Airbus A320 Center Tank Pump Pressure Instability During Climb
An Airbus A320-214 experienced intermittent center tank fuel pressure fluctuations during climb shortly after automatic fuel transfer activation. The ECAM displayed transient low-pressure indications associated with the center tank boost pump system. Maintenance troubleshooting later identified progressive internal degradation within the pump assembly resulting in unstable operational performance under electrical and thermal load conditions.
Event Summary
During climb following departure, the flight crew observed intermittent ECAM low-pressure indications associated with the center tank fuel transfer system. The indications appeared briefly and self-cleared several times during climb power stabilization. No engine performance abnormalities, fuel imbalance, or thrust fluctuations were reported during the flight.
Operational Symptoms
Post-flight maintenance review identified unstable center tank boost pump operating characteristics. Recorded symptoms included intermittent low-pressure indications, elevated electrical current consumption during pump operation, irregular vibration signatures during operational testing, and increased housing temperature after shutdown.
Maintenance Investigation
Initial troubleshooting focused on electrical supply integrity, relay operation, and fuel system monitoring logic. Voltage supply parameters remained within operational limits. Review of maintenance history identified several previous transient pressure instability events recorded during earlier flight cycles. The center tank boost pump assembly was removed for inspection. Maintenance findings identified progressive internal bearing wear, increased rotational resistance, and evidence of thermal stress affecting internal electrical components.
Root Cause Analysis
Engineering evaluation concluded that progressive internal degradation of the boost pump assembly resulted in unstable pump performance during periods of increased operational demand. Increased internal friction and thermal loading contributed to intermittent pressure instability during fuel transfer operation. The fault remained intermittent and did not progress to complete pump failure during the flight cycle.
Corrective Actions
Corrective maintenance actions included replacement of the center tank boost pump assembly, inspection of associated wiring and electrical connectors, fuel system operational testing, and verification of fuel transfer logic. Following replacement, fuel pressure indications remained stable throughout subsequent operational checks.
Engineering Lessons
The event demonstrated how intermittent fuel pressure fluctuations may provide early indication of progressive mechanical degradation inside electrically driven fuel pump assemblies. Trend monitoring of pump current consumption, thermal behavior, and recurrent transient ECAM indications can support earlier fault detection before complete component failure develops.