参考FIM 36-10 Task 801 Step E.(1).(c), if the BLEED TRIP OFF light came ON during a ‘no engine bleeds takeoff’, then replacing the High Stage Valve,波音建议完成健康检查后,根据结果按需更换高压机活门。
Boeing agrees that it is possible for an excessively leaking high stage valve (HSV) and/or a faulty bleed air regulator (BAR) overpressure switch to cause the BLEED TRIP OFF light during a “no engine bleeds” takeoff when the Pressure Regulator and Shutoff Valve (PRSOV) is closed. However, Boeing notes that since a pressure transducer is not available upstream of the PRSOV, we are unable to quantify how much 9th stage pressure is leaking past the HSV at this operating condition and cannot predict this valve failure mode. If the BLEED TRIP OFF light is due to HSV leakage resulting in overpressure, we would not expect it to be resettable during takeoff thrust settings. As such, we do not believe a revision to the Flight Crew Operations Manual (FCOM) procedure to avoid a rejected takeoff would be appropriate.