If you have difficulties such as the issue reported in this thread remember to use the standard (official) process detailed on page 17-1 in the current maintenance manual. The data is valuable in determining if changes need to be made.
The preferred method of reporting Pasted below
Include your name and builder/serial #, flight hrs at the time of the problem was discovered, which spring(s) broke and where the break occurred (if any portion of the spring was still attached to the carb.), and any other details that you think might be relevant. Also please include details regarding the following to better help with the investigation.
1. Report whether checks have been made to confirm there is no more than .1 degree difference in pitch between the two propeller blades.
2. Report whether a dynamic propeller balance has been done.
3. Confirm that the carb. sync procedure has been properly completed within the previous 100 hrs using vacuum gauges.
4. Report whether the airplane is operated for extended periods in a rough rpm band. (Many 912s seem to run rough in the 2500-3500 range, sometimes to the extent of shaking the carbs enough to even vary the mixture and compounding the problem.)
5. Report whether the engine is idled below 1800 RPM (other than for a few moments during startup and shut down) for extended periods.
FEEDBACK
To maintain the highest level of safety the FAA requires and Van?s Aircraft Inc. requests notification of any safety of flight issue, service or maintenance difficulty that could compromise airworthiness of the RV-12 aircraft. A feedback form is provided in the Supplement section of this manual.
(It is also available
A valuable description will include:
? Specific flight condition if applicable.
? List of the parts identified as affected by the anomaly.
? Description of the apparent condition of the parts prior to the anomaly (de-burred,
primed, modified, etc.)
? Statement as to whether the aircraft has remained within the operating limitations defined in the POH.
? Brief description of the type and frequency of aircraft use (may include; runway conditions, flying conditions, storage methods, etc.)
REPORTING METHODS
Mail to:
ATTN: RV-12 Safety Alert
Van's Aircraft, Inc.
14401 Keil Road, NE
Aurora, OR 97002 USA
Fax to:
'RV-12 Safety Alert' (on cover page)
503.678.6560
Hours: 24 hours per day
E-mail to:
'RV-12 Safety Alert' (in subject line)
[email protected]