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An American Airlines mechanic was arrested Thursday on a sabotage charge accusing him of disabling a navigation system on a flight with 150 people aboard before it was scheduled to take off from Miami International Airport earlier this summer.

The reason, according to a criminal complaint affidavit filed in Miami federal court: Abdul-Majeed Marouf Ahmed Alani, a veteran employee, was upset over stalled union contract negotiations.

None of the passengers and crew on the flight to Nassau were injured because the tampering with the so-called air data module caused an error alert as the pilots powered up the plane’s engines on the runway July 17, according to a criminal complaint affidavit filed in Miami federal court. As a result, flight No. 2834 was aborted and taken out of service for routine maintenance at America’s hangar at MIA, which is when the tampering with the ADM system was discovered during an inspection.

An AA mechanic found a loosely connected tube in front of the nose gear underneath the cockpit that had been deliberately obstructed with some sort of hard foam material.Alani is charged with “willfully damaging, destroying or disabling an aircraft” and is expected to have his first appearance in Miami federal court on Friday.According to the complaint filed Thursday,

Alani glued the foam inside the tube leading from outside the plane to its air data module, a system that reports aircraft speed, pitch and other critical flight data. As a result, if the plane had taken off that day from MIA, the pilots would have had to operate the aircraft manually because the ADM system would not have received any computer data. After his arrest Thursday, the affidavit says that Alani told federal air marshals assigned to the FBI’s Joint Terrorism Task Force that “his intention was not to cause harm to the aircraft or its passengers.

”He said that his motive in tampering with the navigational system was because he was “upset” over stalled contract negotiations between the mechanics’ union and American Airlines that has raged for months — that “the dispute had affected him financially. ”He further said he only tampered with the plane’s air data module “in order to cause a delay or have the flight canceled in anticipation of obtaining overtime work,” according to the affidavit.

Relations have become so strained between the 12,000-employee mechanics’ union and American Airlines that the organization vowed a “bloody” battle over the course of the summer that has led to bitter legal fights in Texas, where the company is headquartered.Federal air marshals zeroed in on Alani, a longtime American Airlines mechanic, after reviewing video footage that captured him exiting a white truck on the morning of July 17 at concourse D and approaching the plane, which had just arrived from Orlando, the affidavit says.

The footage showed Alani, who walks with a limp, accessing the aircraft’s compartment where the navigational system was located in the plane, according to the affidavit, which was filed by the U.S. Attorney’s Office. Alani, the federal charges said, spent about seven minutes doing the sabotage.

The air marshals, part of the Transportation Security Administration, also conducted interviews with three other AA mechanics who were with Alani after he tampered with the plane. They helped investigators identify him from the video footage. It was not yet clear if Alani had retained an attorney.

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. . . the pilots would have had to operate the aircraft manually because the ADM system would not have received any computer data.

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