(2)
Attach dial indicator to left side of fuselage at body station 1154, so that plunger on indicator is depressed at least 1/8 inch and is touching stabilizer lower surface (Fig. 601).
NOTE: Any suitable method for attaching dial indicator may be used.
(3)
Let two persons apply and remove their weight first on left stabilizer tip near front spar. Set dial indicator to zero. Then move the two persons to right stabilizer tip and record dial indicator reading. Remove weight of the two persons. Compute left hinge fitting free play as follows:
X = D . W
Where D = Dial Reading
W = 0.0000155 multiplied by the applied weight
(of the two persons)
NOTE: If the quantity is negative, X = 0.
(4)
Attach dial indicator to right side as in step (2). Set dial indicator to zero.
(5)
Apply weight of the two persons to left stabilizer tip near front spar. Record dial indicator reading. Remove weight of the two persons. Compute right hinge fitting free play as follows:
Y = D . W
Where D = Dial Reading
W = 0.0000155 multiplied by the applied weight
(of the two persons)
NOTE: If the quantity is negative, Y = 0.
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Dial Indicator Gage Locations 502
27-41-31 Figure 601 Aug 01/75
Page 602
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B. Determine stabilizer jackscrew joint free play (referred to in following as Z):
(1)
Check that stabilizer is at 3 units of trim and open stabilizer jackscrew compartment access door.
(2)
Position the two men on upper surface of stabilizer, adjacent to fuselage, aft of body station 1156, one man each on left and right stabilizer. Remove weight of the two men.
(3)
Attach dial indicator to body station 1088 bulkhead structure so that plunger is touching stabilizer center section front spar fitting lower surface and is depressed at least 1/8 inch (View 1, Fig. 601). Set indicator to zero.
NOTE: Any suitable method for attaching dial indicator may be used.
(4)
Position the two men on upper surface of left and right stabilizer adjacent to fuselage along stabilizer front spar.
(5)
Record reading on dial indicator. Remove weight of the two men. Compute jackscrew free play as follows:
Z = (D multiplied by 1.25) – (Wt multiplied by 1.25)
Where D = Dial Reading
W = 0.0000255 multiplied by the applied weight
(of the two persons)
NOTE: If the quantity is negative, Z = 0.
C. Determine total stabilizer free play (referred to in following as H):
(1) Apply values X, Y, and Z from steps A and B to following equation:
X +Y
H = _ ________
+ Z
2
D. Determine if replacement of stabilizer center section hinge fitting and/or disassembly of jackscrew is required.
(1)
If value X exceeds 0.060 inch, replace left hinge bearing.
(2)
If value Y exceeds 0.060 inch, replace right hinge bearing.
(3)
If value Z exceeds 0.05 inch, disassemble jackscrew (AMM 27-41-81/401) and repair as required.
(4)
In addition, if value H is greater than 0.0505 inch, replace stabilizer center section hinge fitting (AMM 27-41-31/401) and/or disassemble jackscrew (AMM 27-41-81/401) and repair as required, because total combined free play allowed has been exceeded.
E. Remove weights (if used), dial indicator, and equipment for attaching dial indicator.
F. Close stabilizer jackscrew compartment access door.
501
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HORIZONTAL STABILIZER CENTER SECTION HINGE FITTING - APPROVED REPAIRS
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