LANDING GEAR DOOR LATCHES
Q13-9. During normal operation, what component
disengages the down lock, allowing the nose
Landing gear hydraulic system maintenance is
landing gear cylinder to raise the nose gear?
similar to the other types of hydraulic system
Q13-10. During normal operation, what component
maintenance. This system is inspected for internal and
closes the nose landing gear doors?
external leakage as well as proper operation during
inspections. While performing operational checks, you
Q13-11. What is indicated in the pilot's position
must inspect the complete landing gear installation for
indicator when the landing gear is in transi-
adjustments, clearances, and sequence of operation.
tion from gear down to gear up?
The adjustment of latches is one of your prime
Q13-12. In addition to the pilot's position indicator,
concerns. A latch is used in hydraulic systems as a
what other device tells you that the landing
device designed to hold a unit in a certain designated
gear is in transit from gear down to gear up?
position after the unit has traveled through a part of its
Q13-13. During emergency operation, what indicat-
cycle. For example, when the landing gear is retracted
ions are shown on the pilot's position
in some landing gear systems, each gear is held in the
indicator and on the landing gear handle?
up position by a latch. The same holds true when the
Q13-14. What component of the emergency landing
landing gear is extended. Latches are also used to hold
gear system actuates the release valves on
the landing gear doors in the open or closed positions.
There are many variations in designs of latches. All
latches are designed to accomplish the same thing.
LANDING GEAR COMPONENTS
They must operate automatically, at the proper time,
and hold the unit in the desired position.
LEARNING OBJECTIVE: Identify the
components of the landing gear system.
The main landing gear forward door is held closed
by two door latches. As shown in figure 13-5, one latch
Various mechanical and hydraulic components
is installed near the front of the door and the other near
make up a landing gear system. The components
the rear of the door. To lock the door securely, both
discussed here are representative of those found on
locks must grip and hold the door tightly against the
most naval aircraft.
Figure 13-5.--Main gear door latch mechanisms.