Cessna: 421B; Malfunctioning Heater Fuel Pump; ATA 2140

Cessna: 421B; Malfunctioning Heater Fuel Pump; ATA 2140

“The pilot reported the heater had stopped during flight,” states this mechanic. “After returning to the maintenance shop the heater was troubleshot and inspected. We found the heater fuel pump had malfunctioned and had caught on fire for (an undetermined) time. We were able to say it was on fire because of the burn marks on the outside of the pump housing. I have enclosed 2 photographs to show this. (One is shown below.)

I contacted C&D Associates to ask about this problem and I was told that they know about this and (they) have talked with the pump manufacturer Genuine Facet Corporation (about designing) a new style pump. C&D Associates Inc. says the problem is with the Parker Fuel Regulator in the wings on the Cessna 400 series. The regulators seem not to allow enough fuel to go through to keep the pumps operating correctly—allowing them to overheat and fail.”
(The picture has been compressed vertically.)

Part Total Time: 53.0 hours.

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