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HomeAircraftHelicopterAlignT-REX 600N › Engine Fan Mount / Fan
01-12-2009 04:11 PM  9 years agoPost 1
JaDragon

rrNovice

Kingston, Jamaica W.I.

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Sorry new to this never meant to close Topic.

Hi All just for info, my friend had this experience on his 600N yesterday. Heli flew a tank and landed in one piece except to follow. Not sure if anyone has had this happening. Metal fan sheared the two smaller of four fan supports on the engine fan mount. You can peruse the photos and draw your deductions, Fan was held to mount by one screw. The GV1 sensor could have been rubbing all along and caused the screws to loosen, then it jammed momentarily in the fan shroud,(which has evidence of rubbing, not much), shearing the brackets. Before flight heli made sounds like engine bearing was going, on landing... alot of noise, situation was not evident until strip down. Plug was shot as well when it shutdown by itself. There was no signs of this pending failure ie black powder from shroud. So check gap on sensor to fan, use required locktite(Blue) on screws. Hope this will be of help for future rebuilds and your regular maintenance checks.

Push Pitch Everytime, No Problem

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01-12-2009 05:54 PM  9 years agoPost 2
lfalsetto

rrKey Veteran

COLORADO

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I had a fan explode in flight if that is any consolation

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01-12-2009 07:07 PM  9 years agoPost 3
Ironhide

rrVeteran

dexter mi us

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Just my 2 cents but it looks to me the longer bolts /screws were over torqued .That and was the fan balanced ? Over torque and a bad vib will get you to the ground in a hurry . Remember tight not too tight .Just my 2 cents tho .

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01-12-2009 10:18 PM  9 years agoPost 4
bondo

rrNovice

British Columbia

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I noticed an issue when I install my metal fan to the hub. The fan had no chamfer on the ID where the hub fits into. The small radius on the hub at the mounting points would not allow the hub to sit completely flush with the fan. This could be your problem?

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01-13-2009 03:46 AM  9 years agoPost 5
swasey1982

rrApprentice

La Ceiba, Honduras

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holy crap, man thats some damage.

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HomeAircraftHelicopterAlignT-REX 600N › Engine Fan Mount / Fan
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