(4)
 Install the PITCH TRIM CONTROL LOCKING (98D27403500000) which locks the pitch-trim control-wheels.

 (5)
 Make sure that the THS graduation agrees with the zero on the fuselage.

 (6)
 Make sure that :

 -you can install and remove the PIN - RIGGING (0U190360) (10) easily on the input shaft of the THS actuator. (Ref. Fig. 501/TASK 27-41-00-991-001)

 (7)
 Depressurize the Green and Yellow hydraulic systems (Ref. TASK 29-23-00-864-001).

 Component Location
 Figure 501/TASK 27-41-00-991-001
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 Subtask 27-41-00-020-052
 C. Removal of the protective covers
 (1)
 Remove the screws (4) and the washers (3).

 (2)
 Release the fasteners (1) and remove the protective covers (2) and (5). (Ref. Fig. 502/TASK 27-41-00-991-002)

 4. Procedure
_________
 (Ref. Fig. 501/TASK 27-41-00-991-001)
 Subtask 27-41-00-220-056
 A. Check of the dimensions
 (1) Make sure that there are 33.6 links 320.7 +11 -2.5 mm (12.6259 +0.4330 -0.0984 in.) between the shaft of the THS actuator input pinion and the end of the chain. (Ref. Fig. 503/TASK 27-41-00-991-003)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 27-41-00-820-050
 B. If the dimension you measured is not correct:
 -adjust the distance between the shaft of the THS actuator input pinion
 and the end of the chain.
 Do these steps :

 (1)
 Lock the tension regulator with the RIGGING PIN - THS MECHANICAL CONTROL (98D27407532000) (11).

 (2)
 Remove the locking clips from the turnbuckles and loosen the cables (Ref. Detail B).

 (3)
 Put the links of the chain on the pinion until:

 -there are 33.6 links 320.7 +11 -2.5 mm (12.6259 +0.4330 -0.0984 in.) between the shaft of the THS actuator input pinion and the end of the chain.

 (4)
 Remove the RIGGING PIN - THS MECHANICAL CONTROL (98D27407532000) (11).

 Removal/Installation of the Protective Covers Figure 502/TASK 27-41-00-991-002
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 Chain Adjustment Dimension
 Figure 503/TASK 27-41-00-991-003
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 **ON A/C 301-399,
 Subtask 27-41-00-820-050-A
 B. If the dimension you measured is not correct:
 -adjust the distance between the shaft of the THS actuator input pinion
 and the end of the chain.
 Do these steps:

 (1)
 Lock the tension regulator with the RIGGING PIN - THS MECHANICAL CONTROL (98D27407532000) (11).

 (2)
 In the FWD Cargo Compartment, remove the ceiling panel 131EC (Ref. TASK 25-54-12-000-002) and the partition 131PW (Ref. TASK 25-54-12-000-001).

 (3)
 Remove the recirculation filter LH side (Ref. TASK 21-21-41-000-001)

 (4)
 Remove the locking clips from the turnbuckles and loosen the cables (Ref. Detail B).

 (5)
 Put the links of the chain on the pinion until:

 -the dimension between the shaft of the THS actuator input pinion R and the end of the chain is 320.7 +11 -2.5 mm (12.6259 +0.4330 -R 0.0984 in.).
 (6) Remove the RIGGING PIN - THS MECHANICAL CONTROL (98D27407532000) (11).
 **ON A/C ALL
 Subtask 27-41-00-220-057
 C. Check of the dimension
 (1)
 In the cockpit, remove the floor panel 211EF (Ref. TASK 53-12-11-000-001).

 (2)
 Make sure that:

 -there are 33.5 links 320 mm (12.5984 in.) between the shaft of the lower trim assembly and the end of the chain. (Ref. Fig. 504/TASK 27-41-00-991-004)

 Component Location. Figure 504/TASK 27-41-00-991-004
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 27-41-00-820-051
 D. If the dimension you measured is not correct:
 -adjust the distance between the shaft of the THS actuator input pinion,
 and the end of the shaft.
 Do these steps:

 (1)
 Lock the tension regulator with the RIGGING PIN - THS MECHANICAL CONTROL (98D27407532000) (11).

 (2)
　
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