US 11,708,768 B2
Automated propeller feather testing
Brant Duke, Lasalle (CA); and Kenneth Matheson, Montreal (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Feb. 25, 2022, as Appl. No. 17/680,801.
Application 17/680,801 is a continuation of application No. 16/655,424, filed on Oct. 17, 2019, granted, now 11,286,806.
Application 16/655,424 is a continuation of application No. 14/712,985, filed on May 15, 2015, granted, now 10,487,682, issued on Nov. 26, 2019.
Prior Publication US 2022/0243609 A1, Aug. 4, 2022
Int. Cl. F01D 21/00 (2006.01); B64C 11/38 (2006.01); B64C 11/06 (2006.01); B64C 11/30 (2006.01); F01D 7/00 (2006.01); B64F 5/60 (2017.01); B64C 11/32 (2006.01)
CPC F01D 21/003 (2013.01) [B64C 11/06 (2013.01); B64C 11/30 (2013.01); B64C 11/325 (2013.01); B64C 11/385 (2013.01); B64F 5/60 (2017.01); F01D 7/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for testing a propeller pitch angle function, the method comprising:
while propeller blades of an aircraft are rotating about a rotational axis, commanding, by a processor of a computing device, a pitch angle change of the propeller blades;
after said pitch angle change of the propeller blades, measuring a post-angle change rotational speed of the propeller blades;
comparing, by the processor of the computing device, the post-angle change rotational speed of the propeller blades to an expected rotational speed without the commanded angle change; and
issuing, by the processor of the computing device and based on said comparing, one of a test passed signal indicative of a passed pitch angle test and a test failed signal indicative of a failed pitch angle test.