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#35 Ice and Rain Protection Boeing 747 400 CBT
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#35 Ice and Rain Protection Boeing 747 400 CBT

Ice and Rain Protection Systems Overview

Introduction to Ice and Rain Protection Systems

  • The module covers ice and rain protection systems, including windows, nacelles, wings, ice detectors, and probes. These systems are crucial for preventing icing during flight.

Window Ice and Rain Protection Features

  • Controls for window ice protection are located on the overhead panel; activating the window heat provides electrical power for windshield heating. An advisory message appears if overheating occurs or if the switch is off.
  • The system resets after a 10-second cooldown when the window heat switch is turned off; turning it back on restores electrical heat. Windshield air switches are available on both captain's and first officer's panels for defogging purposes.
  • Windshields feature two-speed wipers with a spring-loaded washer switch that dispenses fluid while held down; the washer reservoir has a sight gauge indicating refill levels.

Nacelle Anti-Icing System

  • Icing can occur at temperatures of 10°C or below with visible moisture present; nacelle anti-ice should be activated in such conditions both in-flight and on-ground using bleed air as a heat source.
  • Each engine has a three-position nacelle anti-ice switch located on the overhead panel: ON activates anti-ice, OFF deactivates it, while AUTO operates automatically based on inputs from the ice detection system.

Wing Anti-Icing System

  • A single wing alternate action anti-ice switch is positioned below nacelle switches; this system functions only in-flight with leading edge flaps retracted, heating only outboard leading edges of engines 2 and 3. Ground logic closes valves automatically when necessary.

Ice Detection System

  • The ice detection system includes two probes that detect ice presence; once sufficient ice is detected, nacelle anti-ice activates automatically until no longer needed, displaying caution messages accordingly if any issues arise with selected settings or temperatures above thresholds.

Probes Heating Mechanism

Video description

The Boeing 747-400 is a large, long-range wide-body airliner produced by Boeing Commercial Airplanes, an advanced variant of the initial Boeing 747. The "Advanced Series 300" was announced at the September 1984 Farnborough Airshow, targeting a 10% cost reduction with more efficient engines and 1,000 nautical miles [nmi] (1,900 km; 1,200 mi) of additional range. Northwest Airlines became the first customer with an order for 10 aircraft on October 22, 1985. The first 747-400 was rolled out on January 26, 1988, and made its maiden flight on April 29, 1988. Type certification was received on January 9, 1989, and it entered service with NWA on February 9, 1989. It retains the 747 airframe, including the 747-300 stretched upper deck, with 6-foot (1.8 m) winglets. The 747-400 offers a choice of improved turbofans: the Pratt & Whitney PW4000, General Electric CF6-80C2 or Rolls-Royce RB211-524G/H. Its two-crew glass cockpit dispenses with the need for a flight engineer. It typically accommodates 416 passengers in a three-class layout over a 7,285 nmi (13,492 km; 8,383 mi) range with its 875,000-pound (397 t) maximum takeoff weight (MTOW). The first -400M combi was rolled out in June 1989. The -400D Domestic for the Japanese market, without winglets, entered service on October 22, 1991. The -400F cargo variant, without the stretched upper deck, was first delivered in May 1993. With an increased MTOW of 910,000 lb (410 t), the extended range version entered service in October 2002 as the -400ERF freighter and the -400ER passenger version the following month. Several 747-400 aircraft have undergone freighter conversion or other modifications to serve as transports of heads of state, YAL-1 laser testbed, engine testbed or the Cosmic Girl air launcher. The Dreamlifter is an outsize cargo conversion designed to move Dreamliner components. With 694 delivered over the course of 20 years from 1989 to 2009,[3] it was the best-selling 747 variant. Its closest competitors were the smaller McDonnell Douglas MD-11 trijet and Airbus A340 quadjet. It has been superseded by the stretched and improved Boeing 747-8, introduced in October 2011. In the late 2010s, older 747-400 passenger aircraft were being phased out by airlines in favor of long-range, wide-body twinjet aircraft, such as the Boeing 777 and Airbus A350.