Pilot’s Operating Handbook Section 7
EXTRA 500 Description of Airplane and Systems
7.10 Landing Gear
The aircraft is equipped with a hydraulically operated, re-
tractable landing gear.
The main gear is equipped with an oil shock absorber in a
parallel guide rod. It retracts against flight direction after
rotating the wheel 90° forward. The nose gear is equipped with
an internal shock absorber and retracts aft in the nose gear
compartment.
Nose gear doors are positively guided. During ground
operation, a weight-on-wheels safety (squat) switch located at
the nose gear shock absorber prevents accidental gear retraction
regardless of landing gear switch position.
The hydraulic power system includes equipment that provides a
flow of pressurized hydraulic fluid to the landing gear system as
well as to the respective landing gear doors.
The operation of the hydraulic system is divided in three
circuits actuating the following devices:
Firstly the lower main gear doors, secondly the upper main gear
doors, thirdly the main landing gear struts and the nose gear
strut and doors.
The basic gear down cycle is:
1 Opening of the lower main doors,
opening of the upper main gear doors,
and extracting the three gear units simultaneously.
2 Closing the upper main gear doors.
The gear up cycle is:
1 Opening the upper main gear doors.
2 Retracting the three gear units.
3 Closing the upper doors.
4 Closing the lower doors.
Changing from gear up to gear down and vice versa is possible
at any time of during operation.
26. January 2011 7-17
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