Fire Detection System - Contamination of the sensor contacts for Advanced Pneumatic Detectors (APD) System
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Bombardier DHC-8-400 series aircraft must conduct on-wing tests of the APD system within 8000 flight hours or 48 months from April 18, 2019, whichever comes first, following Bombardier Service Bulletin 84-26-19. Installation of affected APDs without proper re-identification is prohibited from the effective date. Compliance with these actions is mandatory to continue safe operations.
Summary
The Canadian Airworthiness Directive CF-2019-13 addresses contamination issues in the sensor contacts of Advanced Pneumatic Detectors (APD) installed on Bombardier DHC-8-400 series aircraft, including models -400, -401, and -402. This directive applies to specific Kidde (UTAS) APD part numbers and serial numbers. It mandates inspection and potential replacement of affected APD units to ensure proper fire detection system functionality.
What changed
CF-2019-13 introduces a new requirement to inspect the APD pressure switches for contamination that could delay or prevent fire alarm activation. It requires operators to perform on-wing tests and prohibits installation of non-compliant APDs without re-identification as per Bombardier Service Bulletin 84-26-19. This is a new regulation addressing a manufacturing quality issue.
Why it matters
This directive is critical for aviation professionals because contamination in APD sensor contacts can lead to delayed or failed fire detection, posing significant safety risks. Operators and maintenance teams must ensure compliance to maintain aircraft airworthiness and safety. Timely detection and replacement of affected parts prevent unsafe flight operations and regulatory non-compliance.
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