Boeing Recommends Engine Start Switch Improvement

New Generation Boeing 737 airplanes

Operators around the world have reported about the poor reliability of the Engine Start Switch in the models 737-600, -700, -700c, -800, -900, -900ER, and the –BBJ Series. The current switch P/N 66—2849 is known for problem like failure to hold in the Start position, auto cutout failures and switch binding. In addition to all these failure, it has also been reported that the start switch knobs fall off during engine start process.

Boeing and Ducommun LaBarge Technologies, Inc have developed a replacement Engine start Switch as several operators reported poor reliability Engine Start Switch, P/N 6600-2849. The new Switch, P/N 530938-1 will be a direct replacement for the existing switch for all 737NG airplanes. The new switch will offer improved reliability over the existing Cole Instrument Corporation Switch. Moreover, the new switch will incorporate machined flats on the switch for improved knob retention. That means no more knob falling off during the start process.

Boeing and Ducommun LaBarge Technologies, Inc have developed a replacement Engine start Switch as several operators reported poor reliability Engine Start Switch, P/N 6600-2849. The new Switch, P/N 530938-1 will be a direct replacement for the existing switch for all 737NG airplanes. The new switch will offer improved reliability over the existing Cole Instrument Corporation Switch. Moreover, the new switch will incorporate machined flats on the switch for improved knob retention. That means no more knob falling off during the start process.

Classic 737 airplanes
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