FAA has issued special airworthiness information bulletin NM-18-33, advising operators of Boeing 717-200s, 737-700s, -700Cs, -800s, -900ERs, 737-8s, -9s, 747-400s, -400Ds, -400Fs, -8s, -8Fs, 757-200s, -200CBs, -200PFs, -300s, 767-200s, -300s, -300Fs, -400ERs, -2Cs, 787-8s, -9s, 10s, MD-11s, MD-11Fs and MD-90-30s of the potential for disengagement of the fuel control switch locking feature.