MIL---DTL---51194D(EA)
3.2 Airflow res is tance. T h e re sista n ce to a irflo w sh a ll be n o gre a te r th a n 1.25 in ch e s o f wa -
te r ga ge (iwg) a t a n a irflo w ra te o f 20 cu bic fe e t p e r min u te (cfm) a t sta n d a rd co n d itio n s (70° F
a n d 1013 mba r).
3.3 Filtration efficiency. T h e filte r sh a ll be n o le ss th a n 99.97% e fficie n t in th e re mo va l o f
a e ro so ls with a me a n d ia me te r o f 0.3 micro n s.
3.4 Res is tance to rough handling. T h e filte r sh a ll me e t a irflo w re sista n ce , filtra tio n e fficie n -
cy, a n d a ir le a ka ge re q u ire me n ts a fte r ro u gh h a n d lin g fo r 15 min u te s a t a n a mp litu d e o f 3/4 in ch
with th e filte r fa ce , p le a ts, a n d se p a ra to rs in a ve rtica l p o sitio n .
3.5 Air leakage. Air le a ka ge (in a n d a ro u n d ga ske t a re a ) sh a ll be n o t gre a te r th a n 0.91 cu bic
in ch e s p e r min u te wh e n th e filte r is in te rn a lly p re ssu rize d to a p re ssu re o f n o t le ss th a n 12 in ch e s
o f wa te r.
3.6 Workmans hip. T h e filte r sh a ll be fre e fro m ch ip p e d , bu rre d , o r be n t me ta l se ctio n s a n d
lo o se o r d a ma ge d ga ske ts; fo re ign ma tte r, su ch a s o il o r visco u s su bsta n ce s, a n d rip s, te a rs, o r
h o le s in th e filte rin g me d iu m.
3.7 Firs t article. W h e n sp e cifie d (se e 6.2), a sa mp le o f filte rs sh a ll be su bje cte d to first a rti-
cle in sp e ctio n in a cco rd a n ce with 4.2.
4. VERIFICATION
4.1 Clas s ification of ins pections . T h e in sp e ctio n re q u ire me n ts sp e cifie d h e re in a re cla ssi-
fie d a s fo llo ws:
(a ) F irst a rticle in sp e ctio n (se e 4.2)
(b) Co n fo rma n ce in sp e ctio n (se e 4.3)
4.2 Firs t article ins pection.
4.2.1 Sample. T h e first a rticle sa mp le sh a ll co n sist o f 20 p a rticu la te filte rs ma n u fa ctu re d
u sin g th e sa me me th o d s, ma te ria ls, e q u ip me n t, a n d p ro ce sse s a s will be u se d d u rin g re gu la r
p ro d u ctio n . T h e first a rticle sa mp le sh a ll be su bmitte d fo r in sp e ctio n a n d a p p ro va l in a cco r-
d a n ce with th e te rms o f th e co n tra ct.
4.2.2 Ins pections to be performed. As d e te rmin e d by th e G o ve rn me n t, th e sa mp le first a r-
ticle ite ms ma y be su bje cte d to a n y o r a ll o f th e e xa min a tio n s a n d te sts sp e cifie d in th is sp e cifica -
tio n a n d be in sp e cte d fo r co mp lia n ce with a n y o r a ll o f th e re q u ire me n ts o f th e a p p lica ble
d ra win gs.
4.2.3 Acceptance criteria. If a n y first a rticle sa mp le ite m fa ils to co mp ly with a n y o f th e
a p p lica ble re q u ire me n ts, th e first a rticle sa mp le sh a ll be re je cte d . T h e G o ve rn me n t re se rve s
th e righ t to te rmin a te in sp e ctio n u p o n a n y fa ilu re to co mp ly with a n y o f th e re q u ire me n ts. T h e
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