MIL-PRF-49169B(CR)
3.8. Operational life (reliability). Over an accelerated operational life test of 500 hours when
operated at a bias level of 4.0 Vdc and in a +50° C temperature environment, the average radiant
power output of the diodes of the LED module shall not decrease by more than 20%. In addition,
the LED module shall meet the tracking requirements of 3.6.4 after 500 hours of accelerated
operational life testing. The 500-hour accelerated operational life demonstrates a MTBF of at
least 6,804 hours.
3.9 Nameplates and product marking. The LED module shall be marked for identification and
reference designation by the contractor with the following: CAGE CODE; DRAWING #;
Contract #; Serial Number; and Manufacturer's CAGE CODE.
3.10 Workmanship, Standards of. Workmanship shall be such that components will meet all
requirements of this specification and any referenced drawings when inspected in accordance with
Section 4. The equipment shall be fabricated in such a manner as to be uniform in quality and
shall be free from defects that will affect their life, serviceability, interchangeability, or appearance.
MIL-HDBK-454 may be used as guidance.
3.11 Definitions.
3.11.1. Element. An element is defined as any one of the 180, 120, or 90 light-emitting diodes of
the LED module.
3.11.2. Array. An array is defined as a single line of 180, 120, or 90 elements arranged in the
configuration shown on its respective drawing.
3.11.3. Shape defect. A shape defect of an individual element, measured when energized, is
defined as an emitting area which varies by more than ±15% of the specified area or a length
which varies by more than ±5% of the specified length as defined by the drawings (see 3.2).
3.11.4. Damage. Breakage, loosening, shifting, evidence of corrosion, or failure of any finish,
hardware, connection, or component; and any degradation of LED module performance to values
less than specified herein.
4. VERIFICATION
4.1. Classification of inspections. Inspections shall be classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.4).
4.2. First article inspection. When specified in the contract, the first article inspection shall be
performed by the contractor on a minimum of 6 sample units.
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