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ASN Wikibase Occurrence # 138579
Last updated: 12 December 2017
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Date:17-SEP-2011
Time:14:34
Type:Silhouette image of generic T28 model; specific model in this crash may look slightly different
North American T-28C Trojan
Owner/operator:Private
Registration: N688GR
C/n / msn: 140581
Fatalities:Fatalities: 1 / Occupants: 1
Airplane damage: Substantial
Category:Accident
Location:Eastern WV Regional Airport/Shepherd Field - KMRB, WV -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Demo/Airshow/Display
Departure airport:Martinsburg, WV (MRB)
Destination airport:Martinsburg, WV (MRB)
Investigating agency: NTSB
Narrative:
After takeoff for an airshow performance, the pilot performed maneuvers consisting of a barrel roll, loop, and an opposing pass with another airplane, culminating with an aileron roll. Witnesses and recorded video indicated that after the two airplanes crossed, the accident pilot began an aileron roll to the left, which degraded into a barrel roll. After completing about 270 degrees of the roll, the airplane stopped rolling and continued in a right-wing-down, nose-low attitude until impact. Review of the video revealed no separation of airplane parts and no obvious attempt by the pilot to recover. Postaccident examination of the airframe and flight controls and a cursory examination of the engine revealed no evidence of preimpact failure or malfunction that would have precluded normal operation.

According to the pilot's medical records, he developed early onset coronary artery disease and suffered a heart attack (myocardial infarction) at age 46, requiring urgent four-vessel coronary artery bypass graft (CABG) surgery in 2003. One of his grafts failed in the first year, and further intervention by surgery or angioplasty was deemed impossible. The pilot was aggressively treated for high cholesterol following his heart attack and also developed diabetes. Even with intensive treatment, atherosclerosis will predictably continue to develop. Thus, the risk of death and other major adverse cardiovascular events following CABG is significant and increases over time. Studies indicate that by 8 years following CABG surgery, approximately 30 percent of diabetic patients have died; this increases to nearly 40 percent by 12 years.

Following his surgery, the pilot applied for a special issuance of his medical certificate. During that process, he did not indicate that he intended to fly aerobatics. The pilot received a special issuance third class medical certificate, which was renewed annually. However, he was not asked again about the types of flying he was doing or intending to do. Although the pilot routinely passed regular exercise stress testing as part of the special issuance requirements, his personal medical records indicated that he had a small area of his heart muscle that was repeatedly identified as at risk on nuclear imaging studies.

The sudden changes in cardiac work associated with g-loading and unloading may be an independent risk factor for cardiac arrhythmia in the setting of a scar resulting from previous infarction. Even without g-loading, the risk of arrhythmia is highest in the first minutes, hours, and days after a heart attack. According to autopsy results, the medical examiner found a "fresh" area of myocardial infarction (heart attack) on the gross pathology; however, no microscopic analysis was performed. That the medical examiner was able to identify an area of grossly abnormal tissue suggests the event occurred hours to a couple of days previously. A closer approximation of the timing of the pilot's final myocardial infarction could not be determined.

The evidence indicates that the pilot likely became impaired or incapacitated while flying a low-altitude aerobatic maneuver soon after suffering a heart attack. The FAA knew about the pilot's medical condition and appropriate procedures had been followed during the evaluation for his aerobatic competency card. Currently, there are no limitations to permitted flight characteristics for special issuance medical certificates, including those issued for cardiac disease.

In January 1999, as a result of several investigations involving pilot incapacitation, including accidents during airshow performances, the NTSB issued Safety Recommendations A-99-1 and -2 asking the FAA to, respectively, "restrict all pilots with special issuance certificates due to cardiac conditions that could affect their g-tolerance from engaging in aerobatic flight" and "restrict all pilots taking medication that reduces g-tolerance from engaging in aerobatic flight." In evaluating these recommendations, FAA personnel reviewed an NTSB-supplied list of accidents using the
Probable Cause: The pilot's impairment or incapacitation that occurred during a low-altitude aerobatic maneuver due to complications from a recent heart attack, resulting in his inability to maintain control of the airplane. Contributing to the accident was the Federal Aviation Administration's willingness to allow an airman with well-documented, severe coronary artery disease to perform high-risk, low-altitude aerobatic maneuvers.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20110918X02047&key=1


Revision history:

Date/timeContributorUpdates
17-Sep-2011 14:12 gerard57 Added
17-Sep-2011 16:19 gerard57 Updated [Source, Narrative]
17-Sep-2011 18:01 RobertMB Updated [Time, Aircraft type, Registration, Cn, Operator, Other fatalities, Location, Source, Narrative]
18-Sep-2011 04:18 vielmetti Updated [Departure airport, Destination airport, Source]
18-Sep-2011 04:24 harro Updated [Time, Operator, Location, Embed code, Narrative]
18-Sep-2011 16:33 Dr. John Smith Updated [Source, Embed code, Narrative]
18-Sep-2011 17:43 RobertMB Updated [Operator, Location, Departure airport, Destination airport, Source, Embed code, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:13 ASN Update Bot Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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