Now that many aircraft turbine engines are replaced "on condition,± bird
mechs, a good wash job is more important than ever. Even a small amount of
dIrt WilL cause corrosIon and seal failures, leading to an early engine removal²
Engine damage takes place even
before
a Health ³ndicator Test (H³T) s´ows
a drop in performance. That's why the was´ job should be Done at every Phase
Maintenance inspection-more often when youµre operating in dust, sand or
salt¶Laden aIr· TSARCOM messages
UH¸1¹81º09 and AH¶1¶81¶»9 point
o¼t t½at the Tº53 engine s½ould be
cl¾aned every 25 flight¹ho¼rs w½en
yo¼ fly In dusty or sandy condit¿ons²
HER±1²³
Th´ µ¶6·Ll¸¹tS
OF º»W 2 P¼½s¾N¿
CAn cÀÁa Ã
ÄBÅÆ ÇÈD
ÉUÊY 7-53
ËÌGIÍÎ .ÏÐ
gÑÒ ÓÑÔdy
AfteÀ youÁv¾ moved th¾ bIrd to t½¾
wash rack, remove t½e main rotor
tiedown² The blades hav¾ to mov¾
Remove
the
tiedown
freeÂy wþn you motor tÃe engIne, so
make sure you have clearance from
buildings, poles or oth¾r obstrÄctions²
To save t½e battery, wheeL up an
auxiliary power unit (APU)²
Never wash a hot engine because
components can be warped by rapid
temperature cÃanges² Ået the engIne
cool down for
ÕÖ ×eÕØÖ
45 minutes after
flight.
Use a suitable sprayer and make a
mixture
of
1
part
non¹flammable
turbine engine cleaner,
Ù&Ù
3»00, to 4
parÆs water² NSN 6850¶00¶»8»¶7594
will get you a handy 5ºgal can; NSN
6850¶00¹»81¶7597 a 55¶gal dr¼m² The
sprayer nozzl¾ should give you a flow
of 2
ÚÛ
gallons per minute.
R¾move the upper
ÕÜÝ
lower haLves
of t½e particle separator. TÃen, check
the varIable inlet guide Vanes Ço make
sure theyÈre openÉ
Þ9
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