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Task 32-21-05-400-804-A01 Installation of the NLG Upper-Drag-Brace
1.
General
 
A.
The maintenance procedure that follows is for the installation of the nose landing gear (NLG) upper drag brace (written as the "drag brace" in this procedure). The drag brace is installed between the NLG wheel well structure and the shock strut assembly.
2.
Job Set-Up Information
 
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A.
Tools and Equipment
DESIGNATION
Commercially Available Wrench - Torque, 0 to 75 lbfin (0 to 8 Nm)
Commercially Available Grease Gun - Multi Heads
Commercially Available Strap Wrench
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B.
Consumable Materials
CONSUMABLE
04-010 Grease, Aeroshell #33
11-007 Methyl ethyl ketone (MEK)
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D.
Reference Information
REFERENCE
DESIGNATION
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Lowering of the Aircraft
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Lowering at the Nose Jacking Point
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Operational Test of the Landing-Gear Extension/Retraction System
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Nose Landing Gear Extension and Retraction
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Installation of the Flight Controls Access Panel (131AL/132AR)
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E.
Standard Practices Information
REFERENCE
DESIGNATION
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Installation of Cotter Pins
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Solvent Cleaning
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Electrical Bonding Test
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3.
Procedure
 
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A.
Install the drag brace (1) as follows:
(1)
Connect the upper end of the drag brace (1) as follows:
(a)
With methyl ethyl ketone, clean the trunnion pins (24) and the drag brace (1).
(b)
Apply a thin layer of the grease to the trunnion pins (24), the drag brace (1) and the trunnion bearings.
(c)
Install the trunion pins (24) into the trunion bearings.
(d)
Put the drag brace (1) in position between the trunnion bearings.
(e)
Slide the trunnion pins (24) through the trunnion bearings and into the drag brace (1).
(f)
Align the cross bolt holes in the drag brace (1) and the trunnion pins (24).
(g)
With methyl ethyl ketone, clean the cross bolts (21) and the washers (19) and (20).
(h)
Apply a thin layer of the grease to the cross bolts (21) and the washers (19) and (20).
(i)
Align the brackets (22) and (23) over the cross bolt holes on the drag brace (1).
(j)
On the right trunnion of the drag brace (1) install the cross bolt (21) and the bonding strap.
(k)
On the left trunnion of the drag brace (1) install the cross bolt (21) and the washer (20).
(l)
Install the washers (19) and the nuts (18).
Note: An additional washer can be added to make sure that you get a correct cotter pin alignment.
(m)
Torque the nuts (18) from 30 to 40 lbfin (3.39 to 4.52 Nm).
(n)
Safety the nuts (18) with a new cotter pins (17).
(2)
Install the caps (13) on the trunnion bearings as follows:
(a)
Apply grease to the new packing (16).
(b)
Install a new packing (16) on the trunnion bearing.
(c)
Put the caps (13) in position.
(d)
Install the washers (15) and the bolts (14).
(e)
Torque the bolts (14) from 40 to 50 lbfin (4.52 to 5.65 Nm).
(3)
Connect the door mechanism link as follows:
(a)
Apply a thin layer of the grease to the pin (12) and the washer (11).
(b)
Put the door mechanism link in position.
(c)
Install the pin (12), the washer (11), and the nut (10).
(d)
Torque the nut (10) from 80 to 110 lbfin (9.04 to 12.43 Nm).
(e)
Safety the nut (10) with the a new cotter pin (9).
(4)
Connect the lower end drag brace (1) to the apex hinge attachment as follows:
(a)
With methyl ethyl ketone, clean the apex pin (8), the bolt (7), and the washer (9).
(b)
Apply a thin layer of the grease to the apex pin (8), the bolt (7), and the washers (4) and (5).
(c)
Put the lower end drag brace (1) in position with the apex hinge attachment.
(d)
Install the drive arm (29) in position.
(e)
Apply a thin layer of grease to the shank and the threads of the pins (26) and the faces of the washer (27).
(f)
Install the pins (26), the washers (27) and the nut (28).
(g)
Torque the nut from 10 to 12 lbfin (1.13 to 1.35 Nm).
(h)
Install the apex pin (8).
Note: Use the strap wrench until you can easily install the apex pin.
(i)
Install the bolt (7), the drag strut cap (6), the washers (4) and (5) and the nut (3).
(j)
Torque the nut (3) from 15 to 20 lbfin (1.70 to 2.26 Nm).
(k)
Safety the nut (3) with a new cotter pin (2).
(l)
Remove the strap wrench.
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4.
Close Out
 
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A.
Remove all tools, equipment, and unwanted materials from the work area.
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B.
Install the access panels that follow:
Panels
PANEL
NAME
REFERENCE
131AL
Flight Controls Access Panel
132AR
Flight Controls Access Panel
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C.
Do the lubrication of the drag brace (1) as follows:
(1)
Connect the grease gun to the lubrication fittings (25).
(2)
Apply the grease to the lubrication fittings (25) until the grease comes out.
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D.
Do one of the procedures that follow :
(1)
If the aircraft is lifted on jacks (at the three jacking points), do the operational test of the landing gear extension/retraction system (
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TASK 32-30-00-710-801
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).
(2)
If the aircraft is lifted at the nose jacking point only, do the nose landing gear extension and retraction (
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TASK 32-30-00-865-802
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).
E.
Do one of the procedures that follow to lower the aircraft:
(1)
If the aircraft is lifted on jacks (at the three jacking points), lower the aircraft (
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TASK 07-11-01-586-801
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).
(2)
If the aircraft is lifted at the nose jacking point only, lower the aircraft (
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TASK 07-13-01-586-801
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).
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NLG Upper-Drag-Brace

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