(2)
Make sure that the support brackets of the bellcrank assembly are correctly installed to the aircraft structure and are in safety.
(3)
Carefully examine the control-rod levers of the bellcrank assembly for correct alignment to the door control-rods.
(4)
Make sure that the eye-ends of the control-rods are correctly installed to the bellcrank levers and are in safety.
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NLG Door Operating Mechanism.
Figure 601/TASK 32-30-00-991-001
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1 1 Feb 01/98
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(5)
Examine the door actuating cylinder for:
-impact damage
-signs of hydraulic leaks
-pitting and/or scoring of the chromium plating of the piston rod
-cracks, specially around the area of the connection to the bellcrank assembly and the mounting bracket.
(6)
Make sure that the actuating cylinder is correctly installed to the bellcrank assembly and the mounting-bracket on the aircraft structure.
(7)
Make sure that the actuating cylinder is in safety.
(8)
Examine the actuating-cylinder mounting-bracket for:
-impact damage
-cracks
-damage to the protective finish
-corrosion.
(9)
Make sure that the actuating-cylinder mounting-bracket is correctly installed to the aircraft structure.
(10)
Make sure that the actuating cylinder is correctly aligned between the bellcrank assembly and the mounting-bracket.
(11)
Make sure that the hydraulic pipes and connections are in the correct condition.
(12)
Examine the door control-rods for:
-impact damage
-cracks, dents and corrosion.
(13)
Make sure that the door control-rods are:
-
correctly installed and in safety
-
correctly aligned between the bellcrank levers and the door hinge-points.
(14)
Examine the door hinges for:
-impact damage
-cracks, wear and corrosion
-damage to the protective finish.
(15)
Look for signs of delamination of the door structure, specially around the area of the door hinges.
(16)
Make sure that the bonding leads to the door hinges are in the correct condition.
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(17) Make sure that the proximity sensors, targets and their related mounting-brackets are in the correct condition. ________
5. Close-up
Subtask 32-30-00-410-051
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the NLG doors (Ref. TASK 32-22-00-410-001). Subtask 32-30-00-942-051
B. Removal of Equipment
(1)
Remove the safety barriers.
(2)
Remove the warning notice(s).
(3)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
1EFF : ALL 1 32-30-00Page 605 1 1 Feb 01/98 1 1 1CES 1 NORMAL EXTENSION AND RETRACTION - DESCRIPTION AND OPERATION
___________________________________________________________
1. General_______
The landing gear (L/G) normal extension and retraction system has electrical control and hydraulic operation, to extend and retract the Main Landing Gear (MLG) and doors (Ref. 32-10-00) and the Nose Landing Gear (NLG) and doors (Ref. 32-20-00). The electrical control system has:
-a L/G control-lever
-two Landing Gear Control and Interface Units (LGCIU)
-
a gear electro-hydraulic selector valve
-
a door electro-hydraulic selector valve
-
a L/G electro-hydraulic safety valve
-32 proximity sensors and their related targets
-a set of indicator lights (Ref. 32-61-00).
The electrical control system has two sub-systems, SYSTEM 1 and SYSTEM 2 which operate independently of one another. Each sub-system has:
-an LGCIU
-16 proximity sensors (and their related targets)
-isolated electrical supplies.
The SYSTEM 1 gets electrical power from the Essential busbar and the SYSTEM 2 gets electrical power from the Normal busbar.
Each sub-system connects to the L/G control lever and to the gear and door selector valves. To keep the two sub-systems electrically isolated, each has its own electrical connections. The selector valves have two solenoid windings, for extension of the L/G and two for retraction of the L/G. The L/G control lever has two sets of switches for each selection position.
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