PS Magazine - JULY 1973
PS, The Preventative Maintenance Monthly
1973 SERIES, ISSUE 248
JULY 1973
1±
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:i
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Once a King, always a King. Once
a Knight is enough. A day, anyway±
Never
use
the
indicator
push-
to²test button on your Chinook ISIS
rotor blades more than once on the
f
DaiLy, bird mechs.
³f you do, yoU'll lose the vacuUm
·
sooner than expected. The resul´ will
µ be more FeqUent bla¶e changes·
¸act is, you get about 400 tests out
±
of the new integral spar inspEction
1
system.
But it beats pulling the old
time²consuming borescope and eddy
current inspections by a mile.
Air within the modi¹ed blades is
evacuated from the blade spaR
´hroUgh an air valve, untºl the inter»
naL sp¼r pressure is aboUt
l
PS³A .
.
,
-
²
:
64
If a crack shoULd develop in the
spar, or socket, the bLa½e loses its
vacuum. The visual i¾dºcator will
tHen show alternating black and
white stripes. You have an unsa¿
bla½e. When that happens stable
Àour Charger Ár a new bLade.
ÂURE, yoUÃÄÄ lÅÆe ¼ lº´´ÇE V¼ÈUUM
EvERÀ ´ºME yÅU ÉUÆÊ ´ÊE ËU´´ÅÌ Å¾
in½ºca´År, P/Í Î 14ÏS1ÐÐÑÎ, ÒÂÍ
6685Ñ486Ó9ÐÐ6Ô Ío sÕe¼´ ºf ÀoU ȼÌ
ge´ hol½ of ÖL¼deÆ Õi´Ê ´hE ºMÉRovE½
ºn½ºca´or, P/Í Î 14ÏS1ÐÐ×2, ÒÂØ
_ ±².
6685×Ð9ÐÑ8912. No ¼ºr e¾´ERÆ ´hE
Ëla½e when ÀoU ´eÆ´ ´Êe ¾EÕ Ñ2
i¾½ºc¼´oR.
ÙCoURÆe, whe¾ ÀoU pUsÊ ´he ËU´´o¾ tÊE º¾½Úȼ´ÅR ÕÚÄÄ ÆÊÅÕ Ël¼ÈÛ ¼Ì½
white s´riÉeÆ (U¾Æ¼fe). Ühe¾ yoU REÄEaÆE ´ÊE ËU´´o¾ ´ÊE º¾½ºc¼´oR ÆÊÅUĽ
re´UR¾ ´Å all Õhº´E Æ´RºpEs (safE)Ý
ÞhE ÕEºGÊt of ´hE ISIS Ël¼½Es ºs º¾ÈRE¼ÆE½ ÅVER ´hE ¾Å¾×ßÂß ´ÀÉàá
so ÌeveR mºX âeM o¾ ´he Ro´oR ÊE¼½ of yoUR ´RUÆ´À Æ´Eà½ã
±5
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