Airworthiness Directive 2019-08157
one-timeAirworthiness Directives; Northrop Grumman LITEF GmbH LCR-100 Attitude and Heading Reference System Units
What this AD requires
We are adopting a new airworthiness directive (AD) for Northrop Grumman LITEF GmbH LCR-100 Attitude and Heading Reference System (AHRS) units installed on various aircraft. This AD requires removing certain LCR-100 AHRS units from service. This AD was prompted by test results showing loss of or invalid data. The actions of this AD are intended to prevent an unsafe condition on these products.
Which aircraft AD 2019-08157 applies to
Applies to airplanes and helicopters with a Northrop Grumman LITEF GmbH LCR-100 Attitude and Heading Reference System (AHRS) unit installed using analog outputs for primary flight information display or autopilot functions without automatic output comparison. Known-affected aircraft include, but are not limited to: Dornier Model 228-100, 228-101, 228-200, 228-201, 228-202, and 228-212; Learjet Model 31A; Pilatus Model PC12, PC-12/45, PC-12/47; PZL M28 05; Textron/Cessna Model 560XL; Bell Model 407; Bell Model 412 and 412EP; Sikorsky Model S-76A, S-76B, S-76C.
Whether AD 2019-08157 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.