NTSB Identification: ERA16LA213
14 CFR Part 91: General Aviation
Accident occurred Friday, June 10, 2016 in Apopka, FL
Probable Cause Approval Date: 10/17/2017
Aircraft: CESSNA 310, registration: N8943Z
Injuries: 1 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The airline transport pilot reported that the accident flight was the airplane’s first flight following completion of an annual inspection. He added that there were no issues with the brakes while taxiing to fuel the airplane or to depart. After performing two touch-and-go landings and a go-around, the pilot approached the runway intending to conduct a full-stop landing. He stated that the airplane touched down at the normal point/location and that he then retracted the flaps during the landing roll but waited to apply brakes until the airplane approached the end of the runway. Upon applying the brakes, the left brake did not work, but the right brake did, which resulted in the airplane drifting right. The pilot realized that the airplane was going to exit the right side of the runway, so he secured the engines and attempted to maintain control while applying right braking in an effort to slow the airplane. The airplane travelled off the right side of the runway and impacted upsloping terrain.
Initial postaccident operational testing of the brakes revealed no discrepancies with the left brake. No brake system leaks were noted, and the fluid levels in both brake master cylinders were at correct levels. However, during subsequent operational testing of the left brake master cylinder, the left brake worked satisfactorily once but failed during subsequent testing.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The intermittent failure of the left brake master cylinder, which resulted in asymmetric braking and the subsequent loss of directional control during the landing roll.
The National Transportation Safety Board did not travel to the scene of this accident.
Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Orlando, Florida
Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf
Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms
NTSB Identification: ERA16LA213
14 CFR Part 91: General Aviation
Accident occurred Friday, June 10, 2016 in Apopka, FL
Aircraft: CESSNA 310, registration: N8943Z
Injuries: 1 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
On June 10, 2016, about 1610 eastern daylight time, a Cessna 310G, N8943Z, collided with a berm while landing at Orlando Apopka Airport (X04), Apopka, Florida. The airline transport pilot was not injured, and the airplane was substantially damaged. The airplane was registered to SOFI, LLC, and was operated by a private individual under the provisions of 14 Code of Federal Regulations as a Part 91 local, post maintenance test flight. Visual meteorological conditions prevailed and no flight plan was filed for the flight that departed from X04 at 1515.
The accident flight was the airplane's first flight after an annual inspection. Prior to that flight, it had not been operated in the previous 2 years.
The pilot stated that after release from the inspection, he performed a preflight inspection and noticed several discrepancies, none of which were related to the aircraft's brake system. After the airplane was removed from the hangar, he started the engines and taxied to a place where he fueled the airplane, and during the taxi, he did not indicate any issues with the aircraft's brakes. Following fueling he taxied to runway 33, a 3.987-foot-long asphalt runway where he initiated takeoff and remained in the traffic pattern performing two touch-and-go landings to the same runway.
After the second touch-and-go landing, he remained in the traffic pattern and intended to perform a full-stop landing; however, he had to initiate a go-around because another airplane was on the runway. He returned and reported the touchdown was normal and in the normal/typical location. After touchdown he retracted the flaps and allowed the airplane to slow aerodynamically to the end of the runway. As the airplane approached the end of the runway, the pilot applied the normal brakes; however, the left brake did not function. The airplane started drifting to the right, and as the airplane slowed to a slow taxi speed, the right deviation became more pronounced and he pumped the left brake and applied pressure but it seemed the left brake pedal went to the floor with no pressure or effect. When it became evidence that the airplane would depart the runway he secured the engines, and attempted to maintain control while applying the right brake in an effort to slow the airplane. The airplane went off the right side of the runway at the end and contacted upsloping terrain which caused spar damage to the left horizontal stabilizer.
Operational testing of the pilot's side brakes by a Federal Aviation Administration (FAA) operations inspector following recovery revealed no discrepancies; however, operational testing of the brakes on the copilot's side revealed a discrepancy with the right brake. No brake system leaks were noted and the fluid levels in both brake master cylinders were at the correct level. The airplane was retained for further examination.
Further examination of each brake master cylinder was performed by an FAA airworthiness inspector. Following removal from the airplane, the left brake worked once but on the second actuation, the actuating rod slowly leaked internally to the bottom. The right brake worked perfectly when removed. Both cylinders had an acceptable fluid level after removal. Disassembly of the brake master cylinders revealed all o-rings were in a reasonable condition with no visible cuts or tears. The left brake had a dark crusty compound and a small washer in the reservoir, while the right brake had the same compound including the washer, but was not as contaminated as the left. It was not possible to determine part numbers or serial numbers of either brake master cylinder as the data plates were damaged by hydraulic fluid.
According to the facility that performed the inspection, they utilized a generic twin-engine checklist to perform the inspection. The owner/general manager of the facility where the inspection was performed stated there were no discrepancies related to the brakes during the engine run-ups prior to the inspection.
14 CFR Part 91: General Aviation
Accident occurred Friday, June 10, 2016 in Apopka, FL
Aircraft: CESSNA 310, registration: N8943Z
Injuries: 1 Uninjured.
This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
On June 10, 2016, about 1610 eastern daylight time, a Cessna 310G, N8943Z, collided with a berm during the landing roll at the Orlando Apopka Airport (X04), Apopka, Florida. The airline transport pilot was not injured, and the airplane was substantially damaged. The airplane was registered to SOFI, LLC, and was operated by a private individual under the provisions of 14 Code of Federal Regulations as a Part 91 local, post maintenance test flight. Visual meteorological conditions prevailed and no flight plan was filed for the flight that departed from X04 at 1515.
The accident flight was the airplane's first flight after an annual inspection, and it had not been flown for about 2 years prior.
According to a Federal Aviation Administration (FAA) inspector, the pilot stated he taxied to runway 33, a 3,987-foot-long, 60-foot-wide, asphalt runway, departed and performed two touch-and-go landings. After the second touch-and-go landing, he intended to perform a full-stop landing. The pilot reported the touchdown was normal and in the normal/typical location. After touchdown he retracted the flaps and allowed the airplane to slow aerodynamically to the end of the runway. As the airplane approached the end of the runway, the pilot applied the normal brakes; however, the left brake did not function. He secured the engines, and attempted to maintain control while applying the right brake in an effort to slow the airplane. The airplane went off the right side of the runway at the end and contacted upsloping terrain which caused spar damage to the left horizontal stabilizer.
Post accident examination of the airplane's brake system was performed following recovery of the airplane by an FAA airworthiness inspector. Operational testing of the brakes on the pilot's side revealed no discrepancies; however, operational testing of the brakes on the copilot's side revealed a discrepancy with the right brake. No brake system leaks were noted and the fluid levels in both brake master cylinders were at the correct level. The airplane was retained for further examination.
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