BLADE SEAL DOOR
SEE B
CRANK-TO-DOOR
LINK ROD END
SEE A
BLADE SEAL DOOR
SEE B
EDGE OF BODY CUT OUT
A A
1.00 |0.10
INCH A
UPPER DOOR 1
1.00 |0.10
INCH LOWER DOOR
MEASURING
POINT A
A |0.08 INCH
MAX MISMATCH
BODY
FWD
B
DOOR
1
AIRPLANES WITH UPPER SEAL DOORS A-A
AND THEIR MECHANISM (FIG. 202)
Seal Door Measurement Points and Rod End Checking
Figure 204
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400
MAINTENANCE MANUAL
S 862-044
(6)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7E7, STAB TRIM L S/O VLV
2) 7E20, STAB TRIM R S/O VLV
S 862-073
(7)
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).
S 862-045
(8)
If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).
S 492-046
(9)
Install the air blower and the hose to supply air to the stabilizer center section.
E.
Adjust the Door Mechanism
S 822-047
(1)
Adjust the door mechanism:
(a)
Remove stabilizer blade seals.
(b)
Remove the shims from between the door and the drive fitting on the upper door. 1) Add the shims at this location only if it is necessary for
the clearance.
(c)
The jackscrew must be free to travel the full distance between the jackscrew stops when you adjust the door mechanism.
NOTE: Adjust the upper links with the stabilizer in the full
____ down position. Adjust the lower links with the stabilizer in the full up position.
(d)
Set the stabilizer B dimension.
(e)
Disconnect the mast-to-crank link.
(f)
Adjust the rod ends of the crank-to-door link.
(g)
Without a load on the door, set the door to align with the body at |0.08 inch (|2.0 millimeters).
(h)
Adjust the crank-to-door link until the link will just fit.
(i)
With the crank in the center position, turn the rod end of the crank-to-door link one to two turns to put a load on the door.
(j)
Adjust the rod ends of the crank-to-door link to make sure the rod ends move freely at the crank.
NOTE: You can tell the rod ends move freely when you can turn
____ the links along the link axis for all crank positions.
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A
747-400 MAINTENANCE MANUAL
(k) Connect the mast-to-crank links with the bolts, washers and nuts. 1) Adjust the mast-to-crank links to the limits in table II
(Fig. 203). 2) Make sure the drain holes are pointed down. 3) Tighten the nuts to 20-25 pound-inches (2.3-2.8
newton-meters).
S 092-055
(2)
If they are not necessary, remove the hose and the air blower.
S 862-076
(3)
Set the STAB TRIM 2 and 3 switches to ON.
S 862-077
(4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P7, Overhead Circuit Breaker Panel
1) 7E7, STAB TRIM L S/O VLV
2) 7E20, STAB TRIM R S/O VLV
S 412-080
(5) Close the access doors 312A and 315A (AMM 06-09-05/201).
TASK 27-41-14-712-056
7. Operational Test - Horizontal Stabilizer Body Seal Door
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