S 832-050
(21)
Connect the actuator rod of the sequence valve to the corner of the left door (View F, Fig. 201). If you cannot easily install the bolt, do the steps that follow:
(a) Adjust the fitting on the left door where the operator rod
attach to the door.
NOTE:____ Loosen the bolts and move the fitting on the serrated
plates.
(b) Open the door to the dimension shown (View H-H, Fig. 202).
(c) Make sure the clearance between the outboard edge of the door
and the fuselage skin panel is 0.10 inch minimum.
(d) Connect the actuator rod of the sequence valve to the left
door.
S 092-051
CAUTION: REMOVE THE RIG PIN WITH THE DOOR CONNECTED TO THE ACTUATOR ROD.
_______ IF YOU DO NOT REMOVE THE RIG PIN, YOU WILL CAUSE DAMAGE TO THE SEQUENCE VALVE MECHANISM WHEN THE DOOR IS CLOSED.
(22) Remove the rigging pin (NG-1) from the sequence valve mechanism.
S 222-052
CAUTION: MEASURE CLEARANCE ONLY WHEN HYDRAULIC PRESSURE IS OFF.
_______ BECAUSE OF STRUCTURE MOVEMENTS, THE SENSOR GAP WILL DECREASE AS THE DOOR HYDRAULIC PRESSURE IS INCREASED. AS A RESULT AN INCORRECT INDICATION OF THE SENSOR GAP WILL BE SHOWN.
(23)
Make sure the warning sensor gap of the nose landing gear agrees with the dimensions shown (View A-A, Fig. 203).
(a)
Add or remove shims to change the sensor gap if it is necessary.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 862-054
(24)
Move the ground release handle to the close position (See "Ground Door Release Handle Close Operation").
S 222-055
(25)
Make sure the forward edge of the door aligns with the fuselage skin (View A-A, Fig. 202).
S 862-056
(26)
Remove the system No. 1 hydraulic power if it is not necessary (AMM 29-11-00/201).
TASK 32-22-01-202-057
5. Forward Nose Wheel Well Doors Inspection/Check (Fig. 204)______________________________________________
A. Standard Tools and Equipment
(1)
Micrometers - Inside and outside measuring
B.
Access
(1)
Location Zone
711 Nose Landing Gear Door, Forward, LH
712 Nose Landing Gear door, Forward, RH
C.
Procedure
S 022-058
(1)
Remove the components you will examine.
S 222-059
(2)
Do a check of the wear limits:
(a)
Measure the applicable parts and compare the measured dimensions to the limit dimensions.
(b)
If the part is not in tolerance,
repair or replace as necessary.
TASK 32-22-01-862-061
6. Ground Door Release Handle Open Operation_________________________________________
A. Access
(1) Location Zone
711 Nose Landing Gear Door, Forward, LH
712 Nose Landing Gear Door, Forward, RH
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
DOOR ACTUATOR +0.03
BELLCRANK
BELLCRANK SUPPORT
OPERATOR ROD
FWD
SEE A HANDLE RELEASE GROUND
INSTALLATION FAIRING FLAPPER DOOR
A SWITCHES TARGET DOOR
A
0.15 INCH
-0.03
(CLEARANCE IS WITH THE DOOR CLOSED AND LOCKED
FWD
FWD AND HYDRAULIC PRESSURE OFF)
(NOSE GEAR DOOR SHOWN IN CLOSED POSITION) A A-A
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