Fri, Nov 30, 2018
Check Valves Failed On Three Aircraft
The FAA is aware of three events involving failure of check valve part number C100490-1, Item No. 82 of Figure 03 in the Illustrated Parts Catalog Rev. 23 involving the oil system “Valve – Flap Check” on serial numbers 208B2197 and 208B5000 and on. These airplanes are commonly referred to as “208B EX” or “EX” and incorporate the Textron PT6A-140 engine installation.
The FAA found no other reports of this type of event in the accident/incident databases.
All failures resulted in parts of the check valve assembly being liberated and entering the engine oil system. The failure of the oil system check valve is a latent failure condition which may exist on any airplane. Indications the failure has occurred are increasing oil temperatures in to the caution and warning range due to blockage in the oil system. Please note; the check valve is shown in the 208/208B Maintenance Manual, Rev. 34, Chapter 79-20-05 Figure 202, Sheet 1, View BB, however it is misidentified as the “OIL TUBE UNION” which is located in the upper center of View B-B.
The FAA recommends the following actions:
- Be aware of this failure which may be indicated by higher than normal oil temperatures, steadily increasing oil temperatures, or operation into the yellow caution advisory and red warning ranges of the oil temperature indicator.
- Replace any P/N C100490-1 check valve with 1800 hr. time in service or greater, on any engine, until further investigation has been conducted.
- Return any check valve removed for any cause to Textron Aviation Customer Service.
(Image from file)
More News
With Testing Soon Complete, Launch Preparations Begin in Earnest Sierra Space's Dream Chaser has been put through the wringer at NASA's Glenn Armstrong Test Facility in Ohio, but w>[...]
Takeoff Roll The process whereby an aircraft is aligned with the runway centerline and the aircraft is moving with the intent to take off. For helicopters, this pertains to the act>[...]
“We’re proud of the hard work that went into receiving this validation, and it will be a welcome relief to our customers in the European Union. We couldn’t be mor>[...]
"Aircraft Spruce is pleased to announce the acquisition of the parts distribution operations of Wag-Aero. Wag-Aero was founded in the 1960’s by Dick and Bobbie Wagner in the >[...]
IDENT Feature The special feature in the Air Traffic Control Radar Beacon System (ATCRBS) equipment. It is used to immediately distinguish one displayed beacon target from other be>[...]