EASA SIB CASA-2019-04
Pratt & Whitney Canada PT6B-37A Engines - Compliance with AD CF-2019-05
Summary
The document titled 'Pratt & Whitney Canada PT6B-37A Engines - Compliance with AD CF-2019-05' is a Civil Aviation Safety Alert issued by Transport Canada. It addresses the mandatory replacement of fuel control units on Pratt & Whitney Canada PT6B-37A engines installed on Leonardo A119 and AW119MKII helicopter models. The alert informs operators and maintainers about the upcoming compliance deadline for Airworthiness Directive CF-2019-05.
What Changed
Airworthiness Directive CF-2019-05, issued on 19 February 2019, mandates the incorporation of P&WC Service Bulletin PT6B-72-39107R1 to replace certain fuel control units on affected engines. This directive introduces a compliance deadline of 19 August 2019 for replacing fuel control units that have been in service for more than six years since new or last overhaul. The alert highlights that the incorporation rate is below expectations, potentially limiting availability of modified units for last-minute replacements.
Why It Matters
This directive is critical for maintaining the safety and airworthiness of helicopters equipped with PT6B-37A engines by addressing a potentially unsafe condition related to fuel control units. Operators, maintenance organizations, and compliance teams must ensure timely replacement to avoid safety risks and regulatory non-compliance. Failure to comply by the deadline could lead to operational restrictions or safety incidents.
What To Do
Operators should review Pratt & Whitney Canada Service Information Letters PT6B-052 and PT6B-055 and follow their recommendations. They must replace fuel control units in accordance with AD CF-2019-05 by 19 August 2019. Alternative means of compliance may be considered only if they maintain an equivalent level of safety and comply with Canadian Aviation Regulation 605.84(4).