose and fuel boost pump.
NOTE:  With flap nose red disconnected and flap nose folded back, clearance between flap nose and operating crank should be 0.01 + 0.01 inch.
2)  Follow adjustment of link with flap nose rod to ensure flap nose will contact flap pads on extension and to ensure flap nose will clear fuel boost pump on retraction.
NOTE:  If adjustment of flap nose link and flap nose rod will not provide proper clearance between flap nose and fuel boost pump, rework and adjust linkage per SB 57-1135.
3)  Extend flap and temporarily connect actuator to flap. Check that flap nose contacts pads on flap panel. Adjust links and rods to obtain required structural clearance and flap pad contact.
4)  Tighten and lockwire adjustment nuts. Connect links and rods to operating cranks. Tighten nuts to 5-10 pound-inches and install cotter pins.
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5)  Remove bolt and restrain actuator up out of the way.
(g)  
Retract flap panel and check that seal depressor on flap contacts full length of bulb seal in wing. Extend flap slightly and check that depressor clears structure by at least

0.08 inch on opening. Adjust seal depressor position if required(Detail A, Fig. 503).

(h)  
Extend flap panel and connect actuator to flap. Tighten nut to 660-780 pound-inches and install cotter pin.

(i)  
Remove safety locks from all leading edge flaps.

(j)  
Provide system A hydraulic power(Ref 27-81-0).

(k)  
Retract leading edge flaps. Check that flap nose clears structure and equipment on retraction. Readjust per step(f) if required.

CAUTION:  CLEARANCE MUST BE VERIFIED TO ENSURE PROPER FLAP OPERATION AND TO PREVENT ANY STRUCTURAL DAMAGE.
(l) Check gaps and mismatch with flaps retracted: 1) Check gap and mismatch at trailing edge of flap panel and mismatch at leading edge(Fig. 503). 2) Check that metal-to-metal gap between ends of inboard and outboard flap panels is 0.06 to 0.15 inch all along except aft 5 inches where gap is to be 0.06 to 0.25 inch.
3)  If gaps and mismatch are not correct, check wing and flap panel for damage or warpage.
NOTE:  The above checks are made to ensure correct flap and wing alignment. No adjustments can be made.
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G41915
531  Leading Edge Flap Gap and Mismatch Requirements 
Feb 15/73  Figure 503  27-81-0 
Page 511 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(4)  Adjust Leading Edge Slats
(a)  
Provide system A hydraulic power. Refer to 27-81-0.
　
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