By: Greg Burchell
Dec. 17, 2012
GATINEAU, Que. (Canadian OH&S News)
The
Transportation Safety Board of Canada (TSB) has determined that a case
of bad gas brought down a helicopter in Quebec last year.
The
board has released its findings into a helicopter incident in March of
2011 that sent two passengers to hospital, finding three helicopters,
including the one that crashed, were refuelled with Jet A-1 fuel instead
of the required AVGAS 100LL.
The three Robinson R44 II
helicopters had been travelling from Port-Menier, Que. to Quebec City
when they stopped for fuel in an unplanned detour, due to weather, in
Forestville, Que. The employee at the aerodrome where they landed,
working alone, had only worked at the fuel station for about four months
and had never refuelled a helicopter with AVGAS, the TSB investigation
noted, and their training also did not mention some helicopters use
AVGAS.
During the doomed helicopter’s initial climb, it lost
engine power at about 1,000 feet, forcing the pilot to land in a
residential neighbourhood, the investigation report said, substantially
damaging the helicopter and injuring the two occupants. The other two
birds were able to land nearby safely.
“It would be like putting
diesel fuel in your car,” explained Yanick Farazin, the lead
investigator on the incident and a senior investigator at the TSB in
Ottawa. Jet A-1 fuel is similar to a refined diesel and is used to fuel
turbine engines, whereas AVGAS is for piston engines similar to unleaded
fuel.
“Usually we’ll see two categories of gasoline,” Farazin said, but “in those two different categories there are many types.”
Farazin
said the helicopter that crashed was the last aircraft to take off
after refuelling, and it ran on the ground for longer than the other
two, who took off quickly after refuelling.
“We suspect that
because of the way it was fuelled, the Jet A-1 fuel entered the system
quicker than the others. As soon as they discovered this loud bang and
realized the wrong fuel was added, the other two aircraft landed as soon
as possible … They didn’t take any chances,” he said. “If they would
have stayed airborne and said ‘wow, I wonder what’s going on with the
third aircraft’ they would have had issues.”
No standards set by regulator in refueller training
The
craft’s operating handbook recommends pilots take fuel samples after
refuelling, as fuel can be distinguished by colour — AVGAS is blue while
Jet A-1 is a light yellow. But the investigation report noted that
pilots do not typically take samples after refuelling because it does
not allow time for any contaminants to settle. The pilots were also in a
rush to get back to Quebec City before nightfall, as they were not
certified to fly at night.
“If they stopped and fuelled right
away, they would have had to delay their departure, let’s say 30
minutes, then verify the fuel. For them that was not an option, the
night was coming and they had to get to Quebec City, so there was a
little bit of pressure they put themselves into at that point,” Farazin
said.
While Transport Canada does not set standards for
refueller training programs or qualifications, the investigation report
noted that the employee would have “greatly benefitted from a more
detailed training program” and having aircraft reference material onhand
would have helped bolster the defences against accidents like what
occurred.
Other contributing factors, the TSB noted, were that
the pilots did not supervise the employee during refuelling and the Jet
A-1 fuel nozzle had been modified to be smaller than normal so it would
be able to refuel more helicopters, but also into the smaller AVGAS
tanks.
Source: http://www.ohscanada.com
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