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FIN | FUNCTIONAL DESIGNATION | PANEL |ZONE |ACCESS | ATA
| | | |DOOR | REF. -------------------------------------------------------------------------------2845GM ACTUATOR - NLG DNLK 711 32-31-23 8GA PROX SNSR-R 148 32-31-73 9GA PROX SNSR-L 147 32-31-73 10GA PROX SNSR-R 148 32-31-73 11GA PROX SNSR-L 147 32-31-73 12GA PROX SNSR-NLG 124 32-31-73 13GA PROX SNSR-NLG 123 32-31-73 14GA PROX SNSR-R 148 32-31-73 15GA PROX SNSR-L 147 32-31-73 16GA PROX SNSR-R 148 32-31-73 17GA PROX SNSR-L 147 32-31-73 18GA PROX SNSR-NLG 124 32-31-73 19GA PROX SNSR-NLG 123 32-31-73 20GA PROX SNSR-R 148 32-31-73 21GA PROX SNSR-L 147 32-31-73 22GA PROX SNSR-R 148 32-31-73 23GA PROX SNSR-L 147 32-31-73 24GA PROX SNSR-NLG 124 32-31-73 25GA PROX SNSR-NLG 123 32-31-73 26GA PROX SNSR-R 148 32-31-73 27GA PROX SNSR-L 147 32-31-73 28GA PROX SNSR-R 148 32-31-73 29GA PROX SNSR-L 147 32-31-73 30GA PROX SNSR-NLG 124 32-31-73 31GA PROX SNSR-NLG 123 32-31-73 32GA PROX SNSR-R 148 32-31-73 33GA PROX SNSR-L 147 32-31-73 34GA PROX SNSR-R 148 32-31-73 35GA PROX SNSR-L 147 32-31-73 36GA PROX SNSR-NLG 124 32-31-73 37GA PROX SNSR-NLG 123 32-31-73 38GA PROX SNSR-NLG 124 32-31-73 39GA PROX SNSR-NLG 123 32-31-73 40GA SEL VALVE-L/G 744 32-31-12 41GA SEL VALVE-L/G DOORS 744 32-31-34 8GB IND-R L/G 402VU 212 831 32-61-00 9GB IND-NLG 402VU 212 831 32-61-00 10GB IND-L L/G 402VU 212 831 32-61-00
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3. System Description__________________
The MLG and NLG are hydraulically operated and retract into bays in the fuselage. When the L/G is retracted, the L/G doors and the fairings align with the adjacent structure to make an aerodynamic contour.
The MLG retracts inboard, into the bays to the rear of the wing spar box, and into the fuselage (to the rear of the hydraulics bay).
The NLG retracts forward into a bay in the fuselage.
The L/G normal extension and retraction system divides into these parts:
-an electrical system
-a hydraulic system
-
the mechanical components.
A.
Electrical System
**ON A/C 301-399,
(Ref. Fig. 012)
**ON A/C ALL
The electrical system controls the operation of the L/G extension and retraction sequences. The system has two independently connected sub-systems, identified SYSTEM 1 and SYSTEM 2, that are electrically isolated from each other. Each sub-system contains an LGCIU and 16 proximity sensors. Each sub-system connects to:
-
the L/G control lever (6GA)
-
the L/G door selector valve (41GA)
-
the L/G selector valve (40GA)
-
the L/G isolation safety valve (49GA).
The two LGCIU's (which are the same) are identified LGCIU1 and LGCIU2, and can be in either SYSTEM 1 or SYSTEM 2. The LGCIU in SYSTEM 1 independently controls the operation of a circuit for the L/G downlock indicator lights. When an LGCIU is installed in SYSTEM 2 the independent circuits for the L/G downlock indicator lights are not used.
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INTENTIONALLY BLANK
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L/G Electrical Control - Block Diagram
Figure 012
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The LGCIU's are continuously supplied with power, but only one LGCIU controls the extension/retraction sequence at any one time. The control changes from one LGCIU to the other after each retraction/extension cycle (when the L/G control lever is moved away from the DOWN position) or when one LGCIU becomes unserviceable. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM LANDING GEAR 起落架4(33)
