# SAIB AIR-21-15: Navigation System - Type: Special airworthiness information bulletin (advisory, not mandatory) - Status: Historical - Revision: 0 - Issued: August 26, 2021 - Products: 328 Support Services 328-100, 328-300, BD-700-1A10, BD-700-1A11, BD-700-2A12, CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), CL-600-2B16 (CL-601-3A), CL-600-2B16 (CL-601-3R), CL-600-2B16 (CL-604), 45, 500 and 27 more - Product type: Aircraft, Large Airplane - PDF: https://openairdocs.org/files/sha256/ca/7f/ca7f2226d8355b623f1cdc5d63ac391ba80bec6796adad9cd1f119c77fad311e - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C3A3FEE40A5D54178625873D0066838B.0001 - DRS record last changed: August 26, 2021 - Page: https://openairdocs.org/saib/AIR-21-15 ## Text FAA Aviation Safety **SPECIAL AIRWORTHINESS** INFORMATION BULLETIN SUBJ: Navigation System SAIB: AIR-21-15 Date: August 26, 2021 This is information only. Recommendations aren’t mandatory. Introduction This Special Airworthiness Information Bulletin advises owners and operators of 328 Support Services GmbH Model 328-100 and -300 airplanes; Learjet, Inc., Model 45 airplanes; Yaborã Indústria Aeronáutica S.A. Model EMB-135ER, EMB-135LR, EMB-135BJ (Legacy 600), EMB-135KE, EMB-135BJ (Legacy 650), EMB-135KL, EMB-145, -145ER, -145MR, -145LR, - 145XR, -145MP, and -145EP airplanes; Textron Aviation Inc. Model 500 550 S550 552 560 and 560XL airplanes, Model 501 and 551 airplanes, Model 650 airplanes, and Model Hawker 800 (including variant U-125A), 800XP, and 1000 airplanes; Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes; Bombardier, Inc., Model BD-700-1A10, BD-700-1A11, and BD-700-2A12 airplanes; Viking Air Limited Model CL-215-6B11 (CL-415 Variant) airplanes; and Textron Aviation, Inc., Model 750 airplanes; having a Honeywell Primus II Radio System with Radio Management Unit (RMU) 855 installed, of the potential for inadvertent disabling of the Automatic Dependent Surveillance – Broadcast (ADS-B) Out function. At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39. Background The FAA received reports in January and February 2020 of ADS-B Out compliant aircraft on which ADS-B Out transmissions were not operating. The cause of this was due to certain avionics power up sequences involving the RMU-855. The crew could be unaware of this issue unless informed of it by Air Traffic Control (ATC). Honeywell has identified different airplanes with this equipment, totaling approximately 2,750 affected airplanes. This condition results in failure to comply with 14 CFR 91.225 and 14 CFR 91.227 when ADS-B Out is disabled and the aircraft operates in the airspace defined in 14 CFR 91.225. Honeywell Service Bulletin 7013270-34-0024, dated December 19, 2019, and Honeywell Service Information Letter D201507000061, Revision 4, dated April 6, 2021, have been issued to provide procedures for ensuring power up sequencing in the integrated radio system, and accomplishing a software update at authorized repair stations. Recommendations The FAA recommends that all owners and operators of the airplanes identified above incorporate the actions outlined in the referenced service information at the earliest opportunity. 2 For Further Information Contact Charles Toliver, Aerospace Engineer, Systems and Equipment Section, Los Angeles ACO Branch, 3960 Paramount Blvd , Lakewood, CA 90712-4137, telephone: 562-627-5367; e-mail Charles.Toliver@faa.gov. ## Registered aircraft it may concern (OpenAirDocs) Registry models matched by make and model, the same way as ADs, most registered aircraft first. - [Cessna 560](https://openairdocs.org/model/cessna-560): 596 registered aircraft (airframe model) - [Cessna 560XL](https://openairdocs.org/model/cessna-560xl): 585 registered aircraft (airframe model) - [Cessna 550](https://openairdocs.org/model/cessna-550): 500 registered aircraft (airframe model) - [Learjet 45](https://openairdocs.org/model/learjet-45): 433 registered aircraft (airframe model) - [Bombardier CL-600-2B16](https://openairdocs.org/model/bombardier-cl-600-2b16): 388 registered aircraft (airframe model) - [Bombardier BD-700-1A10](https://openairdocs.org/model/bombardier-bd-700-1a10): 372 registered aircraft (airframe model) - [Cessna 750](https://openairdocs.org/model/cessna-750): 273 registered aircraft (airframe model) - [Raytheon HAWKER 800XP](https://openairdocs.org/model/raytheon-hawker-800xp): 251 registered aircraft (airframe model) - [Embraer EMB-145LR](https://openairdocs.org/model/embraer-emb-145lr): 204 registered aircraft (airframe model) - [Cessna 650](https://openairdocs.org/model/cessna-650): 201 registered aircraft (airframe model) - [Cessna 501](https://openairdocs.org/model/cessna-501): 189 registered aircraft (airframe model) - [Bombardier BD-700-1A11](https://openairdocs.org/model/bombardier-bd-700-1a11): 