757 MAINTENANCE MANUAL
D. Prepare for the Removal of the Nose Landing Gear
S 494-052
(1) Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
S 494-053
WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
S 864-003
(3)
Remove the pressure from the left hydraulic system and reservoir (AMM 29-11-00/201).
S 864-004
(4)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
On the main power distribution panel, P6:
1) 6G1, FIRE EXT APU or FIRE EXT 1
(b)
On the overhead panel, P11: 1) 11B33, APU REMOTE FIRE IND 2) 11C23, INTERPHONE CABIN SERVICE 3) 11C25, INTERPHONE FLT AMPL 4) 11C26, INTERPHONE ASP 2 BAT PWR or INTERPHONE F/O OBS 5) 11C29, PARK BRAKE GND IND 6) 11C30, LDG GEAR POS SYS 1 7) 11G29, INTERPHONE CAPT FLT AMPL PWR 8) 11G30, INTERPHONE PWR 9) 11H31, GND CALL 10) 11M3, LEFT LANDING NOSE GR PWR 11) 11M6, RUNWAY TURNOFF LEFT
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12) 11M30, RIGHT LANDING NOSE GR PWR 13) 11M33, RUNWAY TURNOFF R 14) 11N35, EMERGENCY CHARGER L 15) 11N36, EMERGENCY CHARGER R 16) 11S15, AIR/GND SYS 1 17) 11S19, AIR/GND SYS 2 18) 11S23, POS SYS 2
(c) On the APU/external power panel, P34:
1) 34G1, LIGHTS NOSE WHL WELL
S 014-005
(5)
Remove the aft doors for the nose landing gear (AMM 32-22-03/401).
S 864-006
(6)
Remove the pressure from the shock strut.
E.
Remove the Nose Landing Gear.
S 034-054
(1) Remove the cap for the air valve from the air valve on the top of the shock strut.
WARNING:_______LOOSEN THE SWIVEL NUT A MAXIMUM OF TWO TURNS. AIR PRESSURE CAN BLOW THE VALVE OUT AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(a)
Loosen the swivel nut a maximum of two turns.
(b)
When the shock strut is fully deflated, loosen the swivel nut to open the valve fully.
S 494-055
WARNING: DO NOT INSTALL THE SHOCK STRUT LOCK ON A PRESSURIZED SHOCK
_______ STRUT. AIR PRESSURE CAN BLOW THE LOCK OFF AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2) Lock the inner cylinder to the outer cylinder with the shock strut lock. Use the instructions supplied with the tool.
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S 584-007
(3) Lift the airplane nose approximately 12 inches (AMM 07-11-02/201).
S 034-008
(4) Disconnect the hydraulic lines from the top of the shock strut (View B). Put a cap on the ports and put a plug in the lines.
S 034-009
(5) Disconnect the electrical connectors from the aft wall of the wheel well (View B). Tie the electrical connectors to the trunnion on the nose landing gear.
S 034-010
(6) Disconnect the cables for the steering. (a) Remove the lock (23), the castellated nut (24), and the seal ring (33) from the left trunnion pin (View C-C). (b) Attach tags to the NWSA cable, the NWSB cable, the NGPPA cable, and the NGPPB cable (View D-D). (c) Disconnect the cables at the turnbuckles just above the pulley brackets on the lower left hand side. The turnbuckles are
(d) located in the electrical/electronics bay, panel 119BL (Ref 06-41-00/201).Move the seal assembly (32) and the cables out of the trunnion pin. Tie them to the shock strut. Make sure they are clear of all movable surfaces and equipment.
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