GATINEAU, QC, June 13, 2013 /CNW/ - The Transportation Safety Board
(TSB) today released its investigation report (A10H0004) into the June 2010 runway overrun of a United Express Embraer 145
operated by Trans States Airlines LLC at the Ottawa/MacDonald-Cartier
International Airport. The investigation identified an approach that
was too fast, a landing that was too long and wet runway conditions as
major factors in the accident.
The Embraer 145 was operating as United Express flight 8050 from
Washington Dulles International Airport with 33 passengers, 2 pilots
and 1 cabin crew member aboard. The flight crew planned to land on
Runway 07 at the Ottawa airport, which was wet at the time. The crew
calculated an inaccurate approach speed and used a lesser flap setting
than recommended by the operator for landing on wet, non-grooved
runways. The aircraft flew over the beginning of the runway at a
higher-than-recommended speed and landed almost 800 feet beyond the
desired touchdown zone. The smooth touchdown on the wet runway led to
hydroplaning and thus poor braking action, causing the aircraft to come
to a stop 550 feet beyond the end of the runway. The aircraft was
significantly damaged by the uneven terrain past the runway end. The 2
pilots and 1 passenger suffered minor injuries.
Among other things, TSB investigators found that rainwater had not
drained properly from the runway, resulting in slippery conditions. The
investigation also determined that the airline did not emphasize the
lack of grooved runways in Canada to its flight crews. The company's
Standard Operating Procedures suggested that non-grooved runways are
uncommon; however, the fact is that in Canada, there are very few
grooved runways. The report noted further that the aircraft was not
equipped with engine thrust reversers, which would have helped slow the
aircraft in the wet and slippery conditions when braking action was
Since the occurrence, the operator has made changes to clarify flap
settings to be used when landing on wet or contaminated runways. The
Ottawa International Airport Authority resurfaced Runway 07/25 and
corrected its shape to improve drainage. At the same time, it built
300-metre runway end safety areas as per the TSB's Watchlist
recommendation and ICAO's recommended practice. It is the first airport
in Canada to do so. In addition, Transport Canada has since published
information and guidance regarding runway surface grooving.
The Watchlist — based on an analysis of hundreds of TSB investigation
reports, safety concerns and Board recommendations — identifies the
transportation safety issues that pose the greatest risk to Canadians.
Landing accidents and runway overruns are a TSB Watchlist issue. Watch the video!
The TSB is an independent agency that investigates marine, pipeline,
railway and aviation transportation occurrences. Its sole aim is the
advancement of transportation safety. It is not the function of the
Board to assign fault or determine civil or criminal liability.
SOURCE: Transportation Safety Board of Canada
For further information:
Transportation Safety Board of Canada
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