149 registered aircraft (airframe model) - [Textron 560XL](https://openairdocs.org/model/textron-560xl): 141 registered aircraft (airframe model) - [Bombardier BD-700-2A12](https://openairdocs.org/model/bombardier-bd-700-2a12): 137 registered aircraft (airframe model) - [Canadair CL-600-2B16](https://openairdocs.org/model/canadair-cl-600-2b16): 134 registered aircraft (airframe model) - [Embraer EMB-145XR](https://openairdocs.org/model/embraer-emb-145xr): 98 registered aircraft (airframe model) - [Cessna S550](https://openairdocs.org/model/cessna-s550): 94 registered aircraft (airframe model) - [Cessna 500](https://openairdocs.org/model/cessna-500): 62 registered aircraft (airframe model) - [Embraer EMB-135BJ](https://openairdocs.org/model/embraer-emb-135bj): 48 registered aircraft (airframe model) - [Bombardier CL-600-2B16(CL-604)](https://openairdocs.org/model/bombardier-cl-600-2b16-cl-604): 42 registered aircraft (airframe model) - [Cessna 551](https://openairdocs.org/model/cessna-551): 34 registered aircraft (airframe model) - [Embraer EMB-135KL](https://openairdocs.org/model/embraer-emb-135kl): 31 registered aircraft (airframe model) - [Embraer EMB-135LR](https://openairdocs.org/model/embraer-emb-135lr): 29 registered aircraft (airframe model) - [Raytheon Corporate Jets HAWKER 800XP](https://openairdocs.org/model/raytheon-corporate-jets-hawker-800xp): 23 registered aircraft (airframe model) - [Canadair CL-600-2A12](https://openairdocs.org/model/canadair-cl-600-2a12): 19 registered aircraft (airframe model) - [Dornier Luftfahrt 328-100](https://openairdocs.org/model/dornier-luftfahrt-328-100): 19 registered aircraft (airframe model) - [Textron 750](https://openairdocs.org/model/textron-750): 15 registered aircraft (airframe model) - [Fairchild Dornier DORNIER 328-300](https://openairdocs.org/model/fairchild-dornier-dornier-328-300): 11 registered aircraft (airframe model) - [Embraer EMB-135ER](https://openairdocs.org/model/embraer-emb-135er): 10 registered aircraft (airframe model) - [Raytheon Corporate Jets HAWKER 800](https://openairdocs.org/model/raytheon-corporate-jets-hawker-800): 9 registered aircraft (airframe model) - [Raytheon Corporate Jets HAWKER 1000](https://openairdocs.org/model/raytheon-corporate-jets-hawker-1000): 8 registered aircraft (airframe model) - [Dornier 328-300](https://openairdocs.org/model/dornier-328-300): 7 registered aircraft (airframe model) - [Embraer EMB-145](https://openairdocs.org/model/embraer-emb-145): 7 registered aircraft (airframe model) - [Canadair CL-215-6B11(CL-215T)](https://openairdocs.org/model/canadair-cl-215-6b11-cl-215t): 6 registered aircraft (airframe model) - [Canadair CL-600-1A11](https://openairdocs.org/model/canadair-cl-600-1a11): 5 registered aircraft (airframe model) - [Bombardier CL-215-6B11 (CL-415)](https://openairdocs.org/model/bombardier-cl-215-6b11-cl-415): 4 registered aircraft (airframe model) - [Embraer EMB-145EP](https://openairdocs.org/model/embraer-emb-145ep): 4 registered aircraft (airframe model) - [Fairchild Dornier 328-100](https://openairdocs.org/model/fairchild-dornier-328-100): 4 registered aircraft (airframe model) - [Canadair CL600-2B16(CL601-3A)](https://openairdocs.org/model/canadair-cl600-2b16-cl601-3a): 3 registered aircraft (airframe model) - [Dornier Luftfahrt DO 328-100](https://openairdocs.org/model/dornier-luftfahrt-do-328-100): 3 registered aircraft (airframe model) - [Beech 45](https://openairdocs.org/model/beech-45): 2 registered aircraft (airframe model) - [Canadair CL600-1A11](https://openairdocs.org/model/canadair-cl600-1a11): 2 registered aircraft (airframe model) - [Dornier Luftfahrt DORNIER 328-300](https://openairdocs.org/model/dornier-luftfahrt-dornier-328-300): 2 registered aircraft (airframe model) - [Bombardier Aerospace BD-700-1A10](https://openairdocs.org/model/bombardier-aerospace-bd-700-1a10): 1 registered aircraft (airframe model) - [Bombardier Aerospace CL-600-2B16 (CL-604)](https://openairdocs.org/model/bombardier-aerospace-cl-600-2b16-cl-604): 1 registered aircraft (airframe model) - [Bombardier CL-600-2A12](https://openairdocs.org/model/bombardier-cl-600-2a12): 1 registered aircraft (airframe model) - [Bombardier CL600-2B16 (CL601-3A](https://openairdocs.org/model/bombardier-cl600-2b16-cl601-3a): 1 registered aircraft (airframe model) - [Canadair Bombardier CL-600-2B16](https://openairdocs.org/model/canadair-bombardier-cl-600-2b16): 1 registered aircraft (airframe model) - [Canadair CL-600-2A12(CL-601)](https://openairdocs.org/model/canadair-cl-600-2a12-cl-601): 1 registered aircraft (airframe model) - [Dornier Luftfahrt 328-300](https://openairdocs.org/model/dornier-luftfahrt-328-300): 1 registered aircraft (airframe model) All 63: https://openairdocs.org/saib/AIR-21-15/models.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.