N521AL
Operators of this aircraft
Who operated this tail, and how firmly we know it.
No operator established for this aircraft.
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
Service Difficulty Reports filed with the FAA for this airframe. Filing is largely voluntary — the number of reports is not a measure of reliability. To verify a report, search its control number at the FAA SDRS site.
6 reports on file, 2001-03-01 – 2005-06-04.
Part: AMPLIFIER — UNSERVICEABLE (FIRE CONTROL)
BEFORE ENGINE START CHECK OF THE FIRE DETECTION SYSTEM, TEST HAD NO TONE. MAINTENANCE REMOVED FIRE CONTROL AMPLIFIER SN 11595 AND INSTALLED SERVICEABLE CONTROL AMPLIFIER 2329. ALL WORK WAS DONE IAW MM. OPS CHECK WAS GOOD. (K)
Part: BELLOWS — CONTAMINATED (FUEL CONTROL)
ON TAKEOFF, THE NR 1 ENGINE STARTED TO SURGE. MAINTENANCE REMOVED FUEL CONTROL, FOUND WATER IN THE P1 BELLOWS REMOVED WATER AND REINSTALLED FUEL CONTROL, OPS CHECK WAS GOOD. (M)
Part: SENSOR — MALFUNCTIONED (NR 1 ENGINE)
DURING TAKE OFF, TWO MINUTES AFTER TAKEOFF FROM BASE, NR 1 ENGINE OVERSPEED CAUTION LIGHT FLICKERED REPEATEDLY (BRIGHT NOT DIM). AIRCRAFT WAS RETURNED TO BASE. UPON LANDING THE MECHANIC REMOVED AND REPLACED THE NR 1 ENGINE SPEED SENSOR. AIRCRAFT WAS FUNCTION CHECKED AND RETURNED TO SERVICE.
Part: SENSOR — FAILED (MAG OVERSPEED)
DURING GROUND RUN, WITH NR 1 ENGINE RUNNING AT GROUND IDLE (70 PERCENT NR1) AND ROTOR BRAKE ENGAGED, THE ENGINE SHUT ITSELF OFF AFTER RUNNING ABOUT 3-5 MINUTES. THE MECHANIC REMOVED AND REPLACED THE MAG OVERSPEED SENSOR AND THE AIRCRAFT RETURNED TO SERVICE.
Part: SENSOR — INOPERATIVE (NR 2 ENG OVRSPED)
ON TAKEOFF, NR 2 ENGINE DROPPED OFF LINE AND WOULD NOT RESTART. THE MECHANIC TROUBLESHOT AND FOUND NR 2 OVERSPEED SENSOR NOT OPERATIONAL.
Part: QUILL — DAMAGED (BLOWER DRIVE) · airframe 14,385 hrs
DURING PHASE INSPECTION, FOUR LARGE CHIPS WERE FOUND ON RIGHT HAND CHIP PLUG AND ONE LARGE CHIP ON THE LEFT HAND CHIP PLUG. THE BLOWER ASSEMBLY QUILL WAS PULLED AND TWO TEETH FOUND DAMAGED.