5.  
Install the floor panel and seat belt attachments. Secure with screws and install seats.

RIGGING AND ADJUSTMENT OF WING FLAPS.
1.  
Place the flap handle in the full forward, flap retracted position.

2.  
If not previously accomplished, remove the floor panel just aft of the main spar.

3.  
If required, adjust the flap up stop and step lock, loosen the jam nut of the right torque tube stop screw. located in the floor opening along the outer end of the flap torque tube, and turn the stop screw to obtain approximately 0.60 of an inch between the stop fitting and the bearing block as measured along the top side of the screw.  (Refer to Figure 27-26.) It may be necessary to loosen the adjustment screw of the left stop.

4.  
Check cable tension and adjust if required to remove all slack. Do not tighten cable to the point that the stop screw comes off the stop.

27-50-00 Page 27-60 Issued: April 1, 1997

5.  
Place a 0.125 of an inch thick spacer between the right hand stop screw and stop fitting. With flaps installed and control rods connected. determine that, when down pressure is applied on top of the flap, it will not cause the flap to come down. If the flap extends (comes down under pressure), turn the stop screws out a few turns until the flap remains in the up-lock position with the spacer inserted. Adjust both stop screws, tighten jam nuts, and remove the spacer block.

6.  
To check the up-neutral position of the flaps place a flap rigging tool as shown in Figure 27-27 against the underside of the wing and flap as close as possible to the outboard end of the flap without contact-ing any rivets. ( Refer to Chapter 91 for dimensions to fabricate this tool.) The tool must be positioned parallel with the wing ribs. with the aft end of the tool even with the trailing edge of the flap.

7.  
With the flap control rods connected between the torque tube crank arm and flaps; check that the sur-face of the wing contacts the tool at its forward surface and at the spacer, and the aft end of the flap contacts the aft end of the tool. Maintain a light up pressure on the underside of the flap to remove slack in the linkage while making this check.

8.  
If required adjust each flap push rod so that the chord line of the flap forms a zero degree ± 1° angle with the wing chord at the outboard end of the flap. This is the neutral position.

— Note —
To remedy wing heaviness during flight, adjust the flap on the side of the heavy
wing down from neutral by lengthening the control rod. Check the inspection hole
in each rod end to ensure that there are sufficient threads remaining and a wire can-
not be inserted through the holes. Do not raise the flap of the other wing above
neutral.
27-50-00 Page 27-61 Issued: April 1, 1997
9.  
While maintaining a light up pressure on the underside of the flap, check flap down travel measuring from the neutral position obtained from Steps 6, 7 and 8. Flap deflection should be 10 ± 2 degrees at first notch, 25 ± 2 degrees at second notch, and 40 ± 2 degrees at the third notch.  Adjust the torque tube stop screw in or out as required. After any screw adjustment, it will be necessary to review Steps 3 thru 9.

10.
Check complete operation of the flaps, and handle and ratchet mechanism.  Install all access covers removed.

27-50-00 Page 27-62 Issued: April 1, 1997
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27-50-00 Page 27-63 Issued: April 1, 1997

C H A P T E R

F U E L

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CHAPTER 28 - FUEL
TABLE OF CONTENTS / EFFECTIVITY

CHAPTER/ GRID SECTION SUBJECT NO. EFFECTIVITY
28-00-00 GENERAL 2D22
Description 2D22 Troubleshooting 2D22
28-10-00 STORAGE 2E4
Fuel Cells 2E4 Removal of Fuel Cells 2E4 Installation of Fuel Cells 2E4 Cleaning and Inspection of Fuel Cells 2E4 Fuel Cell Compartment 2E6 Molded Nipple Fittings 2E6 Handling and Storage of Fuel Cells 2E6
Repair of Fuel Cells 2E7 Testing Fuel Cells 2E8
Locking Fuel Cap 2E9 Disassembly of Locking Fuel Cap 2E9 Assembly of Locking Fuel Cap 2E9
28-20-00 DISTRIBUTION 2E11
Fuel Filter 2E11 Removal of Fuel Filter 2E11 Cleaning of Fuel Filter 2E11 Reassembly of Fuel Filter 2E11
Fuel Selector Valve 2E12 Removal of Fuel Selector Valve 2E12 Disassembly of Selector Valve 2E13 Cleaning, Inspection and Repair of Selector Valve 2E13 Assembly of Selector Valve 2E14 Leak Test of Selector Valve 2E14
28-Cont./Effec. Page 28-3 Issued: April 1, 1997 28-Cont./Effec. Page 28-4 Issued: April 1, 1997
CHAPTER 28 - FUEL (cont) 
CHAPTER/ SECTION  TABLE OF CONTENTS / EFFECTIVITY GRID SUBJECT NO.  EFFECTIVITY 
　
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