Question: Was the May 7, 1928 plane crash on Stone Mountain caused by alcohol?
About the article "Stone Mountain", section "Aviation accidents".

Candidate passages:
According to George Weiblen's annotated calendar for Monday, May 7, 1928: "Mail plane crashed on mountain at 8:00 P.M."Around dusk on September 16, 2003, in clear weather, a small airplane circled the mountain five times, then crashed headlong into the south side, burst into flames and killed the pilot.
A witness testifying at the NTSB investigation stated that the pilot, a 69-year-old accountant, had threatened on multiple occasions to commit suicide by flying into the mountain.
The official NTSB accident report lists the probable cause as "The pilot's intentional flight into the ground for the purpose of suicide while impaired by alcohol."
 Governor of Montana Donald G. Nutter was killed, along with five other people, in a plane crash.
Nutter had been on his way from Helena to a speaking engagement in Cut Bank when his C-47 plane went down in a mountain canyon near Wolf Creek.
He was succeeded by Lt.
Governor Tim M. Babcock.
Anandyn Amar, who had served twice as Prime Minister of Mongolia (1928–30 and 1936–39) and Chairman of the Presidium of State (1932–36) before becoming a victim of a purge by Joseph Stalin, was posthumously rehabilitated, more than 20 years after his execution by the Soviet Union on July 27, 1941.  
On May 24, 1981, a plane carrying the President, Minister of Defense, assistants and their spouses crashed into the Huairapungo Mountain, in Celica Canton of Loja Province.
The crash left no survivors: killed along with the president were First Lady Martha Bucaram, Minister of Defense Marco Subía Martínez and his wife, as well as two aides-de-camp and three other passengers.
The controversy about the cause of the crash began immediately, when the Accident Investigation Committee ("Junta Investigadora de Accidentes", JIA) of the Ecuadorian Air Force attributed the crash to pilot error, supposedly caused by an overloading with cargo.
The parliamentary commission formed months after, after pressure from the families of the victims and political groups allied with the president, found contradictions and inconsistencies in the JIA report, but could not reach definitive conclusions especially since the aircraft that was purchased by the Air Force to operate as a VIP transport lacked the Flight Data Recorder equipment (Black Box).
The Zurich Police, who also conducted an investigation, concluded that the plane's motors were shut down when the plane crashed into the mountain.
This opinion, which contradicted the Air Force Report, was not investigated further by the Ecuadorian government.
The American author and activist John Perkins, in his book "Confessions of an Economic Hit Man", concludes that Roldós was assassinated, because his plan to reorganize the hydrocarbon sector would have threatened U.S. interests.
Roldós had entered into a pact with neighboring Colombia and Peru, a pact which US President Reagan saw as a tilt toward the Soviet Union.
Just months after Roldós died, another Latin American leader who had been at odds with U.S. interests in the control of the Panama Canal, Panama's Omar Torrijos, died in what was allegedly just a plane crash, which also is perceived by some to have been a CIA-conducted assassination, again according to John Perkins. 
The "Father of Crash Survivability", Hugh DeHaven, was a plane pilot.
His interest in crash survivability was sparked by his surviving a plane crash during the First World War. 
  January 12, two Mi-8 pilots, including the Hero of the Soviet Union Nikolay Maidanov, killed in an ambush as they prepared to land at Grozny Khankala airfield; the machine was crash-landed by the flight technician.
January 22, one Mi-8 helicopter suffered mechanical malfunction and crash-landed; no casualties.
Another Mi-8 suffered mechanical malfunction and crash-landed; several injured.
January 29, two Russian Mi-8 transport helicopters came under fire over southern Chechnya, killing one man and severely wounding another.
February 18, a Russian army Mi-8 transport helicopter was shot down in the south of Chechnya, killing 15 people aboard.
February 21, an Mi-24 assault helicopter was heavily damaged by ground fire near Shatoi and crash-landed; no casualties.
May 7, a Su-24MR reconnaissance plane crashed into a mountain in dense fog near the village of Benoi-Vedeno during a target-acquisition mission for a flight of several Su-25; the crew of two were killed.
May 14, an Mi-8 crashed on take-off due to a technical problem; 15 people on board were injured.
June 12, a Russian army transport helicopter crashed near Grozny, killing the crew of four.
August 6, an Mi-8 downed by ground fire, killing one airborne soldier.