Fuel Cells And Bladders


Beechcraft 58P Pressurized Baron

Drain Nipple Debonding

Newly manufactured inboard leading edge tank was installed nine months earlier, replacing OEM p/n 60-921057-3. Low point drain nipple internal reinforcement debonded, allowing complete draining of left wing fuel load. Aircraft was on ground at time of incident. Recommend manufacturing process be reviewed.

Part total time: 55.0 hours

Beechcraft F90 King Air

Inadequate Nipple Bonding

Right wing inboard box fuel cell leaking after 12 months since new. Fuel cell removed, found fuel cell material not adhered to interconnect tube nipple due to inadequate bonding.

Part total time: 87.0 hours

Beechcraft 200 Super King Air

Leaking Nipple Flange

Found inboard leading edge fuel cell in right wing leaking at rubber nipple reinforcement flange. This PMA’d fuel cell was installed three months earlier.

Part total time: 26.0 hours

Beechcraft B200 Super King Air

Improper Nipple Bonding

Aircraft arrived with fuel leaking from right wing. Discovered fuel cell leaking from a seam improperly bonded during the manufacturing process. Also discovered one interconnect nipple that was improperly bonded during manufacture.

Part total time: 148.0 hours

Beechcraft 300 Super King Air

Leaking Fuel Bladders

Fuel leak discovered in right wing wheel well. Replaced the right aft box and nacelle fuel bladders. This SDR is submitted due to a trend of numerous B300 fuel bladder leak reports. We believe the leaking bladders are from a bad batch from one manufacturer. Replacement bladders from a different manufacturer have been reliable.

Part total time: 763.0 hours

Diamond DA42 Twin Star

Cracked Spot Welds

During a scheduled inspection, the tech noticed a wet fuel stain under the right auxiliary fuel tank. When the tank was removed, it was found to be cracked around several of the aft spot weld locations on the tank’s lower aft surface.

Part total time: 1504.0 hours

Piper PA-31-350 Navajo Chieftain

Failed Fuel Bladder Seam

A fuel cell seam failed while aircraft was parked on the ramp, emptying the contents suddenly. There were no prior indications of failure noted. There were no indications of improper installation or damage. The fuel followed the main spar into the belly of the aircraft, then out through drain holes, vents and seams in the skin.

Part total time: unknown


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