I’m going to take this opportunity to answer some questions that I get asked on a frequent basis in regards to RVSM pitot probe alignment inspections on aircraft that have the Bombardier STC solutions installed.
The special tooling that is required to inspect the probe alignment is calibrated. Duncan Aviation cannot rent or loan these tools out. Therefore a technician will have to be dispatched along with the tool. This is a Repair Station regulation that cannot be waived.
The Probe Alignment Data Form is filled out during the alignment check. The first three sections are pretty straight forward requiring the probe information, pitch and then roll measurements. Most of the questions that I get begin with section four, the yaw section. Follow these simple steps:
For the 30 series, the “Yaw Variance Distance” will be no larger than .155 (+ or -) to be within tolerance.
For the 55 aircraft, the “Yaw Variance Distance” will be no larger than .100 (+ or -) to be within tolerance.
On the 30 series aircraft, the pitot probes have a nominal yaw angle of -9.70°, while the 55 aircraft have a nominal yaw angle of -11.50°. Not only are the nominal angles different, but the allowable misalignment is different also. The 30 series aircraft have +/- 1.50°, while the 55 has +/- 1.00°.
Keep in mind the above only applies to those aircraft that have the Bombardier RVSM STC’s installed. Those aircraft with different STCs or Service Bulletins installed have varying inspection criteria and techniques.
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