Beechcraft D55 N321N

Summary

On 11 June 2024 at about 03:00 local time, a Beechcraft D55 registered N321N, operated by Peterson Space Force Aero Club, was involved in an accident near Colorado Springs, Colorado, United States. 2 people were on board and one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

11 June 2024 at 03:00

Classification

Accident

Location

Colorado Springs, Colorado, United States

Nearest airport

City of Colorado Springs Munic (COS)

Coordinates

38.8058, -104.7008

Aircraft

Beechcraft D55

Registration

N321N

Category

Airplane

Year built

1968

Engines

2

Operator

Peterson Space Force Aero Club

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Route

Colorado Springs → Colorado Springs

Aircraft damage

Substantial

Weather

VMC

Light

Night

NTSB number

CEN24LA227

1 person had minor injuries.

The deflated right main landing gear tire due to a sidewall puncture made by an unknown object, which led to the pilot’s loss of directional control and the landing gear collapse during landing roll.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The flight instructor and the pilot-receiving-instruction were conducting a nighttime currency/proficiency flight when, after an uneventful landing flare and touchdown, the airplane began to vibrate and veer right during the landing roll. The pilot-receiving-instruction, who was the pilot flying during the landing, released toe brake input but the vibration increased as the airplane continued to veer right. Ultimately, the right main landing gear collapsed, and the airplane came to rest upright in the grass adjacent to the runway. The right wing main spar was substantially damaged when the right wing struck the ground after the landing gear collapsed. Examination of the right main landing gear tire and its tube revealed a sidewall puncture. The puncture was made by an unknown small, sharp object, which left a clean cut on the tube sidewall that measured about 0.25-inch long with the tube deflated, and 0.375-inch long when the tube was reinflated. During the landing roll, it is likely that the tube lost enough pressure that it began to move around the wheel rim until the valve stem severed and there was total loss of remaining tire pressure. The increasing vibration felt by the pilots during landing roll is consistent with a progressive loss of tire pressure, and the increased drag from the deflated right tire would explain airplane’s tendency to veer right. The right main landing gear likely collapsed when the over-center down lock assembly disengaged due to an excessive sideload during the right swerve.

Quoted verbatim from the NTSB record.