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A ce-560XL captain found an APU fuel leak inside the APU compartment. While investigating maintenance found a loose 'B' nut spraying fuel inside the compartment and on the APU containment box.
| Attributes | |
| ACN | 1244340 |
| Time | |
| Date | 201503 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Parked |
| Flight Plan | None |
| Component | |
| Aircraft Component | APU Fuel System |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance |
Narrative:
On taxi-in to hangar; we started the APU to provide heat for our elderly passenger once the cabin door was open. After the passengers were gone; we shut the APU back down; and the captain commenced his exterior post-flight. He opened the aft equipment bay door; and called me to come see. Jet fuel was dripping from the underside of the titanium APU containment box; and was all over the inside of the compartment door. The captain wrote it up; and maintenance worked on it overnight. Next morning; the mechanic tech told us there was a loose 'B' nut on a fuel line coupling and that fuel was spraying all over the exciter box and burner can. He couldn't believe we hadn't had a fire.if one crew has come across this twice in 3 days; then it would seem advisable for the company to inspect every aircraft of this type in the fleet for this loose nut on an expedited basis. Say; 7 days.
Original NASA ASRS Text
Title: A CE-560XL Captain found an APU fuel leak inside the APU compartment. While investigating Maintenance found a loose 'B' nut spraying fuel inside the compartment and on the APU containment box.
Narrative: On taxi-in to hangar; we started the APU to provide heat for our elderly passenger once the cabin door was open. After the passengers were gone; we shut the APU back down; and the Captain commenced his exterior post-flight. He opened the aft equipment bay door; and called me to come see. Jet fuel was dripping from the underside of the titanium APU containment box; and was all over the inside of the compartment door. The Captain wrote it up; and maintenance worked on it overnight. Next morning; the mechanic tech told us there was a loose 'B' nut on a fuel line coupling and that fuel was spraying all over the exciter box and burner can. He couldn't believe we hadn't had a fire.If one crew has come across this twice in 3 days; then it would seem advisable for the company to inspect every aircraft of this type in the fleet for this loose nut on an expedited basis. Say; 7 days.
Data retrieved from NASA's ASRS site 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.