TB 1-1520-240-20-107
9.
NOTE
Ensure that all closed or stand alone hydraulic components such as landing gear
strut assemblies and blade lag shock absorbers are serviced with MIL-H-5606 only.
a.
Units which have inspected and reported servocylinders listed in paragraph 6 will fund the
Enhanced Special Repair Activity (ESRA) locations at Ft. Campbell or Ft. Rucker to:
(1) Order replacement steel end caps and associated hardware for the reported
servocylinders. The aluminum end caps will be replaced with chrome plated steel end caps. The new
steel end caps are not available at this time. Units will replace the actuator or have the ESRA change the
end caps NLT 30 June 2001. All servocylinders which have chrome plated aluminum end caps will be
replaced to reduce the possibility of chrome flakes contaminating the system.
(2)
Replace the individual parts which were ordered for the servocylinders.
(3)
Perform a leak check of the repaired servocylinders.
b. For any flight control or utility system hydraulic component received from supply, maintenance
personnel will drip drain preservative fluid. Maintenance personnel will manually stroke actuators,
rotating pump shafts, and motor shafts (if possible) to purge all preservative fluid. Refill the component
with MIL-H-83282 prior to installation (if possible).
Use factory sealed hydraulic fluid containers only. Do not use hydraulic fluids that have been
C.
exposed to the environment. Hydraulic fluids have a natural tendency to absorb moisture which will
contaminate the fluid and increase the probability of corrosion damage.
d.
Continue to observe proper maintenance procedures for aircraft hydraulic systems:
Upon removal for maintenance, cap or plug all disconnected lines, fittings, and
(1)
components as soon as practical.
Inspect for contamination all hydraulic components and lines not installed on aircraft or
(2)
in supply. Cap those components and lines after inspection and/or cleaning.
e. Upon receipt of the purification equipment, hydraulic system purification will be performed at the
end of each phase inspection. Units will purify all aircraft hydraulic systems to remove water, chlorine,
and particles. The CH-47 PM Office (PMO) is acquiring hydraulic purifiers for each CH-47 unit and AVIM
that supports the CH-47 fleet. These purifiers will remove water, chlorine, and particles from the aircraft
hydraulic system. Each unit and AVlM will provide a local POC to the Logistics POC listed in paragraph
4
