Section I. GENERAL

TB 55-1500-334-25

Section I. GENERAL

a. Flashpoint. The lowest temperature at which

1-1. Introduction.

the fluid will give off sufficient vapor to ignite momentarily

when a flame is applied to the vapor.

a. MIL-H-5606 is a petroleum base hydraulic fluid

and is presently specified for use in most A my rotary

b. Fire point. The lowest temperature at which

wing and fixed wing aircraft. Because of its relatively low

the vapor given off will burn continuously after the source

flashpoint (200 ), it has been considered a safety

of ignition is removed.

hazard. In an effort to remove the vulnerability of aircraft

systems and related support equipment to accidental or

Spontaneous ignition temperature.

The

combat-incurred fires, hydraulic fluid MIL-H-83282 has

temperature at which the fluid ignites without an external

been developed as a directly interchangeable fluid which

flame or spark.

is significantly less susceptible to fire (flashpoint 400 ).

d. Closed and/or dead end components. These

MIL-H-83282 consists of a synthetic

are hydraulic components that are self contained and

hydrocarbon base and contains additives which provide

have little or no circulation of hydraulic fluid. These

superior anti-wear characteristics and inhibit oxidation and

components may be a part of a basic hydraulic system

corrosion MIL-H-83282 has an operational high

but may be "closed" from the basic system until actuation

temperature limit of 400 as compared to 275 for MIL-

of the component is required, (e.g., closed system, lag

H-5606.

These factors should provide significantly

dampeners and shock struts; dead end component, cargo

improved reliability.

Flashpoint, fire point, and

hook emergency release).

spontaneous ignition temperatures of MIL-H-83282

exceed that of MILH-5606 by greater than 200 , and

e. Viscosity. The measure of the resistance to

tests show that MIL-H-83282 extinguishes itself when the

external source of flame or heat is removed. MIL-H-

flow of a liquid at specific temperatures

83282 s compatible with all materials used in systems

presently employing hydraulic fluid MIL-H-5606 and may

1-4. Report of Equipment Publication Improvements.

be combined with the latter fluid with no adverse effect

except a degradation of its fire-resistant properties.

Report of errors, omissions, and recommendations for

However, the presence of MILH-5606 in amounts

improving this publication by the individual user is

exceeding 3 percent by volume will compromise the fire-

encouraged. Reports should be submitted on DA Form

resistant performance of MIL-H-83282. Although MIL-H-

2028 (Recommended Changes to Publications and Blank

83282 exceeds the performance of MIL-H-5606 at normal

Forms) and forwarded direct to Commander, US Army

temperatures, the viscosity of MIL-H-83282 increases at

Aviation Systems Command, ATTN: AMSAV-MMD, 4300

low temperatures, therefore use of MIL-H-83282 must be

Goodfellow Blvd., St. Louis, MO 63120.

within the limitations set forth In Section IV of this

technical bulletin.

1-5. Scope.

1-2. Purpose.

a. This technical bulletin Is published to provide

field personnel with specific instructions for initial

The purpose of this TB is to provide instructions

conversion of Army aircraft and ground servicing

for converting hydraulic systems from MIL H-5606 to MIL-

equipment from MIL-H-5606 hydraulic fluid to MIL-H-

H-83282 hydraulic fluid.

The TB also provides

83282, a fire resistant hydraulic fluid. Once conversion of

instructions for testing the hydraulic fluid in converted

aircraft Is complete, essential information from this TB will

systems to determine the adequacy of flushing

be Incorporated in the aircraft maintenance manuals, and

procedures.

this TB will be cancelled.

1-3. Definitions.

b. Deleted.

For the purpose of this bulletin, the following

definitions will apply:

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