American Airlines Flight 1572

American Airlines Flight 1572 was a scheduled flight from Chicago O'Hare International Airport to Bradley International Airport on November 12, 1995. The McDonnell Douglas MD-83 struck trees and an instrument landing system (ILS) antenna during landing, causing $9 million in damage to the aircraft; of the 78 occupants, only one passenger sustained minor injuries.

Flight history

Flight 1572 was scheduled to depart from O'Hare at 21:25 Eastern Standard Time. Because of bad weather and delayed connecting passengers, however, the flight was delayed and did not depart until 23:05. While en route to Hartford, the flight crew, Captain Kenneth Lee (39), and First Officer John Richards (38), received an ACARS printout for the weather at Hartford. It noted an altimeter setting (reference atmospheric pressure) of 29.42 inHg, adding that pressure was falling rapidly in the area. The flight cruised uneventfully from Chicago to Hartford, other than changing from 33000 ft to 35000 ft to avoid reported turbulence.

While on descent into Hartford, the pilots received a weather update at 00:30 that included a warning of wind shear and severe thunderstorms at Bradley. At 00:32, Flight 1572 was instructed by air traffic controllers to descend to 19000 ft. At 00:33, controllers advised Flight 1572 to descend to 11000 ft and advised the flight to use an altimeter setting of 29.40 inHg for Bradley. At 00:34, the first officer checked the Automatic Terminal Information Service (ATIS) automated weather broadcast for Hartford, and noted to the captain that the most recent ATIS broadcast was about 90 minutes old. For reasons unknown, the first officer entered 29.47 inHg on the altimeter causing it to read approximately 70 ft high. The captain checked the aircraft's weather radar before beginning the non-precision VOR approach to runway 15. Seeing no convective cells on the aircraft's path, he then turned the radar off.

At 00:49, while Flight 1572 was beginning its final approach, the crew was advised that the control tower was closing temporarily due to severe weather buckling a window inside the cab. The tower supervisor remained behind to assist the flight. The captain noticed the autopilot was having difficulty maintaining altitude and heading in the buffeting winds. Five miles from the airport the aircraft encountered heavy rain and some turbulence. The flight continued descending to 908 ft, the minimum descent altitude (MDA) for the approach. As the crew began to look for the airport, the aircraft continued descending.

At 00:51, winds at Bradley were measured as 170° at 25 kn, gusting to 40 kn, with an altimeter setting of 29.35 inHg and falling rapidly. This information was not transmitted to the Bradley control tower until 00:57 and was not made available to the flight crew before landing. At the time of the accident, the correct altimeter setting was 29.15 inHg instead of the 29.23 inHg set by the pilots.

Crash

At 00:55, the sink rate alarm went off, followed seconds later by a loud thump as the aircraft began shearing off treetops along Peak Mountain ridge. These trees were on a ridge with a ground elevation of 728 ft, and the first treetop struck was at a height of 770 ft. The captain advanced the throttles to full power, but the trees had been ingested into the engines causing them to flame out and shut down. The captain immediately lowered flaps to 40° hoping it would momentarily cause the aircraft to "balloon" upwards. While not standard operating procedure, this worked to a limited extent until the aircraft clipped a tree near the end of the runway. It then impacted the runway 33 ILS antenna equipment at the approach end of runway 15 before rolling to a stop.

The accident resulted in one minor injury to a passenger; the other 72 passengers and all 5 crew members escaped without injury. The accident resulted in $9 million in damage to the aircraft and over $74,000 in damage to airport equipment.

After the accident, N566AA was repaired and returned to service and continued to fly with American Airlines until being retired and stored in August 2017.