Narrative:
The DC-3 departed Tehran at 09:09 for an instrument check flight, also practicing one engine flying. Feathering and unfeathering problems forced the crew to return to the airport. The DC-3 took off again at 10:48. At 11:29 the aircraft was flying at 6700 feet when the no. 1 propeller was feathered. When the prop oversped, the check pilot tried to unfeather it unsuccessfully. The prop continued to windmill at 2100 rpm.
A crash-landing was made 1500 m short of Tehran runway 11.
PROBABLE CAUSE: "With the left propeller windmilling, the right propeller did not develop sufficient thrust to enable an emergency landing to be carried out on runway 11 at Mehrabad Airport. The Committee has concluded that this was caused by mishandling of the controls by one or more of the flight crew members since the Committee has not found any evidence of malfunctioning of the right engine or of its propeller."
| Status: | Accident investigation report completed and information captured |
| Date: | Tuesday 30 June 1953 |
| Type: |  Douglas C-47A-20-DK (DC-3) |
| Operator: | Iranian Airways |
| Registration: | EP-ACV |
| MSN: | 12919 |
| First flight: | 1944 |
| Engines: | 2 Pratt & Whitney R-1830-92 |
| Crew: | Fatalities: 0 / Occupants: 6 |
| Passengers: | Fatalities: 0 / Occupants: 0 |
| Total: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Damaged beyond repair |
| Location: | Tehran ( Iran)
|
| Phase: | Unknown (UNK) |
| Nature: | Training |
| Departure airport: | Tehran-Mehrabad Airport (THR/OIII), Iran |
| Tehran-Mehrabad Airport (THR/OIII), Iran |
The DC-3 departed Tehran at 09:09 for an instrument check flight, also practicing one engine flying. Feathering and unfeathering problems forced the crew to return to the airport. The DC-3 took off again at 10:48. At 11:29 the aircraft was flying at 6700 feet when the no. 1 propeller was feathered. When the prop oversped, the check pilot tried to unfeather it unsuccessfully. The prop continued to windmill at 2100 rpm.
A crash-landing was made 1500 m short of Tehran runway 11.
Probable Cause:
PROBABLE CAUSE: "With the left propeller windmilling, the right propeller did not develop sufficient thrust to enable an emergency landing to be carried out on runway 11 at Mehrabad Airport. The Committee has concluded that this was caused by mishandling of the controls by one or more of the flight crew members since the Committee has not found any evidence of malfunctioning of the right engine or of its propeller."
Sources:
» ICAO Circular 38-AN/33 (161-163)Photos
Map
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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