The internal wires often broke while in use, shocking (and sometimes burning) the wearer and leaving them without heat.Įlectric suits plugged into a heater control box located at each crew station.īomber crew clothing improved dramatically during the war. The single-circuit F-1 was notoriously unreliable. This early F-1 suit was nicknamed the “Blue Bunny” for its distinctive color. They had internal wires that functioned like those in a heating pad. Some crewmen wore electrically-heated undergarments and gloves. The B-24’s heating system was no better.Įarly bomber crewmen wore thick sheep shearling clothing to fend off the crippling cold. The B-17’s heating system kept the cockpit warm, but it was not effective at other crew stations. With temperatures as low as 50 degrees below zero Fahrenheit at high altitude, frostbite from the bitter cold was a constant danger. If damaged, the pressurized oxygen released created a serious fire hazard. These bottles contained about 12 minutes of oxygen.Ī bailout bottle, which was attached to the parachute harness or strapped to a leg, provided enough oxygen to drift down to a safe altitude.Ī heavy bomber carried several oxygen tanks to supply the aircraft’s system. ![]() The mask on display was a typical type used in 1944, which by then also contained an integral microphone.Įach crew station contained a regulator that connected the mask to the aircraft’s oxygen system.Ĭrewmen plugged their oxygen masks into a “walkaround bottle” to carry with them when they moved around the aircraft. At high altitude, crewmen needed supplemental oxygen at all times-malfunctions, such as blocked hoses and frozen oxygen masks, killed some Airmen. Flying many hours at high altitude in unpressurized aircraft, however, created other hazards for the crews.Īt 25,000 feet, a crewman without supplemental oxygen passed out in 3-5 minutes, followed by death soon after. US Army Air Forces heavy bombers in Europe typically flew at 20,000 to 30,000 feet to reduce vulnerability to antiaircraft fire. Recognition instructions for November 4-5, 1942, showing the correct flare cartridge colors, what Morse code letters to flash, and what color filter to be used in a signal lamp. ![]() Color filters, like those on display, could also be attached for prearranged signals.ĭifferent colored flares could be fired from the aircraft to indicate various prearranged signals, such as declaring an emergency landing, notifying there are wounded on board, or to identify the aircraft as friendly. Morse code represents letters with combinations of long and short signals (“dots” and “dashes”).Īlso called Aldis lamps, signal lamps permitted bomber crews to communicate between aircraft using Morse code and without using the radio. The radio operator’s equipment included a telegraph key to send Morse code messages over long distance. When this was used, it canceled out all other communication. CALL: Alerted crewman within the aircraft to switch to INTER. INTER: To communicate within the aircraft.ĥ. COMMAND: For air-to-ground communication in MF (Medium Frequency).Ĥ. LIAISON: To communicate with other aircraft in the formation with VHF (Very High Frequency).ģ. ![]() COMP: Radio compass receiver (for navigation)Ģ. Early crews wore throat microphones, while later Airmen had microphones mounted in their oxygen masks.Ī box mounted at crew stations controlled communication:ġ. Some crewmen wore a headset over a “50-mission crush cap”-others wore flight helmets that contained headphones. Many different systems and methods permitted the exchange of information. Of particular importance was communication among the crew to call out the direction of attacking fighters. With hundreds of aircraft and thousands of Airmen in the air on a mission, communication within and between aircraft could be challenging. Here, two B-17s flying through overcast skies collided while returning from a mission-all crewmen aboard both aircraft were killed. This illustration shows the designated locations for each bomber group to form up in overcast weather.Ĭollisions within formations were not uncommon. ![]() With bases close together and hundreds of bombers in the air, forming up was a time-consuming challenge. A single burst of flak is visible in the middle of the image. These formations evolved over time to counter enemy tactics and to adjust for the increasing numbers of heavy bombers involved.ī-17 formation during the mission against the Messerschmitt Bf 110 assembly plant in Brunswick, Germany on January 11, 1944. Formations were designed to protect heavy bombers against fighter attack and to concentrate the bomb pattern on the target.
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