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The T shaped end of the stud locates in a slot in the receptacle. When you turn the stud clockwise through 90° it engages the cam track in the receptacle and pulls the access panel into position. When the stud is turned fully 90° clockwise the T shaped end of the stud engages a small detent in the cam track. The compression spring in the stud assembly holds the stud in position in the detent.
There are different length studs. Short studs for thin panels and longer studs for thicker panels. Not all airplanes have the same length studs in the same position. This is because composite components can vary in thickness.
If you replace a fastener, make sure that the new fastener has the correct length stud.
Doc # 6.02.01 Page 1
Rev. 4 09 Jan 2003

51-40-00
Structures
AMM

Figure 1: Quick Release Fastener
51-40-00
Structures

Maintenance Practices
1. General
This Section tells you how to replace a quick release fastener stud in an access panel.
2. Replace a Quick Release Fastener Stud
A. Equipment
Item  Quantity  Part Number 
Stud Pliers.  1  Camloc 4 P 3 

B. Procedure
Detail Steps/Work Items  Key Items/References 
(1)  Remove the damaged stud assembly: S Turn the stud 90° counter-clockwise to release it from the receptacle. S Place the U jaw of the camloc pliers under the rim of the stud assembly. S Compress the stud assembly and remove it from the grommet.  If fitted. Refer to Figure 1. Turn the stud assembly approximately 30° off axis. 
(2)  Install the new stud assembly: S Select the correct length stud assembly. S Put the stud assembly into the U jaw of the camloc pliers. S Compress the stud assembly with the camloc pliers and install into the grommet. S Engage the stud in the receptacle and turn 90° clockwise to lock the stud.  Turn the stud assembly approximately 30° off axis. 

Doc # 6.02.01 Page 201
Rev. 4 09 Jan 2003

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Intentionally left blank
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Section 51-60
Control Surface Balancing

1. General
This Section tells you how to weigh and measure the residual moment of the control surfaces. Figure % 1 shows the Weights and Residual Moments Report with the Standard Tanks installed, Figure 2 shows % the Weights and Residual Moments Report with the optional Long Range Tanks installed (O.M % 40-071).
WARNING:  YOU MUST WEIGH AND BALANCE A CONTROL SURFACE AFTER ANY WORK WHICH COULD AFFECT ITS WEIGHT OR ITS BALANCE. OUT OF BALANCE CONTROL SURFACES CAN FLUTTER AND CAUSE STRUCTURAL FAILURE.
Correct control surface balance is critical to flight safety. You must remove a control surface to weigh and balance it after:
) Any repair to the control surface.
) Painting the control surface.
) Any report of control vibration or flutter in flight.
You can use any convenient method to weigh a control surface. If you use anything to connect the control surface to the weighing device, (for example, a sling) you must weigh it separately. Then subtract its weight from the total value. For example, you use a rope sling to lift an aileron with a spring balance:
) Weight of the aileron and the rope sling = 3.8 kg
) Weight of the rope sling  = 0.7 kg
) Weight of the aileron  = 3.8 kg - 0.7 kg = 3.1 kg
When you balance a control surface, the pivot angle of the control must be as shown in the Weights and Residual Moments Report.
We recommend that for balancing the flaps, aileron, elevator and elevator trim tab, you put a suitable size rod through the hinge bearings. Support the rod at 2 points to keep it horizontal.
To balance the rudder it must be supported at the top pivot pin and the bottom mounting bracket. The center line of the rudder must be horizontal.
　
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