25. Operational Engine HIT / Anti-Ice Check – Accomplish. – W, N, W, W, C
W- Engine anti-ice bleed and start valve malfunction can cause engine flameout.
N- HIT/Anti-Ice checks while operating in adverse conditions (e.g. dust, desert, coastal beach area, dry river beds) may be deferred (maximum of 5 flight hours) until a suitable location is reached.
W- If any part of the engine anti-ice valve check fails, do not fly the helicopter.
W- Do not cycle the anti-ice bleed and start valve more than once. Valve malfunctions can cause engine flameout at low-power settings or during rapoid collective movements. Do not fly the helicopter if TGT rise is less than 30 deg C, switch cycling is required, or the ENG ANTI-ICE ON advisory will NOT go off.
C- A malfunctioning engine anti-ice and engine inlet anti-ice system may result in power losses as much as 40% maximum torque available at 30-minute TGT demands. If any part of the engine inlet anti-ice check fails, do not fly the helicopter.