practices and procedures to prevent contamination.
MIL-H-81019
Supervisory and quality assurance personnel must
MIL-H-81019 is an ultra-low temperature
know and ensure compliance with accepted standards.
hydraulic fluid. It is used in aircraft when extremely
Each maintenance level needs to accept their applicable
l ow s u r r o u n d i n g t e m p e r a t u r e s a r e ex p e c t e d .
responsibility. Supervisory personnel at each level of
MIL-H-81019 consists of petroleum products with
maintenance should indoctrinate and train personnel
additive materials to improve its viscosity (temperature
and implement procedures that apply to that level of
characteristics), increase its resistance to oxidation,
maintenance.
inhibit corrosion, and act as an antiwear agent. It is
The Hydraulic Contamination Control Program is
dyed red so it can be distinguished from other
defined in the Naval Aviation Maintenance Program
incompatible hydraulic fluids. In extreme
(NAMP), OPNAVINST 4790.2 (series). Within the
emergencies, it is interchangeable with hydraulic
scope of this program, training must be consistent with
fluid MIL-H-5606 and MIL-H-83282. MIL-H-81019
the objectives of an effective aircraft hydraulic system
is designed to operate in hydraulic systems having a
contamination control program. At all maintenance
temperature range between -90F to +120F.
levels, personnel must be trained in matters pertaining
to hydraulic systems contamination control using
MIL-H-46170
Hydraulic Contamination Control Training Device
4B38A or Videotape Number 802577DN. The
The primary use of MIL-H-46170 is as a
Hydraulic Contamination Control Program requires
preservative fluid for hydraulic systems and com-
you to follow the correct procedures during fluid
ponents storage. Components serviced with this
sampling, maintenance procedures, and practices.
preservation fluid should be drip drained and filled with
MIL-H-83282 prior to being installed. This fluid
FLUID SAMPLING
should not be mixed under any other condition. It is also
used as a testing medium in stationary test stands that
Contamination measurement standards and
have a temperature range between -40F to +275F. It is
acceptability limits define and control hydraulic
dyed red so it can be distinguished from incompatible
contamination levels. The maximum acceptable
fluids.
hydraulic fluid particulate level is Navy Standard Class
5 for naval aircraft and Navy Standard Class 3 for
NOTE: When mixing or combining hydraulic
related SE. The contamination level of a particular
fluids, the aircraft logbook or S/E logs and records need
system is determined by analysis of a fluid sample
to be annotated when this is done.
drawn from the system. Analysis is accomplished at all
Q8-1. What is the primary use for MIL-H-46170
levels of maintenance through the use of
hydraulic fluid?
Contamination Analysis Kit 57L414. Hydraulic system
fluid sampling is accomplished on a periodic basis
Q8-2. W h a t i s t h e t e m p e r a t u r e r a n g e o f
according to the applicable maintenance instruction
MIL-H-83282 hydraulic fluid?
manual (MIM), maintenance requirement cards
Q8-3. Where do you annotate that you have mixed
(MRC), and rework specification. Figure 8-1 shows the
hydraulic fluid in a particular aircraft?
requirements for periodic fluid surveillance.
You should perform analysis of hydraulic systems
HYDRAULIC CONTAMINATION
if extensive maintenance and/or crash/battle damage
CONTROL PROGRAM
occurs. You should perform the analysis when a
metal-generating component fails, an erratic flight
LEARNING OBJECTIVE: Recognize the
control function or a hydraulic pressure drop is noted,
purpose and procedures of the Navy's
or there are repeated and/or extensive system
Hydraulic Contamination Control Program.
malfunctions. Analysis is performed when there is a
Hydraulic contamination in Navy and Marine
loss of system fluid, or when the system is subjected to
Corps aircraft and related support equipment (SE) is a
excessive temperature. Analysis is also performed
major cause of hydraulic system and component
when an aircraft is removed from storage in accordance
failure. Every technician who performs hydraulic
with NAVAIR 15-05-500. You should perform analysis
maintenance should be aware of the causes and effects
of the hydraulic system anytime hydraulic con-
of hydraulic contamination. You should follow correct
tamination is suspected.
8-2
