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CAUTION: DO NOT EXCEED 65-POUND LOAD DURING TEST.
1)  Hold control columns fixed in neutral.
2)  Move right elevator by hand until trailing edge aligns with index mark on tail cone, then release (detail A, Fig. 505).
3)  If elevator trailing edge moves down from index, elevators are out of balance. Correct these conditions before proceeding. Refer to Chapter 51 of the Structural Repair Manual for balancing of elevators.
4)  If elevator trailing edge moves up from index, measure force required to restrain elevator at index position. Subtract this force from force required to move elevator trailing edge down 0.75 士0.15 inch from index mark. The difference of forces should not exceed 16 pounds.
5)  If elevator trailing edge remains aligned with index mark, measure force required to move elevator trailing edge up 0.75士0.15 inch. Measure force required to move elevator trailing edge down 0.75 士0.15 inch. If down force is less than up force, elevators are unbalanced. Correct these conditions before proceeding.
6)  If values determined in step 4) exceed 16 pounds, determine whether excessive friction is in elevator hinges or elevator power unit or both. Refer to 27-31-21, Test Elevator Hinges and 27-31-101, Test Elevator Power Control Unit.
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(2)  Test Elevator Limit Travel
(a)  
Remove elevator systems A and B hydraulic power (Ref 27-31-0 MP).

(b)  
Check that horizontal stabilizer B dimension is set at 41.57 士0.05 inches.

(c)  
Check that mach trim actuator is set in null position (Ref 27-31-0 MP).

(d)  
Measure elevator limits of travel in both directions. Use a loading block and apply force to elevator rear spar, between inboard rib and tab cutout.

CAUTION: DO NOT EXCEED 65-POUND LOAD DURING TEST.
NOTE: Use approximately a 10-pound force.
1)  Release control columns and allow them to move freely.
2)  Move left elevator down against stop. Check that elevator deflects 10.55  +0.60/-0.30 inches from index mark on tail cone.
3)  Move left elevator up against stop. Check that elevator deflects 14.60  +0.30/-0.55 inches from index mark on tail cone.
4)  Move right elevator down against stop. Check that elevator deflects 10.55 +0.60/-0.30 inches from index mark on tail cone.
5)  Move right elevator up against stop. Check that elevator deflects 14.60  +0.30/-0.55 inches from index mark on tail cone.
(3)  Check elevator output torque tube bus linkage.
(a)  
Check that system B hydraulic power is on and system A is off (Ref 27-31-0 MP).

(b)  
Apply a force of 15 士5 pounds to right elevator trailing edge in up direction and release slowly. Record elevator position after removing force.

(c)  
Perform step (b) in down direction and record position.

(d)  
Distance between right elevator up and down positions shall not exceed 0.160 inch.

(e)  
Turn off system B hydraulic power and turn on system A (Ref 27-31-0 MP).

(f)  
Apply a force of 15 士5 pounds to left elevator trailing edge in up direction and release slowly. Record elevator position after removing force.

(g)  
Perform step (f) in down direction and record position.

(h)  
Distance between left elevator up and down positions shall not exceed 0.160 inch (AMM 27-31-11/601, 27-31-191/601).

27-31-0  Aug 01/94
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(4)  Test Elevator Tab Linkage
NOTE: 1.  Make sure that control columns are not moved during this test and are in centered position.
2.  This test verifies the elevator tab control system integrity (components are correctly installed and operating correctly).
(a)  
Provide elevator systems A and B hydraulic power (Ref 27-31-0).

(b)  
Jiggle left tab up and down by hand to determine if tab is loose. Looseness shall not exceed 0.030-inch total movement at inboard trailing edge.

(c)  
Repeat step (b) for right tab.

(d)  
Turn off elevator hydraulic systems A and B.

(e)  
Check that stabilizer jackscrew B dimension is set at 41.57士0.05 inches.

(f)  
Set mach trim actuator in null position (Ref Elevator and Tab Control System MP).

(g)  
With elevators held at index within 0.04 inch, measure tab position.

(h)  
　
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