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Warning horn and MASK indicator. |
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| MIL-F-51539A
2.2 Order of precedence. In the event of a conflict between the text of this document
and the references cited herein, the text of this document takes precedence. Nothing, in this
document, however, supersedes applicable laws and regulations unless a specific exemption .
has been obtained.
3.
REQUIREMENTS
3.1 Materials and co mponents.
3.1.1 Materials. All materials cited on Drawing 5196699 and subsidiary drawings
shall conform to the spec ifications listed thereon and to the specific characteristics set forth
on the drawings.
3.1.2 Components. All components of the filter unit shall conform to the specifications
and drawings listed on Drawing 5-196699 and subsidiary drawings.
3.2 Manufacture and assembly. The filter unit shall be manufactured and assembled in
accordance with Drawing 5-19-6699.
3.3 Performance.
3.3.1 Cycling bumin. The filter unit shall be cycled for a period of 3 hours during
which time the airflow valve shall drive alternately to the fully open and then to the fully
closed position (see 6.3) at a rate of 3 times per minute in response to an air pressure
differential of 25 inches water gage (iwg) when tested in accordance with 4.4.6.2.
3.3.2 Operational characteristics. Prior to and after completion of the cycling bum-in,
the filter unit shall meet the following operational characteristics:
3.3.2.1 Airflow valve closing. The airflow valve shall start to drive closed between 1.2
and 1.7 iwg when tested in accordance with 4.4.6.3(b).
3.3.2.2 Airflow valve opening. The airflow valve shall start to drive open between 1.2
and 1.7 iwg when tested in accordance with 4.4.6.3(c).
3.3.2.3 Warning horn and MASK indicator. The warning horn shall sound and the
MASK indicator shall flash between 0.85 and 1.10 iwg when tested in accordance with
4.4.6.3(c) and 4.4.6.3(d).
3.3.2.4 Fan assembly rotational speed. The fan assembly impeller rotational speed
shall be a minimum of 11,000 rpm when tested in accordance with 4.4.6.3(e).
3.4 First article. When specified (see 6.2), a sample shall be subjected to the first
article inspection in accordance with 4.3.
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