![img](MIL-PRF-1895300013im.jpg)
MIL-PRF-18953C(SH)
TABLE III. Test agenda.
Verification Qualification1/ Conformance
Type2/
Periodic3/
Routine4/
Tests
Reqt.
A, L5/
Shock
A, L
A, L5/
Vibration
A, L
ALL
Balance
ALL
ALL
ALL
ALL
ALL
Performance
ALL
ALL
Airborne noise
By measurement
ALL
--
ALL
ALL
By ear
--
ALL
Motor heat
ALL
ALL
ALL
Bearing
ALL
temperature
All with
All with
Explosion
explosion-
explosion-
(explosion-proof
proof motors
proof motors
motors)
All with
All with
Air leakage
explosion-
explosion-
(explosion-proof
proof
proof motors
motors)
motors
A, X-A4/
A, X-A4/
A, X-A4/
Casing tightness
Speed
ALL
ALL
ALL
Blade tip clearance
ALL
ALL
measurement
All non-
All non-
Non-magnetic
magnetic units magnetic units
A
representative
Maintainability
fan size
1/
Applies to test specimen of the types indicated.
2/
Applies to test specimen for each design of each size of the types indicated.
3/
Applies to every fan-motor unit produced.
4/
Casing tightness test is required only when specified.
5/
Required (see 3.1), unless a previous test of a similar unit is considered applicable and is extended by the
qualifying activity.
4.4 Type tests. Type tests are all required tests of fan-motor units of each type and size by producers whose
product of the type being tested is listed in the Qualified Products List. Type tests shall consist of the tests specified
in Table III and shall be conducted prior to production on each new fan-motor unit, unless a previous test of a
similar unit is considered applicable and is extended by the qualifying activity. In general, such extensions will be
granted if the fan-motor unit is of similar construction and the motor is of identical manufacture and of identical
frame size, provided that the heating and speed of all motors shall be determined by heat and speed tests with the
motor installed in the fan.
4.5 Periodic tests. Periodic tests are required to assure continuing satisfactory operation of identical units.
When specified (see 6.2), periodic tests shall consist of the tests specified in Table III.
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