Aero Commander CALLAIR A-9B N7638V

Summary

On 21 August 2011 at about 22:00 local time, a Aero Commander CALLAIR A-9B registered N7638V, operated by Marshall Soaring Club Inc, was involved in an accident near Marshall, Michigan, United States. One person was on board and one died. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

21 August 2011 at 22:00

Classification

Accident

Location

Marshall, Michigan, United States

Nearest airport

Brooks Field (RMY)

Coordinates

42.2511, -84.9556

Aircraft

Aero Commander CALLAIR A-9B

Registration

N7638V

Category

Airplane

Engines

1

Operator

Marshall Soaring Club Inc

Operating rule

Part 91: General Aviation

Purpose of flight

Glider Tow

Phase of flight

Not recorded

Route

Marshall → Marshall

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CEN11LA585

1 person died.

The towplane pilot's loss of control during an aerotow operation due to the glider pilot's inability to maintain a proper position behind the towplane while encountering turbulence on initial climb.

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

Read the full NTSB narrative

The accident occurred during a glider tow operation. The glider pilot reported experiencing some turbulence during initial climb, followed by a high intensity thermal. The glider pilot lost sight of the airplane (towplane) briefly then relocated it below and to the right of the glider. He released from the towplane and landed without further incident. The glider pilot noted that the towplane appeared to be in stable flight at the time of the release. A witness stated that the takeoff appeared to be normal, but the towplane and glider encountered some turbulence near the end of the runway. He commented that the glider pilot appeared to be having some difficulty staying in position behind the towplane. At one point, the glider was subjected to a tugging motion, which appeared to be due to slack being taken out of the tow rope. The glider subsequently separated from the towplane. The towplane turned right, while the glider continued straight ahead briefly. The towplane was about 350 feet above ground level when the right wing dropped and it entered a 60- to 70-degree nose-down attitude. The towplane completed about one-half of a rotation before the witness lost sight of it behind trees. The towplane impacted an open field about 1/2 mile west of the departure end of the runway. A postaccident examination of the towplane did not reveal any anomalies consistent with a preimpact failure or malfunction. It is likely that, when the glider pilot allowed the glider to climb above the towplane to the extent that he lost sight of the towplane, the resulting tension on the tow rope reduced the towplane pilot's control authority. The resulting loss of airspeed subsequently induced an aerodynamic stall. Although the glider and the towplane separated, there was not enough altitude for the towplane pilot to recover from the upset before the towplane impacted the ground.

Quoted verbatim from the NTSB record.