Figure 12-18.-High-prcssure air valve, type MS 28889.
Support the recoil strut and partially pull the
crossbolt at the top of the strut to disengage it from the
support structure. Lower the strut and reinstall the bolt
Installation essentially reverses the removal
procedures. With the aircraft still on jacks, carefully
move the top of the recoil strut into place to engage the
support structure fitting. Install the crossbolt, washer,
nut, and cotter pin. Connect the shrink rod to the shrink
rod fitting. Connect the side brace to the support
structure fitting. Partially pull the upper torque arm pin
and connect the drag brace. Reinstall the pin, tongued
washer, nut, and cotter pin.
Assemble the brake and wheel to the strut axle,
bleed the brake, and service the strut as specified in the
aircraft MIM. Ensure that the air valve is safety wired
before charging the strut with nitrogen. After the strut
has been serviced with hydraulic fluid and nitrogen,
tighten the air valve to the specified torque value
required by the MIM. Replace all removed fairings,
doors, hydraulic lines, and electrical connections.
Lubricate all reinstalled linkages, and check the landing
gear for proper operation.
SERVICING, BLEEDING, AND
INSPECTING SHOCK STRUTS
For efficient operation of shock struts, the proper
fluid level and pneumatic pressure must be maintained.
Before you check the fluid level, you should consult the
aircraft MIM. Deflating a strut can be a dangerous
operation unless the servicing personnel are thoroughly
familiar with high-pressure air valves and observe all
the necessary safety precautions.
The high-pressure air valve shown in figure 12-18
is used on most naval aircraft. This air valve is used on
struts, accumulators, and various other components that
must be serviced with high-pressure air or nitrogen.
The following procedures for deflating a typical
shock strut, servicing with hydraulic fluid, and
reinflating is for instructional purposes only. See figure
12-19. For specific aircraft consult the appropriate
1. Position the aircraft so that the shock struts are
in the normal ground operating position. Ensure that
personnel workstands, and other obstacles are clear of
NOTE: Some aircraft must be placed on jacks
with their struts completely extended for
2. Remove the cap from the air valve, as shown
in view A of figure 12-19.