by rain. Just before wheel contact was to have been established, gusty wind was encountered and rain reduced the visibility through the windshield to zero. Applying partial power to maintain flying speed, Captain Jeppesen continued flight at 85 miles per hour until restored visibility enabled him to complete the lending. Actual wheel contact was made at approximately 80 m.p.h. indicated air speed, with between 2400 and 3000 feet of runway in which to stop rolling. Captain Jeppesen applied pressure to the brake pedals without noticeable response; then the captain and first officer applied pressure to the brake pedals simultaneously but obtained no noticeable response until they were within 200 to 300 feet of the end of the runway. The plane, still moving at 20 to 25 miles per hour, continued north through the boundary lights and across a 3-foot ditch, where the right landing gear failed, to a point 221 feet north of the boundary lights.
Investigation disclosed no mechanical defeat in the braking system. Although the tires were found to be worn, their condition did not show any localized abrasion such as would be expected to result from skidding. Captain Jeppesen, with more than 10,000 hours of flying, has an exception record for reliability and sound judgement. It was his opinion that, with normal braking effect, there was adequate room to stop.
PROBABLE CAUSE: Ineffective brake action.
CONTRIBUTING FACTORS:
1. Extended landing approach due to restricted visibility.
2. Slipperiness of runway surfaces due to rain.
BY THE BOARD:
/s/ Darwin Charles Brown
