After landing on an non-grooved runway in rain; the flight crew of a small air carrier jet was unabl...

Attributes
ACN	967904
Time
Date	201109
Local Time Of Day	1201-1800
Place
Locale Reference	CYOW.Airport
State Reference	ON
Environment
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Component
Aircraft Component	Main Gear
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Commercial
Events
Anomaly	Ground Event / Encounter Other / Unknown Ground Excursion Runway

Narrative:

We were cleared to land on runway 32 in cyow. We had been informed by ATC that the rain had begun falling on the field. The approach and landing were normal. After touchdown; normal braking was applied; but the aircraft refused to decelerate. We continued down the runway with no reduction in speed while applying full brake pressure. The aircraft began a slow veer to the left. Immediate right rudder was applied to keep the aircraft tracking straight; but the rudder was ineffective.the aircraft departed the left side of the runway and into the grass. The main gear collapsed and the plane came to rest on the still intact nose gear. The sudden downpour on a non-grooved; un-crowned runway created ideal conditions for a hydroplane event. The full application of brakes had no discernible effect on the aircraft and the plane became uncontrollable in spite of the best efforts of the pilots.

Original NASA ASRS Text

Title: After landing on an non-grooved runway in rain; the flight crew of a small air carrier jet was unable to slow the aircraft and it exited the paved surface off the left side; collapsing both main gear. The First Officer believes the lack of thrust reversers played a significant role.

Narrative: We were cleared to land on Runway 32 in CYOW. We had been informed by ATC that the rain had begun falling on the field. The approach and landing were normal. After touchdown; normal braking was applied; but the aircraft refused to decelerate. We continued down the runway with no reduction in speed while applying full brake pressure. The aircraft began a slow veer to the left. Immediate right rudder was applied to keep the aircraft tracking straight; but the rudder was ineffective.The aircraft departed the left side of the runway and into the grass. The main gear collapsed and the plane came to rest on the still intact nose gear. The sudden downpour on a non-grooved; un-crowned runway created ideal conditions for a hydroplane event. The full application of brakes had no discernible effect on the aircraft and the plane became uncontrollable in spite of the best efforts of the pilots.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

After landing on an non-grooved runway in rain; the flight crew of a small air carrier jet was unable to slow the aircraft and it exited the paved surface off the left side; collapsing both main gear. The first officer believes the lack of thrust reversers played a significant role.