Don Bateman, an engineer who invented a cockpit machine that warns airplane pilots with colourful display screen shows and dire audible alerts like “Caution Terrain!” and “Pull Up!” when they’re at risk of crashing into mountains, buildings or water — an innovation that has seemingly saved hundreds of lives — died on May 21 at his residence in Bellevue, Wash. He was 91.

His daughter Katherine McCaslin stated the trigger was issues of Parkinson’s illness.

The floor proximity warning system that Mr. Bateman started engaged on within the late Sixties, and continued to enhance till he retired from Honeywell International in 2016, warns pilots in opposition to by chance slamming into land or water due to poor visibility and unhealthy climate, as soon as the commonest explanation for airline deaths.

That class of airplane crash has practically been eradicated. According to knowledge compiled by Boeing about business jets worldwide, there have been simply six such accidents from 2011 to 2020, killing 229 individuals onboard, in contrast with 17 accidents from 2001 to 2010, which left 1,007 individuals lifeless, and 27 accidents from 1991 to 2000, killing 2,237.

“Don Bateman and his team have probably saved more lives through safety system technologies than anyone else in aviation history,” Charley Pereira, a former senior aerospace engineer with the National Transportation Safety Board, wrote in an electronic mail, estimating the quantity within the hundreds.

“He was very passionate,” Mr. Pereira added. “He was a typical engineer, with pocket protector and pencils and pens, but he taught me what it means to be a safety engineer.”

Mr. Bateman was inducted within the National Inventors Hall of Fame in 2005 and received the National Medal of Technology and Innovation from Present Barack Obama in 2011 for growing and championing “flight-safety sensors, like ground proximity warning and wind-shear detection systems, now used by more than 55,000 aircrafts worldwide.”

Bob Champion, a former scientist at Honeywell who labored with Mr. Bateman, stated in a phone interview: “Don had a true passion for saving lives. He was a peach, but behind closed doors, when we were hashing things out, he could be a pit bull.”

Mr. Bateman was a pilot in his personal proper, flying a single-engine Cessna 182.

“He never lost his childlike wonder about flying,” Ms. McCaslin stated by cellphone. “He did a lot of his great work from his 40s on. He started flying and running in his 40s and went on to do 50 marathons. And he had his last child at 54.”

Charles Donald Bateman was born on March 8, 1932, in Saskatoon, Saskatchewan. His father, George, repaired watches and owned a jewellery retailer. His mom, Gladys (Noel) Bateman, was a homemaker. They divorced after World War II.

Don’s curiosity in airline security started when he was 9, when one in all his mates appeared exterior their classroom window in Saskatoon and noticed particles and what seemed to be individuals falling from the sky. Two navy planes, with 10 males aboard, had collided in midair. Don and his good friend sneaked out of faculty early and rushed to the crash website.

“I had never seen blood before from a human being,” he told The Seattle Times in 2012. “It was horrible.”

After graduating from the University of Saskatchewan in 1956 with a bachelor’s diploma in electrical and electronics engineering, Mr. Bateman labored as a tv restore technician and owned a TV restore store. He was employed by Boeing in 1958, then moved to United Control, an plane electronics firm two years later. The firm’s aviation devices enterprise is now a part of Honeywell.

Mr. Bateman told the National Science and Technology Medals Foundation in 2011 that within the late Sixties there have been deadly accidents practically each month, throughout which a pilot would “fly into something, like a mountain, or go in short on the runway.”

At the time, pilots used the altimeter, which measures altitude, terrain charts and visible cues to keep away from accidents. “But in poor visibility and clouds, those cues were less effective,” Dr. Hassan Shahidi, president of the Flight Safety Foundation, stated in an interview.

Determined to do one thing, Mr. Bateman developed — and in 1974 patented — his first floor proximity warning system: a small field that built-in knowledge from inside the plane, together with the radar altimeter and airspeed indicator, and gave the pilot a 15-second warning of an approaching hazardous situation.

The machine was in restricted use in 1971 when Alaska Airlines Flight 1866 — a Boeing 727 jet that was utilizing an early model of the system — slammed right into a fog-covered mountain within the Chilkat vary in Alaska on its strategy to touchdown in Juneau, the capital. All 111 individuals aboard died.

Two weeks later, Mr. Bateman adopted the identical path of Flight 1866 because the passenger in a small airplane outfitted together with his machine. The alarm sounded with seconds to spare, giving the pilot sufficient time to fly to security. But Mr. Bateman realized that it wasn’t sufficient time for the Alaska Airlines pilot to have reacted.

“I was disappointed,” he told Bloomberg.com in 2016. “We needed to do better.”

He did. In 1974, the system had improved sufficient, offering earlier warnings, for the Federal Aviation Administration to mandate its set up into all home plane. The company acted after a TWA flight crashed right into a wooded slope in Virginia that 12 months, killing 92 individuals, an incident that prompted a Congressional panel to criticize the company for delaying measures to enhance airline security.

In the Nineties, the system improved exponentially. Engineers working with Mr. Bateman added GPS and significant terrain knowledge, together with topographical maps of Eastern Europe and China that had been charted by the Soviet Union way back to the Nineteen Twenties; they’d been acquired in Russia at Mr. Bateman’s request.

“We knew, as engineers, that if we could get the terrain data, we could do an awful lot,” he informed The Seattle Times.

Critically, the rechristened Enhanced Ground Proximity Warning System, or EGPWS, gave pilots a two-minute warning of obstacles forward. In 2000, properly after many main business airways had already begun utilizing the system, the F.A.A. required that or not it’s put in in all registered turbine-powered airplanes with six or extra passenger seats.

In addition to Ms. McCaslin, Mr. Bateman is survived by his spouse, Mary (Contreras) Bateman; one other daughter, Wendy Bastian; two sons, Greg and Patrick; eight grandchildren; and two great-grandchildren. His marriage to Joan Berney led to divorce. A 3rd son, Dan, died in 1988.

In 2015, Mr. Bateman wrote in Hindsight magazine, an airline security publication, about six latest, independently investigated incidents during which the warning system averted catastrophe.

In 2014, for instance, the crew of a Saab 2000 twin-engine turboprop misplaced management of the plane close to Sumburgh, Scotland, after failing to acknowledge that the autopilot was nonetheless on after a lightning strike. But, Mr. Bateman wrote, the crew “recovered from a high rate of descent toward the sea surface after EGPWS warnings occurred.”