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A line mechanic reports their boeing B767-300 maintenance manual chapter 28-42-01 removal and installation procedure for the left aft fuel boost pump pressure switch does not reference the boost pump in the 'off' position; and no reference for the circuit breaker to be pulled and collared.
| Attributes | |
| ACN | 881429 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Fuel Booster Pump |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
A B767-300 aircraft had a repeat item of the 'pressure' light being illuminated on the left aft fuel boost pump switch. I was assigned to replace the switch. According to the removal and installation procedure in maintenance manual; the applicable boost pump is never referenced to be in the off position nor is the circuit breaker pulled and collared. The aircraft; on this day was sitting at the gate with the APU running. The APU is fed by the left aft fuel boost pump. There was a dangerous amount of fuel pressure behind this switch as I started turning it. I aborted the removal and quickly tightened the switch. After the APU was shutdown; there was minimal pressure behind the switch.
Original NASA ASRS Text
Title: A Line Mechanic reports their Boeing B767-300 Maintenance Manual Chapter 28-42-01 Removal and Installation procedure for the left aft fuel boost pump pressure switch does not reference the boost pump in the 'OFF' position; and no reference for the circuit breaker to be pulled and collared.
Narrative: A B767-300 aircraft had a repeat item of the 'Pressure' light being illuminated on the left aft fuel boost pump switch. I was assigned to replace the switch. According to the Removal and Installation procedure in Maintenance Manual; the applicable boost pump is never referenced to be in the off position nor is the circuit breaker pulled and collared. The aircraft; on this day was sitting at the gate with the APU running. The APU is fed by the left aft fuel boost pump. There was a dangerous amount of fuel pressure behind this switch as I started turning it. I aborted the removal and quickly tightened the switch. After the APU was shutdown; there was minimal pressure behind the switch.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.