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
