MIL-PRF-24751A(SH)
TABLE IV. Test agenda.
Applicability of test to fan type
First
Conformance
Periodic
Tests
Requirement
Verification
article
Performance
3.14
4.6.1
ALL
ALL
ALL
Aerodynamic Stall
3.14.2 & 3.14.3
4.6.2
ALL
ALL
ALL
Airborne noise
3.15.3
4.6.3
ALL
--
ALL
Noise measurement by ear
3.15.3
4.6.3.5
--
ALL
Balance
3.15.2
4.6.4
ALL
ALL
Vibration
3.15.2
4.6.5
Casing tightness
3.12.1
4.6.6
ALL
--
Speed
3.13.1.2
4.6.7
--
--
ALL1/
Shock
3.15.1
4.6.8
--
Motor temperature
3.13.1.1
4.6.9
ALL
ALL
ALL
Bearing temperature
3.13.1.5
4.6.10
ALL
--
Blade tip clearance
3.11.1
4.6.11
ALL
ALL
measurement
ALL2/
Nonmagnetic
3.2.3
4.7
-
ALL
-
Maintainability
3.9
4.8
3/
3/
Notes:
1/
Unless otherwise specified in 6.2.
2/
Only if required by 6.2.
3/
First production sample.
4.4 Periodic conformance inspection. Periodic tests are required to assure continuing satisfactory operation of
identical units. The tests are required under any contract or purchase order for fans of existing design when the
invitation to bid is dated 4 years or more subsequent to the date of the last previous test of an identical unit. Periodic
tests shall consist of the tests specified in Table IV.
4.5 Material and dimensional examination.
4.5.1 Cast impeller casing. If a cast impeller is used, repairs are not permitted. Cast casing may be repaired by
welding or impregnation if completed in accordance with the requirements of NAVSEA Technical Publication
S9074-AR-GIB-010/278.
4.5.2 Fabricated casing. Casing shall be visually examined for defects. Cracks may be repaired by welding.
4.5.3 Dimensional examination. Dimensions, horsepower, and weight shall not exceed limits of Table I.
4.6 Tests. Tests shall be conducted in accordance with 4.6.1 through 4.6.12.
4.6.1 Performance. Performance tests shall be conducted in accordance with AMCA 210. Any of the test
stands that utilize nozzles as a flow-measuring device may be used.
4.6.2 Aerodynamic stall. The effective stall capacity shall be determined from the largest capacity
measurement of the following three stall measurement methods.
4.6.2.1 Throttled stall capacity. This method is capacity at which the fan goes into stall when slowly throttling
the discharge with the fan operating.
10
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