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plated in accordance with Specification QQ-
MIL-H-8775-Hydraulic System Com-
P-416 zinc plated in accordance with Specific-
ponents, Aircraft and
cation QQ-Z325, or chromium plated in
Missiles, General Spec-
accordance with Specification QQ-C-320.
ification for
STANDARDS
3.3.3 Plastic parts. Plastic parts used in
hydraulic fuses shall be capable of meeting
MIL-STD-129--Marking for Shipment
the test requirements of Specification MIL-
and Storage
P-5517.
DRAWINGS
3.4 Design and construction.
Air FOrce--N AVY AERONAUTICAL
3.4.1 General design. The design of auto-
--Fuse--Hydraulic Quan-
AN6281
matic quantity-measuring hydraulic fuses .
tity-Measuring, Class
shall conform to applicable AN standards and
3000
be such as to offer the minimum restriction
--Fuse--Hydraulic Quan-
AN6282
to flow in the open position, smallest size, and
tity-Measuring, Class
minimum weight consistent with the other
3000
requirements of this qualification.
AND10050 ---Bosses--Standard Dimen-
sions for Gasket Seal
3.4.2 Shape and dimensions. Hydraulic
Straight Thread
fuses as specified in 1.2(a) shall conform to
AN6281. Fuses as specified in 1.2(b) shall
PUBLICATIONS
conform to AN6282.
AIR FORCE--NAVY AERONAUTICAL SPECIFI-
3.4.3 Tube connections. All tube connec-
CATION BULLETIN
tions for fuses shall be of the internal type,
No. 438--Age Controls for Synthetic
straight-threaded, conforming to Drawing .
Rubber Parts
AND110050.
3. REQUIREMENTS
3.5 Performance.
3.1 General requirements. The require-
ments of Specification MIL-H-8775 apply as
3.5.1 Rate of flow. The rated flow for each
requirements of this specification. Where the
size fuse shall be in accordance with the re-
two specifications conflict, this specification
quirements of Specification MIL-H-5440 for
shall govern.
the line size represented.
3.2 Qualification. The fuse furnished un-
3.5.2 Temperature range. Hydraulic fuses
der this specification shall be a product which
shall be designed to operate over a tempera- o
has been tested, arid passed the qualification
ture range from minus 54 C. to plus 71 C;
tests specified herein, and has been listed on
o
0
(minus 65 F. to plus 160 F.).
or approved for listing on the applicable
3.6 Magnetic particle inspection. All mag-
qualified products list.
netizable highly-stressed parts shall be sub-
3.3 Materials.
jected to magnetic inspection in accordance
with Specification MIL-I-6868. Where nec-
3.3.1 Non-metallic packings and seals. The
essary such inspection shall be called for on
use of non-metallic packings on moving parts
the manufacturer's drawings. Cracks or other
shall be kept to a minimum. If used, non-
injurious defects disclosed by magnetic in-
metallic seals and their installation shall be
spection shall be cause for rejection.
in accordance with Specification MIL-P-5514.
3.7 Operational marking. All fuses shall
3.3.2 Steel parts. Unless otherwise speci-
be clearly marked with arrows noting direc-
fied, all steel parts except those in constant
tion of flow for closing.
contact with hydraulic fluid shall be cadmium
2
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