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ASN Wikibase Occurrence # 167788
Last updated: 15 June 2020
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Date:05-JUL-2014
Time:16:05
Type:Silhouette image of generic PA31 model; specific model in this crash may look slightly different
Piper PA-31P Pressurized Navajo
Owner/operator:Omega Parachute School
Registration: N11WB
C/n / msn: 31P-7630005
Fatalities:Fatalities: 11 / Occupants: 12
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Topolów near Czestochowa -   Poland
Phase: Initial climb
Nature:Parachuting
Departure airport:Rudniki Airport
Destination airport:Rudniki Airport
Investigating agency: SCAAI Poland
Narrative:
On July 5, 2014, at 1605 local time, a Piper PA-31P airplane, United States registered N11WB, was destroyed when it impacted terrain after takeoff near Czestochowa, Poland. Visual meteorological conditions prevailed at the time of the accident. The pilot and ten passengers were fatally injured; one passenger sustained serious injuries. The local skydiving flight was originating at the time of the accident.
The Polish investigators reported that the airplane impacted the ground in a nose low attitude in a steep bank. The no.1 engine was not operating at the time of the crash.

Causes of the accident:
During the investigation, PKBWL found the following causes of an air accident:
1. Operation of the aircraft without a valid Airworthiness Certificate.
2. Damage and destruction of the pin clutch connecting the crankshaft to the transmission shaft of the right engine propeller, which caused the right propeller to disengage from operation and interrupted the operation of the angle of attack of its blades, causing them to set into a flag, which resulted in thrust asymmetry leading to stall aircraft and loss of control. Damage to the pin clutch connecting the crankshaft to the drive shaft of the right engine transmission could be due to the following causes:
- earlier impact of the propeller in an obstacle, in circumstances and time which could not be determined.
- a long-term fatigue process caused by uneven engine operation (one of the cylinders was replaced in this engine).
3. Stall in the last phase of emergency landing.

The circumstances favorable to the accident are:
a) Improper maintenance of the aircraft.
b) Lower left engine power due to incorrect operation.
c) The use of fuel that does not comply with the requirements of the Engine Manufacturer.
d) Modification of the aircraft in violation of its Type Certificate.
e) Meteorological conditions - high ambient temperature.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20140707X04352&key=1
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=11WB

Accident investigation:
cover
  
Investigating agency: SCAAI Poland
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
05-Jul-2014 17:36 harro Added
05-Jul-2014 18:12 wk Updated [Time, Location, Phase, Damage]
07-Jul-2014 18:37 kootcha Updated [Source]
09-Jul-2014 10:01 mikeepbc Updated [Operator, Source, Embed code, Narrative]
09-Jul-2014 10:05 Anon. Updated [Source, Embed code]
08-Aug-2014 06:48 wk Updated [Source]
21-Apr-2015 23:06 Dr. John Smith Updated [Source, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
22-Oct-2017 17:53 Dr. John Smith Updated [Location, Source, Narrative]
22-Oct-2017 17:55 Dr. John Smith Updated [Source]
30-Nov-2017 18:50 ASN Update Bot Updated [Cn, Operator, Other fatalities, Location, Departure airport, Destination airport, Source, Narrative]
14-Jul-2019 16:05 harro Updated [Operator, Other fatalities, Location, Departure airport, Destination airport, Source, Narrative]
24-Feb-2020 13:02 harro Updated [Narrative, Accident report, ]

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