AD/AIRCON/12 Amdt 5 Hartzell Engine Technologies, Kelly Aerospace Power Systems, and Janaero Devices - Cabin Combustion Heaters (Cth)

AIRWORTHINESS DIRECTIVE On the commencement date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/AIRCON/12 Amdt 4 and issues the following AD under subregulation 39.001 (1) of CASR and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Airconditioning Equipment AD/AIRCON/12 Amdt 5 Hartzell Engine Technologies, Kelly Aerospace Power Systems, and Janaero Devices - Cabin Combustion Heaters 20/2019

Applicability: This AD applies to Hartzell Engine Technologies, Kelly Aerospace Power Systems and Janaero Devices Combustion Heaters, B-Series Models B1500, B2030, B3040, B4050 and B-Series Extended Life (EL) Models B2500, B3500 and B4500, marked as meeting the standards of FAA TSO-C20, and fitted to an aircraft. Requirement: 1. INSPECTION All of the following action must be taken: (a) inspection of the combustion heater installation, including any airframe mounted components necessary for heater operation, for general condition and security; (b) inspection of the hot air outlet ducting adjacent to the heater for freedom from exhaust contamination and corrosion; (c) cleaning the heater fuel filter (if installed), (d) checking the heater fuel system for loose connections and leaks using system pressure; (e) inspection of the heater drain lines for freedom from obstructions; (f) inspection and adjustment of spark plugs and contact breaker points where necessary, in accordance with the manufacturer's published instructions. 2. PRESSURE TEST (1) At least 1 of the following actions must be taken: (a) a pressure decay test of the combustion heater in accordance with the instructions contained in Janitrol Aircraft Heaters – Overhaul and Maintenance Manual part number (P/N) 24E25-1 (for the B-Series (standard) units), and P/N 94E47 (for the B-Series (EL) units) as in force from time to time; or (b) a functional check of the combustion heater during which the carbon monoxide (CO) level in the heated air entering the cabin is measured. Quantitative CO must be used and the CO level entering the cabin must be less than 1 part in 20 000 parts of air (equivalent to 50 parts per million).