mals-14 r134 ecu testing
DESCRIPTION
MALS-14 R134 ECU Testing. GySgt Ward SNCOIC 990. CWO5 Art LeBlanc AVO. History. Initial Delivery started in May 2008 Current on hand 55 units R134A ECU Failures (19) 2 bad compressors 2 bad indoor blowers 2 leaking Freon from high side - PowerPoint PPT PresentationTRANSCRIPT
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MALS-14R134 ECU Testing
CWO5 Art LeBlancAVO
GySgt WardSNCOIC 990
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• Initial Delivery started in May 2008• Current on hand 55 units• R134A ECU Failures (19)• 2 bad compressors• 2 bad indoor blowers• 2 leaking Freon from high side• 9 outdoor fans contacting outdoor coil/Bracket • 2 outdoor fan motors failed• 1 bad transformer• 1 bad main contactor
History
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ECU Physical Differences
64% Increase in RPM
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Investigation/Bulletin History• SEB 1034 was released in July 2010 requiring
a one time inspection of the indoor fan motor.• Checking for presence of flat point set screws vice knurled cup point set screws.
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• SEB 1047 was released in October 2010 directing an inspection to ensure proper placement of the outdoor fan motor IRT the fan bracket, requiring a distance of 2 ¼” from fan motor to fan mounting
assembly.
Investigation/Bulletin History
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• Snowbird conducted an E.I. in Dec 2010 on MALS-14 asset that met the requirement of SEB 1047 but still suffered failure of the outdoor fan.
Investigation/Bulletin History
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Solution• After extensive research by Snowbird, two prototypes
were released for testing trials in Jan. 2011.• Units were delivered and installed @ MALS-14.
Heavier duty bracket
Steel, heavier duty fan
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Results• One unit has ran with no problems for almost
180 days +.• One unit suffered a outdoor lower fan motor loss
after approximately 110 days.– LCdr Davis, Snowbird, & MF Program Office
traveled to Ch Pt to install new Fan Motor. No problems since…
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• 2 Catastrophic outdoor fan failures (20 June 2011)
Recent Events & Comments
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• 1 outdoor fan motor failed (shorted to case) on 22 June 2011
Recent Events & Comments
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• Wire routing
Recent Events & Comments
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• Manufactured with sealant used through bulkhead and on motor
Recent Events & Comments
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QUESTIONS ?