Replacement Of Bell Crank Bolts - BOMBARDIER Chalenger 604 Supplemental Maintenance Manual

2.6

Replacement of Bell Crank Bolts

Before replacing the bolts it is advisable to read paragraph 2.4.3, Removal of Bell Crank
Assembly. Consult this paragraph and Figures 1, 2 and 3 to locate the bell cranks (1135-103-
1 and 1135-103-2).
NOTE: For this replacement procedure there is no need to disconnect either the cable from
the outer arm or the link (1135-110) from the inner arm.
2.6.1 Tools
Diagonal cutters
Needle nose pliers
3/8-inch hex wrench
Torque wrench or driver with 40 inch-lb capability, equipped with a 3/8-inch hex socket.
2.6.2 Removal
Each bell crank has two arms: an outer arm and an inner arm. Each arm is connected to the
bell crankshaft with a bolt and nut. This bolt is secured with safety wire.
Remove the safety wire and remove the bolts to be replaced from each arm, one at a time,
without disturbing the position of the arm on the shaft. There are a total of four bolts, one on
each of the left and right outer arms, and one on each of the left and right inner arms.
Remove and replace each one to be replaced before going on to the next bolt.
2.6.3 Replacement
Replace bolt with a hex head shoulder bolt (P/N 59355), torqued to 40 inch-lb. Thread a
Nylock nut (P/N MS 21044-CO8) on the exposed thread of the bolt which comes through the
arm. Then holding the head of the bolt with a 3/8-inch wrench, torque the nut to 40 inch-lb.
(See the following figure 1.)
Repeat this procedure for each bolt exchange, and safety wire each bolt.
2.6.4 Rigging
The above process will probably have a negligible effect on rigging. However, the rigging
must be checked after breaking a connection in the throttle control, and adjusted as required.
Note that a minimum of "cushion" should be employed at full power and at flight idle.
Excessive cushion will store a load in the clutches, resulting in a heavy force requirement to
move the throttles out of those positions.
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