Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 727 airplanes. This proposed AD would require revising the Limitations section of the Airplane Flight Manual to prohibit resetting a tripped circuit breaker for a fuel pump. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prohibit the resetting of a tripped circuit breaker for a fuel pump, which could allow an electrical fault to override the protective features of the circuit breaker, and could result in sparks inside the fuel tank, ignition of fuel vapors, and consequent fire or explosion.