ASN Aircraft accident Antonov An-28 RA-28728 Kedrovo
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Status:Accident investigation report completed and information captured
Date:Friday 16 July 2021
Time:16:11
Type:Silhouette image of generic AN28 model; specific model in this crash may look slightly different
Antonov An-28
Operator:SiLA - Siberian Light Aviation
Registration: RA-28728
MSN: 1AJ007-13
First flight: 1989
Total airframe hrs:8698
Cycles:5921
Engines: 2 Glushenkov TVD-10B
Crew:Fatalities: 0 / Occupants: 4
Passengers:Fatalities: 0 / Occupants: 15
Total:Fatalities: 0 / Occupants: 19
Aircraft damage: Substantial
Location:52 km (32.5 mls) SE of Kedrovo (   Russia)
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:Kedrovo Airport, Russia
Destination airport:Tomsk-Bogashevo Airport (TOF/UNTT), Russia
Flightnumber:SL42
Narrative:
An Antonov An-28 airplane flipped over during a forced landing between Kedrovo and Tomsk, Russia. All aboard survived the accident.
According to a preliminary report, published by the Interstate Aviation Committee, the captain made ten flights in a row and worked for 18 hours and 5 minutes, of which six hours flying time. After that, the crew went to a hotel at the Abakan Airport, and two hours later they got down to work again. According to the rules, they had to rest for at least 18 hours.

While en route between Kedrovo and Tomsk, icing caused both engines to shut down almost simultaneously. It was not possible to restart them.

Probable Cause:

Conclusion:
The accident of the An-28 aircraft, registration RA-28728, occurred during a forced landing on an improvised landing site due to the simultaneous shutdown of both engines while in flight. The need for this landing was triggered by the engines' spontaneous shutdown. The shutdown occurred while the aircraft was flying in icing conditions with the Pitot-Static System (POSS) turned off due to ice ingestion into its air intake.

The aviation incident was most likely influenced by the following factors:
- The crew's failure to follow the Aircraft Flight Manual (AFM) procedures for manually activating the POSS when meteorological conditions favored icing.
- Violation of the crew's duty and rest time regulations, which could have led to the accumulation of operational fatigue and contributed to missing the operation to activate the POSS.
- The crew's failure to make the decision to cease further performance of their duties due to the accumulation of operational fatigue in the absence of the airline's established procedures for exercising this crew right, which does not comply with the provisions of the Russian Ministry of Transport Order No. 139 dated November 21, 2005, "On Approval of the Regulation on Features of the Work and Rest Time Regime for Crew Members of Civil Aviation Aircraft in the Russian Federation."
- Increased hypoxic stress when flying at altitudes exceeding 3000 meters without the additional use of oxygen, which is a violation of the regulations of FAP-128, AFM, and the airline's internal regulations, and could have exacerbated the negative effects of operational fatigue.
- A malfunction in the ice detection sensor DSL-40T, which prevented the issuance of ice detection alerts and the automatic activation of the POSS.

Accident investigation:

Investigating agency: MAK Russia
Status: Investigation completed
Duration: 2 years and 2 months
Accident number: Final Report
Download report: Final report

Classification:
Icing
All engine powerloss
Forced landing outside airport

Sources:
» tass.ru
» MAK
» Investigative Committee of the Russian Federation


Photos

photo of Antonov-An-28-RA-28728
accident date: 16-07-2021
type: Antonov An-28
registration: RA-28728
photo of Antonov-An-28-RA-28728
accident date: 16-07-2021
type: Antonov An-28
registration: RA-28728
photo of Antonov-An-28-RA-28728
accident date: 16-07-2021
type: Antonov An-28
registration: RA-28728
photo of Antonov-An-28-RA-28728
accident date: 16-07-2021
type: Antonov An-28
registration: RA-28728
photo of Antonov-An-28-RA-28728
accident date: 16-07-2021
type: Antonov An-28
registration: RA-28728
 

Video, social media

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Kedrovo Airport to Tomsk-Bogashevo Airport as the crow flies is 372 km (232 miles).
Accident location: Exact; as reported in the official accident report.

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.
languages: languages

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Antonov An-28

  • 191 built
  • 37th loss
» safety profile

 Russia
  • 12th worst accident
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