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M36715
A
757 MAINTENANCE MANUAL
FWD
"I" FRAME BRACKET (4 LOCATIONS) TELESCOPING SEE A BEAM
TURNBUCKLE TROLLEY PINS INVERTED "T" TRACK 1
PINS TELESCOPING BEAM
TRACK INVERTED "T" RAIL HANGER
FISHPOLE HOIST TROLLEY SLING
BALLSCREW
FWD
A
1 ACCESS DOOR 311AL IS BETWEEN THESE TWO FRAMES. Stabilizer Jackscrew Adjustable Beam Assembly Figure 603
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757 MAINTENANCE MANUAL
(b) Install the sling as follows:
1) To install the spring-loaded beam assembly, do the steps that follow: a) Remove the mid-length safety pin. b) Install the spring-loaded beam assembly between the
bulkheads on each side of access door 311AL.
NOTE: Refer to Fig. 603 for the beam position as
____ related to the centerline of the airplane.
c) Install the mid-length safety pin.
2) Install the inverted T track and trolley between the lateral front frame of the I frame and the beam rail hanger.
NOTE: This allows the ballscrew actuator to be moved
____ forward and left outboard from the airplane centerline to a position over the access door.
a) Use the two pins that are supplied to install the
inverted T track and trolley. 3) Attach the fishpole hoist to the trolley. 4) Move the trolley over the actuator. 5) Attach the sling as a choker around the jackscrew upper
gimbal.
F. Inspect the Stabilizer Trim Upper and Lower Gimbal (Fig. 601)
S 496-009
(1)
Attach a support to the actuator before you remove gimbal pins.
S 216-002
(2)
Inspect the stabilizer trim upper gimbal.
(a)
Remove the upper gimbals from the stabilizer and jackscrew attach points.
(b)
Examine the upper gimbal carefully for cracks.
(c)
Examine the jackscrew and ballnut for cracks and more than usual wear.
(d)
Install the upper gimbals in the stabilizer-to-jackscrew attach points.
S 216-003
(3)
Inspect the stabilizer trim lower gimbal.
(a)
Remove the safety pin from the lower gimbal-to-structure joint and the pin assemblies from lower gimbal-to-housing joint.
(b)
Remove the lower gimbal sleeve.
(c)
Remove the nut and spacer from the upper end of the jackscrew safety rod.
(d)
Remove the safety rod and socket through the bottom of actuator.
(e)
Use a borescope to examine the entire ballscrew inner diameter.
(f)
Remove the socket from the safety rod.
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757 MAINTENANCE MANUAL
(g)
Examine for wear between the safety rod, the socket, and the sleeve.
(h)
Carefully inspect the lower gimbal assembly and the primary brake housing for cracks.
(i)
Clean and examine all disassembled parts.
(j)
Apply a light coat of grease on all unpainted faying surfaces.
(k)
Assemble and install all disassembled parts.
(l)
Fill the space between the socket, the sleeve, and the safety rod flange with grease.
(m)
Connect the actuator lower gimbal to the structure.
S 096-010
(4) Remove the adjustable beam assembly for the horizontal stabilizer jackscrew (Fig. 603).
S 646-011
(5) Lubricate all the grease fittings on the stabilizer-trim ballscrew ú actuator (AMM 12-21-05/301). ú ú S 736-012 ú (6) Do the stabilizer trim control system test (AMM 27-41-00/501).
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