![img](MIL-PRF-1900400011im.jpg)
MIL-PRF-19004B
TABLE
V.
Test agenda.
Applicability of test to fan type
Verifi-
Tests
Requirement cation
First article
Conformance
Periodic
Shock
3.9.1
4.7.1
Type CC
Vibration
3.9.2
4.7.2
Type CC
Balance
3.9.2
4.7.3
All
All
All
Performance
3.17.1
4.7.4
All
All
3.17.2
4.7.4.1
All
All
All
3.17.3
4.7.5
Airborne noise
4.7.5.1
by measurement
4.7.5.5
by ear
Motor
3.16.1.1
4.7.6
All
All
All
temperature
Bearing
3.16.5
4.7.6
All
temperature
All with
Explosion-proof
3.16.7
4.7.7
explosion-proof
motors
motors
3.16.7
4.7.7.1
All with
All with
Air leakage
explosion-proof explosion-
Explosion-proof
proof motors
motors
motors
Casing tightness
3.13.1
4.7.8
All
All
Speed
3.16.4
4.7.9
All
All
Composite
3.2.1
4.8
Representative
material
sample
Permeability
3.2.4
4.9
All non-
All non-
magnetic
magnetic
First
Maintainability
3.8
4.10
Represent-
production unit
ative size
4.6
Material inspection.
4.6.1 Fabricated steel casing. Visual examination for defects is required.
Cracks in the radius of spun flanges or in the welds of welded flanges may be
repaired by welding, after proper preparation, provided that radiographic
inspection of the repaired area is performed. Wall thickness shall be
measured on at least 10 percent of the casing.
4.6.2 Electrical components. The quality requirements of the applicable
components shall be certified by a nationally recognized test laboratory.
4.7 Tests. Tests shall be conducted in accordance with 4.7.1 through 4.9
(see 4.11 and Appendix B).
4.7.1 High-impact shock. The type CC fan-motor unit shall be shock tested on
the medium weight machines as prescribed for type A of MIL-S-901 if its weight
with fixture and mounting bracket exceeds 550 pounds or if the mounting
bracket extends beyond the anvil; otherwise, it shall be shock tested on the
light weight machine as specified for grade A shock of MIL-S-901. Shock test
acceptance shall not be contingent upon the ability of the equipment to
satisfy noise and vibration requirements. Evidence of fragmentation or
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