US 11,753,972 B2
System and method for annunciating engine lubricating fluid level
Michael Hanna, Beaconsfield (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Jan. 18, 2021, as Appl. No. 17/151,362.
Prior Publication US 2022/0228518 A1, Jul. 21, 2022
Int. Cl. F01M 11/12 (2006.01); B64D 43/00 (2006.01); B64D 45/00 (2006.01); B64D 47/02 (2006.01)
CPC F01M 11/12 (2013.01) [B64D 43/00 (2013.01); B64D 45/00 (2013.01); B64D 47/02 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An engine lubricating fluid level annunciation system comprising:
a first fluid level sensor for a first engine;
a first low-level detector coupled to the first fluid level sensor;
a first low-level indicator coupled to the first low-level detector for annunciating a fluid level of the first engine below a minimum operating level; and
an annunciation and display system coupled to the first low-level detector and configured for performing non-critical lubricant-related functions;
the first fluid level sensor, the first low-level detector, and the first low-level indicator composed of first components having a critical level of reliability meeting requirements for Design Assurance Level (DAL) A of Design Assurance Guidance for Airborne Electronic Hardware, the annunciation and display system composed of second components having a non-critical level of reliability meeting requirements for DAL B or DAL C.