BAe 125 Series 800
Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Human-Machine Interface; Confusion
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue; Inflight Event / Encounter Weather / Turbulence
Flight Crew Overcame Equipment Problem
Human Factors; Manuals; Weather; Aircraft
While enroute we suffered the loss of the right engine which we subsequently restarted. This was a reposition flight with no passengers onboard. The right engine boost pump had been deferred by Maintenance before departure.After spending a considerable amount of time reviewing the incident I've discovered we unintentionally misread an Aircraft Maintenance Logbook (AML) supplement related to Dispatch with a boost pump inoperative. In my case; I thought we had completed the supplement when; in fact; there was a second page that had escaped my attention. Had we accomplished the procedures on the second page it's likely that the engine failure would not have occurred. While I take full responsibility for my mistake; I'll list several things that may help to prevent a future similar incident. The company may want to consider the possibility of removing fuel boost pumps from the MEL. The procedure has obvious consequences if not done 100% correctly and will be a considerable distraction from other flying duties when in flight. In the absence of removing the procedure; any additional communication (verbally or in writing) that will draw attention to the full procedure (opening the crossfeed/transfer valve) will aid in preventing future incidents. I admit that I should have noticed the additional page but this part of the procedure did get missed by several sets of eyes both before and after the incident and may in fact not be obvious in a real world situation. Anything that draws further attention to the full and complete procedure will help prevent the same error in the future. For my part; I intend to slow down and not allow external pressures and distractions to prevent me from being more thorough in my review of MEL procedures; Airplane Flight Manual (AFM) supplements etc.
After engine start the right side fuel pressure light illuminated. We attempted cycling the fuel pump switch; but were unable to extinguish the annunciator. We consulted with Maintenance Control who ultimately deferred the right fuel pump per the AML; while Local Maintenance accomplished the associated MEL procedures.After leveling off and reducing the power to cruise setting; the right engine spooled down. We declared an emergency and accomplished the appropriate checklists. We opted to restart the engine after discussing the situation and reviewing the checklist. The engine restart was successful and the flight continued without further incident. There are several factors that affected the course of the flight. Time pressure was a large one considering the handlers were keeping the Towers of both airports open; as well as customs. The flight the next day was scheduled for [early next morning] which meant putting off the flight until the morning would have caused further scheduling issues. It had also become dark as we were addressing our problem. The weather itself was problematic as the heat and humidity made simple tasks challenging.
After deferring the boost pump for the right engine; the flight crew of a BAE-125 experienced an inflight shutdown of the engine; which they subsequently restarted. They later discovered they had been unaware of the second page of the AML deferral procedure which directed opening the crossfeed valve; which they had failed to do.