Factual Information 2015:Appendix 1.6E/1.6E.10
This page contains an extract from MH370/01/15 Factual Information which accompanied the (first) Interim Statement released by The Malaysian ICAO Annex 13 Safety Investigation Team for MH370 on 8th March 2015.
1.6E.10 Ice and Rain Protection
Ice and rain protection is carried out on the wings, engine intake, air data probes, cockpit windows, water and waste lines.
The aircraft is fitted with two ice detector probes on each side of the forward fuselage. When ice collects on either detector, a signal is sent to the engine Airfoil Cowl Ice Protection System (ACIPS) card. The engine ACIPS card shares information with the wing ACIPS card. The cards then operate the wing and engine anti ice systems automatically when engine and wing anti ice switches are in auto and the aircraft is in the air. Engine bleed air is used for engine anti ice and wing anti ice functions.
Air Data Probes comprise of three Pitot probes, two Angle of Attack (AOA) probes and one Total Air Temperature (TAT) probe fitted on the forward fuselage. These probes have a built-in heater to prevent icing. The Electric Load Management System (ELMS) controls the level of heating in flight and ground mode.
The cockpit windshield and side windows are heated to prevent ice and fog. There is an in-built electrically resistive material in the window lamination that is electrically heated. Two window heat control units (WHCU) control the level of heating when the window heat switches are turned ON.
The cockpit has a windshield wiper system to remove rain from the LH and RH windshield. Two switches operate the LH and RH wiper operation.
The water supply and waste water line are fitted with inline heaters at selected areas to prevent freezing. The waste water drain mast is also heated to prevent icing.
Source: Malaysian ICAO Annex 13 Safety Investigation Team for MH370, 8 March 2015, Factual Information MH370/01/15
The Factual Information was updated in 2018 by the Safety Investigation Report MH370/01/2018 which added new content but did not include all of the previous data.