(a)
 Put the fork end of the link assy (88) on the target lever (90) and install the bolt (89), the bush (94), the washer (93) and the nut (92).

 (b)
 Tighten the nut (92) and safety it with the new cotter pin (91).

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 (5) Connect the drawbar (71) on the shaft lever (76) as follows:
 (a) Put the eye end of the drawbar (71) into the fork end of the shaft lever (76).
 (b) Install the bolt (72), the washers (73) and the nut (74) on the shaft lever (76).
 (c) Tighten the nut (74) and safety it with the new cotter pin (75).
 (6) Connect the drawbar (71) on the actuator arm (107) of the vent door as follows:
 (a) Put the eye end of the drawbar (71) into the fork end of the actuator arm (107).
 (b) Install the bolt (108), the washers (105), the bush (106) and the nut (104) on the actuator arm (107).
 (c) Tighten the nut (104) and safety it with the new cotter pin (103). 
R  **ON A/C 051-052, 
R  Subtask 52-31-21-420-052 
R R  C. Installation of the Gear Box (Ref. Fig. 404A/TASK 52-31-21-991-012-B) 
R R  (1) If removed, attach the flange bearing (21) on the support bracket of the cargo door structure as follows: 
R R  (a) Put the flange bearing (21) in the installation position of the support bracket. 
R R  (b) Install the bolts (20), the washers (22) and the nuts (23) and tighten them . 
R R  (c) When the sealant is dry, apply STRUCTURE PAINTS (Material No. 16-003) to protect the sealant. 

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R  (2) Install the gear box (27) on the cargo door structure as follows: 
R  (a) Put the trust plate (28) on the drive shaft of the gear box (27). 
R  (b) Put the laminated shim (26) on the output shaft of the gear box 
R  (27). 
R  (c) Move the output shaft of the gear box (27) into the structural 
R  bearing at longeron 4 and the flange bearing (21). 
R  (d) Install the screws (24) and the washers (25) and tighten them to 
R  attach the gear box (27) on the longeron 4. 
R  (e) Turn the output shaft of the gear box (27) to make sure that the 
R  gear rotates freely. 
R  (3) Connect the shaft lever (10) to the output shaft of the gearbox (27) 
R  as follows: 
R  (a) Put the shaft lever (10) in position on the output shaft and make 
R  sure that the pin holes are align. 
R  (b) Install the tapered pins (9), the sleeves (16), the washers (17) 
R  and the nuts (18) on the shaft lever (10). 
R  (c) Tighten the nuts (18). 
R  (d) Install the protection plug (18) on the top of the shaft lever 
R  (10). 
R  (4) Assemble the drive shaft lever (61) on the drive shaft of the gear 
R  box (27) as follows: 
R  (a) Put and hold the safety cam (30) and the lever (35) in the 
R  installation position on the cargo door frame. 
R  (b) Put the drive shaft lever (61) through the cargo door frame to 
R  engage it with the drive shaft of the gear box (27). 
R  (c) Make sure that the pin holes of the drive shaft lever (61), the 
R  lever (35) and the drive shaft are align. 
R  (d) Make sure that the gap between the trust plate (28) and the end 
R  of the drive shaft lever (61) is correct. 
R  NOTE : The gap must be between 0.2 mm (0.0078 in.) and 0.4 mm____ 
R  (0.0157 in.) to make sure that the gear rotates freely. 

R 1EFF : 051-052, 1 52-31-21Page 443 1 1 May 01/05 1 1 1CES 1

R  (e) Install the tapered pins (34), the sleeves (36), the washers (37) 
R  and the nuts (38) on the lever (35). 
R  (f) Tighten the nuts (38). 
R  (g) Make sure that the pin holes of the drive shaft lever (61) and 
R  the safety cam (30) are aligned. 
R  (h) Install the tapered pins (31), the washers (32) and the nuts (33) 
R  on the safety cam (30). 
R  (i) Tighten the nuts (33). 
R  Subtask 52-31-21-420-070 
R  D. Installation of the Linkage 
R  (Ref. Fig. 403A/TASK 52-31-21-991-003-B) 
R  (1) Connect the connection rod (51) to the vent door lever (54) of the 
R  safety shaft as follows: 
　
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