Reverse Thrust Lever Clearance Measurement
Figure 505
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CFM56 ENGINES
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NOTE: A DONWARD FORCE OF 6 LB. |2LB., APPLIED AT 90` TO THE START LEVER, IS NEEDED TO START MOVING THE LUG AWAY FROM THE DETENT FACE. THE LUG ONLY NEEDS TO MOVE ENOUGH TO SEE A SLIGHT GAP.
Start Lever Tension Figure 506
H49863
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CFM56 ENGINES
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F. Adjust the Tension of the Thrust Control Cables (Fig. 504). NOTE: The forward loop extends from the control stand to the
____
autothrottle servomechanism.
NOTE: The aft loop extends from the servomechanism to the quadrant at
____
the strut drum control box.
NOTE: Turnbuckles for the forward loop are located forward of the
____
autothrottle mechanisms.
NOTE: Turnbuckles for the aft loop are located in the wing leading
____ edge before SB 76-1023. The turnbuckles are in the fuselage after SB 76-1023.
NOTE: These are the tension cables T1A/T1B/T2A/T2B.
____ S 845-128-C00
(1)
Do the procedure: Prepare for the Adjustment.
S 015-129-C00
(2)
Remove the access panel No. 6301 (left wing) or No. 6401 (right wing) from the upper aft surface of the nacelle strut (AMM 12-31-71/201).
S 015-130-C00
(3)
Open the access door to the electronic equipment bay No. 1201 (AMM 12-31-11/201).
S 865-132-C00
(4)
Extend the forward airstairs (AMM 52-61-00/001).
S 865-133-C00
(5)
Make sure that the forward thrust lever is at the idle position. NOTE: Put a a warning sign in the flight compartment to tell
____ personel not to operate the engine controls.
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(6) S 865-175-C00Measure the distance between the center of the thrust reverser knob and the highest point on the throttle lever casing as shown in (Fig. 505).
(7) S 865-176-C00If this distance is less than 1.75 inches indicating excessive reverse thrust handle wear refer to 'applicable' CMM procedure for mechanism replacement.
(8) S 495-134-C00Install the rig pin 1 (F70207-23) in the torque switch mechanism of the autothrottle (View B, Fig. 504).
(9) S 495-135-C00Install the rig pin 2 (F70207-8) through the IDLE hole in the strut drum control box (View A, Fig. 504) and into the throttle gearshaft.
S 865-136-C00
(10) If a thrust control cable or cables have been replaced, do these steps:
(a) Adjust the cable tension to approximately 125 pounds (56.8 kilograms).
NOTE: Use a tensiometer to measure the cable tension.
____
(b)
Remove the rig pins.
(c)
Move the thrust lever 25 times between the idle and the full forward positions.
S 835-137-C00
(11) Adjust the cable tension to the applicable ambient temperature (Table 501).
NOTE: Uniform takeup in A and B cables increases the cable tension.
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